Reynolds Averaged Navier Stokes (RANS)

Reynolds Averaged Navier Stokes (RANS)V1.5Equation for ns changed(Removed date)Changes ar boldedBefore Computational Fluid Dynamics(CFD) was developed, theoretical studies on eminent swirling trammel profuse liquifys can only be validated by conducting observational studies. These experimental studies require long leading time and high cost. Now, with the help of CFD, researchers argon fitted to study these complex watercourses in a much shorter time and with a lower cost incurred.Many experimental studies have been conducted on the high swirling confined churning adverts but little has been done on the computational modelling. Most of these intricate current rate computer good examples are accomplished at the expense of high computational cost methods such as Large Eddy Simulations(LES) and Direct Numerical Simulations(DNS). Thus, a lower computational cost alternative will be in truth helpful in the studies of high swirling confined turbulent lessens.Thus, this pr oject will be using the Reynolds Averaged Navier Stokes (RANS) based turbulence models in ANSYS bland to mold the high swirling confined turbulent flows in both different test cases and the results validated with experimental data. The aims and objectives are discussed as followsAims and ObjectivesAimsTo validate the accuracy of RANS based turbulence models for the simulation of high swirling confined turbulent flows.ObjectivesTo simulate the high swirling confined turbulent flows using ANSYS FLUENT with different RANS turbulence models.To compare the numerical data from the simulations with the experimental data to validate the accuracy of the turbulence models.To understand the effect of the RANS turbulence models on the predicted results.Review of Confined Swirling FlowsConfined swirling flow plays an important role in various engineering messles. For example, they can enhance the mixing process in the stirred tanks, improve the separation of particles in cyclones 1 and also increases the flame stability in gas turbine combustors. So, what is a swirling flow?A swirling flow is a flow where a swirl stop number that exists in the tangential direction other than the flow motion in the axial and radial tire directions. The swirl velocity of the flow plays a major role in the evolution and decay process of swirling flow motion but non the radial velocity of the flow as shown in a study by Beaubert et al. 2A swirling flow consist of two types of rotational motion. A solid body rotation at the inner region near the centerline and a free vortex motion at the outer region. 14 Solid body rotation and free vortex motion respectively has its velocity directly and inversely proportional to the radius of the pipe at the centre of their axis of rotation as shown in Figure 1.Figure 1 Velocity profile of swirling flow in a pipe. 4Confined swirling flow can whence be categorized into subcritical and supercritical flows. A subcritical flow has a get up flow at the e xit and is very sensitive towards changes at the exit as shown experimentally by Escudier and Keller11. On the other hand, the supercritical flow has no reverse flow at the exit and is insensitive towards innovation at the exit.10 Subcritical flows are formed when the ratio of maximum swirl velocity to the averaged axial velocity exceeds unity was stated in a theory by Squire12.Review of Computational Fluid Dynamics(CFD)CFD is a methodology which is employed to study fluid flow using numerical analysis and algorithms to solve the governing flow equations. In the past, the handle of fluid dynamics was made up of purely experimental and theoretical studies. CFD is considered the third approach in the studies of fluid mechanics and would equilibrise the two existing methods. 5The three main elements when implementing CFD are the pre-processor, solver and post-processor. The pre-processors task is to transform the input of a flow problem into a form that is suitable for the solver. During pre-processing, the geometry of the problem is defined and the flow domain is divided into smaller cells (meshing). The physical (eg turbulence) and chemical phenomena that necessarily to be modelled are selected and the fluid properties are defined. Next, the boundary considerations are given to cells which interacts with the domain boundary. The solution to the flow problem is stored in the nodes in each(prenominal) cell. In the solver, the conservation equation containing the mass, momentum, efficiency and species is integrated over each cells. Then, the unknown variables of the equation are interpolated and substituted back into the equation. The solver then runs numerical techniques to solve the derivatives and flux in the cells. Lastly, the post-processor allows user to analyse the data obtained by plotting graphs and acknowledge the flow animation. 6Review of Turbulence FlowsAll fluids in motion are governed by the conservation of mass equation and the Navier-Sto kes equation. The latter equation relates the flow properties such as the velocity, pressure, density and temperature for a moving fluid. The conservation of mass equation and the incompressible Navier-Stokes equation (in Cartesian tensor notation) can be respectively written asTurbulence is shown to develop as an instability in the laminar flow through detailed analysis of the solutions for the Navier Stokes equation. 7.In principle, Direct Numerical Simulation(DNS) can be used to simulate very accurate turbulent flow by solving the exact equations with the appropriate boundary conditions. However, it requires very humongous amount of computational power as this method has to represent all of the eddies from the smallest scale to the largest scale and the time step chosen must be small enough to dispel the fastest fluctuations. The turbulent eddies will be discussed in more detail in the next section.The two other methods that can be used to simulate the turbulent flows (with dec reasing computational power and accuracy) would be the Large Eddy Simulation(LES) and turbulence modelling with Reynolds Averaged Navier Stokes equation (RANS). Basically, LES solves the governing equations partial(p)ly as only the large eddies are solved using the governing equations and the filtered smaller eddies are modeled while RANS models the entire turbulence eddies and only the represent variables are calculated.For turbulence modelling, the instant details of the turbulent motion are not prioritized so only the average flow properties are solved. In a turbulent flow, the velocity playing area fluctuates randomly in both space and time. Despite the fluctuations, the time averaged velocity can be pertinacious and the velocity field equation can be written as()where is the time averaged velocity and is the fluctuating component in the velocity field. Other than the velocity, other flow properties can also be decomposed into its mean and fluctuating parts. In our simula tions, the flow is assumed to be steady, have constant density and axially symmetric. Thus, the incompressible Reynolds Averaged Navier-Stokes (RANS) equations (in Cartesian tensor notation) can be written asWhere is the Reynolds Stress tensor, which is a component of a symmetric second order tensor from the averaged process. The diagonal terms are normal stresses while the non-diagonal terms are lop stresses. The Reynolds Stress can be understood as the net momentum transfer due to velocity fluctuations. This term also provided unknown terms to be equation and thus, more equations have to be found to match the number of unknowns to solve the equations.A straightforward method of generating equations would be to create new sets of partial differential equations (PDEs) for each term using the original set of Navier-Stokes equation. This can be done by multiplying the incompressible NS equations by the fluctuating property and time averaging them to produce the Reynolds-Stress equat ion. By deriving the Reynolds Stress term, we can identify what is influencing the stress term but the problem with this approach is that more unknowns and correlations were generated and no new equations are formed to trace for these unknowns. 7 Thus, these unknown terms have to be modelled to completion the equation before they can be used.Review of Turbulence EddiesThe velocity field fluctuations in the turbulence flows are actually the eddies in the flow. The eddies moving pass an object generates the turbulence energizing energy and the length scale of the eddies, are determined by the diameter of the object. As the large feed break down into smaller eddies, the turbulence kinetic energy will be passed down and lastly dissipated due to viscous forces in the flow. Thus, according to the Kolmogrov scales, the length and time scale of the smallest eddies depends on the rate they receive energy from the larger eddies, and the kinematic viscosity,. It is also famous that the ra te of turbulence energy received is equal to the rate of turbulence energy dissipated so, . The Kolmogrov scales shows the length and time scale of the smallest eddies to be and respectively. 8 These expressions can then be used to determine the length and time scale ratio between the small and large eddies.()()From the equations above, we can conclude that the large eddies are some(prenominal) orders of magnitude larger than the small eddies. Thus, even at a low Reynolds number, the time and length ratio between the small and large eddies are meaning(a) enough to affect the number of elements and time step needed to model the entire turbulent flow. Therefore, instead of solving all the eddies, turbulence modelling is required to reduce the amount of computational cost of CFD.SummaryThe understanding of the motions of confined swirling flows and characteristic of the subcritical and supercritical flows will be useful when explaining the simulation results. Before the simulatio n results are obtained, it is also important to identify the basic steps of running any CFD simulations which are the preprocessing, solving and post processing.DNS solves the exact NS equation while LES solves the equation for larger eddies and models the smaller eddies. The process of solving the exact equations takes up a lot of computational power as it would need to represent the all the turbulent eddies involved and a suitable time step has to be chosen to resolve the fluctuations. When compared to DNS and LES, RANS turbulence modelling requires the least computational power as it does not solve the exact NS equations but instead, models the entire turbulence eddy and only solves the mean average variables. The low computational cost of RANS turbulence modeling is the master(a) reason why this project has chosen it to simulate the confined swirling flows. However, the accuracy of this methods requires validation, which is the aim of this project.The RANS turbulence models cre ated will be based on the PDEs of the Reynolds stress as a guideline as it shows how the Reynold stress behave. Thus, the next section will elaborate more about the RANS turbulence models that will be implemented in this project.The main objective of the RAN based turbulence models are to model the (Reynolds Stress tensor) and provide closure to the RANS equation. The three main categories of the turbulence models are linear eddy viscosity models, non-linear viscosity models and Reynolds Stress Model(RSM). 9There are three types of linear eddy viscosity models algebraical models, one equation models and two equation models. They are based on the Boussinesq hypothesis which models the Reynolds stress tensor to be proportional to the mean rate of strain tensor, by a coefficient named the eddy viscosity,. This infers that the turbulence flow field acts similarly to a laminar flow field. 10(5)The second term of the right hand side of the equation above is required when solving turbulen ce models that needs to calculate the turbulent kinetic energy, k from the transport equations. The equation for k is half the trace of the Reynolds Stress tensor.For the algebraic turbulence models, no additional PDE equations are created to describe the transport of the turbulent flux and the solutions are calculated directly from the flow variables. An algebraic relation is used as closure based on the mixing length theory. The mixing length theory states that the eddy viscosity have to vary with the distance from the wall. However, the problem with these equations are that they do not account for the effects of turbulence history. In order to improve the turbulent flow predictions, an additional transport equation for k is solved which will replace the velocity scale and include the effects of turbulence flow history.For one and two-equation models, the modeled k equation is involved thus discussion on the exact k equation will scratch be done. The exact k equation is a PDE der ived by multiplying the incompressible NS equations with , averaging it and multiply with . The exact k PDE equation obtained isThe left wing hand side(LHS) terms are the material derivative of k which gives the rate of change of turbulent kinetic energy. The first term on the right hand side(RHS) is the production term and represents the turbulent kinetic energy that an eddy will gain due to the mean flow strain rate. The second term on the RHS represents the dissolving term which meant the rate at which the kinetic energy of the smallest turbulent eddy being transferred into thermal energy due to the work done by the fluctuating strain rate against the fluctuating viscous stresses. The third term on the RHS is the diffusion term which represents the diffusion of turbulent energy by molecular motion. The last term of the RHS is the pressure-strain term which signifies the tendency to redistribute the kinetic energy in the flow due to the turbulent and pressure fluctuations. In o rder to close and solve the k equation, the Reynolds Stress, dissipation, diffusion and pressure-strain term has to be specified.For the Reynolds Stress term, it is already mentioned at the beginning that it is based on the Boussinesq hypothesis. The eddy viscosity, is modelled similarly to how it was done for the algebraic modelsWhere is a constant, the length scale of turbulence eddies, is similar the mixing length and velocity scale of the turbulence eddies is replaced by the square root of the turbulence kinetic energy, k. The equation above is an isotropic relation which means that it is assumed that the momentum transport is the same in all direction at any point.Next, the dissipation term is modelled based on the assumption that the rate of turbulence energy received is equal to the rate of turbulence energy dissipated. Thus, we can write the equationand since the equation is homogenous, it can be characterized by the length and velocity scale of turbulence eddies givingWhe re is a constant.For the diffusion and pressure-strain term, the sum is modelled based on the gradient diffusion transport mechanism as there is the pressure-strain term is small for incompressible flows. The gradient transport mechanism implies that there is a flux of k down the gradient. It is to help ensure that the solutions are smooth and a boundary condition can be applied on k when k is in the boundary. There is no Therefore, the equation showsWhere is the turbulent Prandtl number and is normally equal to one.-not completed will talk about the modeled turbulent kinetic energy in one equation spalart allmaras-will talk about dissipation part for 2 equation model in k-eThis test case is chosen because the flow was mapped and documented in detail as So et al was able to measure and document the flow in detail using a laser Doppler Velocimetry(LDV) at 10 axial stations up to 40d downstream. Thus, the validation of the accuracy of the RANS turbulence models on confined high swi rling flow can be done.verbal description of Test CaseThe flow consists of an annular high swirling stream projected into a pipe of uniform radius, R = 62.5mm with a central non-swirling jet of diameter, d = 8.7mm. The swirl number, S of the flow is calculated withWhere U is the axial velocity and W is the swirl velocity. The swirl number just downstream of the swirl author is approximately 2.25 which indicates that it is a high swirling flow and will cause an adverse pressure gradient at the centreline. The purpose of the non-swirling jet was to delay the occurrence of reverse flow due to the adverse pressure gradient along the centreline from 12d to 40d downstream from the inlet.Geometry (Computational Domain)The confined swirling flow in this case is a subcitical flow according to the bump of thumb of Squire mentioned in Section x. Thus, two different computational domains were used for the simulation of the flow to check if the exit geometry will affect the swirling flow simula ted.Figure 2 (temporary figure)The first computational domain is the complete geometry of the pipe which consist of the computational inlet at x/d =1 and the coarctation of 0.75R from x/d = 70 to the computational outlet at x/d = 90. The second computational domain is a cut off from the first domain at x/d = 55 where the constriction is removed.Meshing-have not completed it. Will be updated in the next revision.Boundary Conditions doorwayThe inlet experimental measurements for the axial and tangential velocity and stresses are provided. However, the radial velocity component was not measured and is set to 0 rad/s. The radial stress is also not measured and was set equal to the tangential stress, whereas the three shear stresses are assumed to be zero. graphs of prescribed to be added electrical outletConditions at the outlet are not known prior to solving the flow problem. No conditions are defined at the outflow boundaries as ANSYS FLUENT will extrapolate the required information from the interior. It is assumed that the flow is fully developed at the exit end thus the outflow boundary condition is used. (dphi/dxexit = 0)WallThe no slip condition is applied.

Construction Method Statement Example

Construction Method Statement Example1.0 IntroductionThis Construction Method Statement describes the development of sextet houses in three identical semi-detached blocks on a plot of land. The document forget suffice for the majority of works under scoop outn during the construction but leave behind ingest alterations or additions for certain go fors. This method statement is a qualified assessment based on current information and is subject to refinement as the project evolves. This method statement is prep atomic number 18d to discuss just about all the construction process and operations and also emphasizing on the health, s entryway duty and environmental concerns.2.0 advance Works2.1 Access and Material DistributionConstant flow of transport is needed during the construction period. Small access roadstead and driveways together with temporary roads are constructed to define come in circulation routes and provide a suitable surface for plant movement (Chudley Greeno, 2 008, p.118). A small access road is set up nearby the storage land of the post to transport materials that are needful within a short space of time. A forklift will be apply for material offloading and distribution around the localize. The fix of the access road shows in the Figure 1 send layout plan. Moreover, the road will be subjected to light and sarcoid day to day traffic such as concrete delivery, steel delivery lorries, brick and block delivery lorries and delivery vehicles generally. All the deliveries will be fitted into a delivery schedule system which is controlled by site personnel under guidance of Construction Manager. (Griffith Watson, 2004, p.392) Materials are closely phased and delivered when assembled which to achieve just-in-time management in this project. Materials that are transported with heavy goods vehicles (HGVs) are expected to take place at nighttime and that certain works may have to be undertaken during this period so that it does non cause disruption to traffic flows, especially at peak times.2.2 StorageStorage on site is erected to store materials, tools and equipments, spare parts for mechanical plant, and exculpate goods for incorporation in the work. (Griffith Watson, 2004, p.188) The distance between storage and activity areas keeps short to reduce transportation needs in terms of time. Timber and steel financial support will be stored in a dry safe place and special store for fuel oils needed by the requirement of legislation. (Griffith Watson, 2004, p.189)2.3 Site propertyA temporary site office will be provided on the site for management purposes and paperwork. These offices will be housed in modular portable units. The size of site office will be calculated based on an example belowSize ExampleOffice for site agent and companion plus an allowance for 3 visitors. Assume an internal average point of 2.400. Allow 3.7m2 minimum per person and 11.5m3 minimum per person.Minimum area = 5 x 3.7 = 18.5m2Minim um volume = 5x 11.5 = 57.5m3Assume office width of 3.000 then minimum length required is= 57.5/ (32.4) = 57.5/7.2 = 7.986 say 8.000Area check 38 = 24m2 which is 18.5m2 satisfactory (Chudley Greeno, 2008, p.94)2.4 familiar Site FacilitiesGeneral site facilities such as toilets, changing facilities, canteen, as well as shelter from inclement weather will be provided on site. Adequate heating, lighting and ventilation are required in all toilet, washing, changing, and accommodation. The requirements of each facilities are specified the Health and Safety Executive (HSE) legislation (Griffith Watson, 2004, p.192). The location of all the facilities moldiness be close together for easy access. The site accommodation will be located in the north corner of the site so to suit site access strategy. A row of single storey accommodation will be needed in the project. All the facilities habitusings build in portable.2.5 Site Enclosure Fencing and HoardingA minimum height of 2.4m hoarding and fencing will be erected around the perimeter of the site for protection (Griffith Howarth, 2001, p.252). Safety measures outlined by the Albert Building Code (ABC) must be followed. An external signposting will be installed around the hoarding to enable the site to be more visible. Caution signs will also be displayed on fences and gates so that people will be aware when passing with the site. There will be a principle gate to the site along with pedestrian gates for access.2.6 Safety and SecurityFor both security and safety reasons, site-bases security presence will be provided during normal working hours with a visiting patrol covering nights and weekends to protect against theft and vandals of storage. Site-based security presence with a full 24 hours will be in place during the later stages of the construction works and fit out prior to occupation (Griffith Watson, 2004, p.391). All entry points will be clearly signed with appropriate warning notice. Flood lightings with 500 watts in 7.50m high are installed as a measure of night security. (Chudley Greeno, 2008, p.91)Main Construction Work3.1 SubstructureConcrete strip stern will be used as the foundation of the houses. Foundation works take excavating, earthwork support, concreting and bricklaying of the strip foundation. Trenches are excavated under the line of the walls and the soil at the bottom of the trenches is compacted. Rough sawn timber as strutting will be temporary support for the sides of gibe for strip foundation. At least 150mm of concrete is placed at the foot of the trench with a concrete pump and brick walls are then built up to the damp cogent evidence course (DPC) which will be at least 150mm above ground level. The DPC is bonkded on a layer of mortar on each leaf of brick or block cavity foundation wall. (Osbourn Greeno, 1997, p.199) The depth of the strip foundation of 1m 1.2m is adequate to ensure the soil acting as the pictorial foundation cannot be affected by the w eather and stake will be used to determine depth of concrete foundation (Osbourn Greeno, 1997, p.181 186). The strip foundation make of a continuous strip of concrete with 136 mix. Hardcore will be compacted using a vibrating plate or roller and the top of the hardcore is kept below the substructure block work so that the slab can be cast inside the walls. Concrete is protect with a sheet of hessian or sand in cold weather and sheet of polythene in hot weather. (Marshall Worthing, 2000, p.57) The provision of damp proof membrane (DPM) for the entire area on top is between the over site concrete slab and it will be done on a bed of sand or ash of 12mm thickness.3.2 Superstructure3.2.1 External WallCavity wall will be used in this project as it has good thermal insulation and weather resistance properties. Cement-lime mortar mixes is used to ensure adequate bond of ties to wall. An adequate size of vertical spacing will be required for door and windows opening.3.2.2 ScaffoldingIn M itchells Intro to Building (Osbourn Greeno, 1997, p.207) states that, As the work progress beyond a height where it is unreasonable for the bricklayer to lift materials from ground level, it will be necessary to erect scaffolding to support raised working platform.The scaffolding with aluminum alloy which connected by special fitting or couplings will be used to lay the upper floor wall.3.2.3 Doors and WindowsTemporary props will be erected until lintel construction has been complete. To connect the opening frames with the wall, rigid-angled galvanized diffused steel lugs screwed to their side edges as the work proceeds. (Osbourn Greeno, 1997, p.203) DPC will be bedded when the work is carried out.3.2.4 Internal WallWork sequence will be convertible to external wall but the internal wall is in single leaf. The partition wall will be positioned and used to separate spaces within the create into dwell. Insulated plasterboard will be installed through the wall to gain thermal for the building. (EDP Energy, 2010)3.2.5 RoofPitch roof which erected by timber trussed rafters space about 600mm at close centres to provide direct support for roof cladding and roof. (Osbourn Greeno, 1997, p.221) Install the ridge board on 2 end posts with temporary impertinent and set it straight and level. Each rafters is nailed to the wall-plate which ready placed on a mortar bed on top of cavity block wall. (Osbourn Greeno, 1997, p.221) Prefabricated ladder fit(p) to the end trussed rafter. Fascia board fixed to the feet of rafter and barge board to the outer face of gable ladder. (Marshall Worthing, 2006 p.94) Install collar ties, purlin and bracing as needed for the rafters and ridge to prevent sagging over time. Timber trusses with bracing are manufactured off-site. Clay tiles will be laid in interminably on the timber battens on sarking felt with 45 degree sloping of pitched roof.Finishes3.3.1 Internal Wall FinishesPlaster board will be utilize to internal wall as fin ishes with sozzled plaster method. Half-hour fire resistance will be provided when 5mm coat of wet plaster and 9.5mm thickness wet plaster applied on both sides of partition wall. A gap which is used to provide additional air passage is left between the approve of plaster board and the face of the wall. Then the gap will be connected to the cavity to the internal environment to allow air leakage. (Emmitt Gorse, 2005, p.535) Emulsion cay with Water Based Paints Timber will be painted through the wall using the roller method. (Chudley Greeno, 2008, p.669)Skirting board with 19mm thickness will be nailed to the concrete fixing blocks at the base of walls after plastering is completed. (Emmitt Gorse, 2005, p.548-549)3.3.2 Floor FinishesSkim coats with mix of cement and water applied with a steel float to make smooth finish on screed to allow carpet laid on it as floor finishes. Tackless strip placed around the entire perimeter rooms and shoot masonry screws into the strip and cut the strip by tin snip. Underlayment will be pour to hold the carpet padding. (Beach,1999-2010)3.3.3 Ceiling FinishesPlasterboard ceiling made with a core of gypsum sandwiched between face sheets of strong durable paper with 2.4 x 1.2 x 9.5 mm thick at centres and it fixed to joist by nailing. Then, 5mm single coat board finish plaster over bonding grade undercoat. (Chudley Greeno, 2008, p.664)3.4 Existing ServicesExisting services drawings will be obtained for the site area, which are applicable to the complete development and must be referred to at all times. Prior to any mechanical excavation commencing, each suspect area will be hand dug to confirm the depth and location of any service and clearly marked on the surface. Extreme care will be taken when planning to work in these vicinities i.e. double check with CAT and Genny and follow above procedures. (Marriott 2009)4.0 Health and Safety4.1 Significant findHazardMoving plant or vehicles run a riskOperative have to be trained a nd competent to operate the plant or equipment. They should understand the emergency and voidance procedures. ( Prifysgol Bangor University, 2001-2010) operate on treasureIsolating workers or pedestrians from the moving plant. (Department of Labour, 2007)Maintenance and servicing of plant. (Department of Labour, 2007)Operator must follow all the directions in the hazard management. (Department of Labour, 2007)Hazard go of materialsRiskMaterials fall as bricks or steel through hole or gap will cause injury people working below.Control MeasureKeeping working platforms clear of loose materials.Provide a way of preventing materials or other objects rolling, or being kicked, off the edges of platforms by with toe boards, solid barriers, brick guards etc at open edges. ( Prifysgol Bangor University, 2001-2010)HazardSafe working platformFree of openings and traps through which peoples feet could get caught, causing them to trip, fall or be injured. ( Prifysgol Bangor University, 2001-20 10)RiskRisk of fire may be occurred.Control MeasureGood housekeeping with keeping the workplace cleans all the time. ( Prifysgol Bangor University, 2001-2010)HazardWork at heightRiskAccident as falling from height during laying brick or block at height level and also cladding and roofing.Control MeasureTemporary scaffolding will be used during the height risk works.Assess weather condition before working at high take place.4.2 Personal Protective EquipmentPersonal Protective Equipment (PPE) is an effective method of controlling occupational hazard. Operatives have to wear safety helmet at all times on site. Besides, suitable safety footwear such as steel-toe-capped boots will be worn by all company personnel. Casual shoes and trainers will not be permitted. All personnel are required to wear high visibility jacket or clothing at all times. This clothing must be suitable for the working environment and prevailing weather conditions. Eye goggles, hearing and respiratory protection and protective clothing will be made available for use where required and according to on site conditions. Furthermore, gloves have to be worn all the time can trap hazardous chemic against skin.5.0 potence Environment impingementA review of the potential environment impacts associated with construction works are being considered. Below is a table of the several(predicate) environment ImpactsIssueWater befoulmentPotential ImpactRun-off from plant or vehicle washing.IssueMaterial spill to drains and watercourses.Potential Impact behave of contaminated water.IssueGround pollutionPotential ImpactDisturbing contaminated ground.IssueWind blow contamination.Potential ImpactExisting contamination of site.IssueSpillage and leakage of hazardous substances.Potential ImpactNoise and vibration contaminationIssueIncreased road noise levels from vehicles.Potential ImpactParticular methods of construction or use of heavy plant, equipment and haulage.IssueTrafficPotential ImpactTraffic congestion caused by site.IssueIncreased vehicle movements mainly consisting of heavy goods vehicles.Potential ImpactTransfer materials from vehicles into public road as main road.Issue breakage from abnormal or hazardous loads.Potential ImpactExhaust emissions cause air pollution.IssuePlant and wildlife contaminationPotential ImpactHabitat disruption or destructionIssueDisruption to wildlife activityPotential ImpactChanges to natural environments ( noise, dust, light )IssueDisruption to food or water sources.Potential ImpactHistoric/archaeological contaminationIssueDisruption or destruction of natural featuresPotential ImpactDisruption by temporary works like access road put back 1 Potential Environment Impact

Bridge On The River Kwai by Pierre Boulle Essay -- Bridge River Kwai

Bridge On The River Kwai by Pierre boulle The title of my book was Bridge on the river Kwai. The Bridge on the River Kwai is an epic tale of the struggle of British POWs in a Japanese prison house camp during WW II. Lt. Colonel marches his men into Prisoner of War Camp 16, commanded by Colonel Saito As the troops enter the camp, they are observed by long cartridge holder captive Shears, an American sailor, who has bribed a guard to be put on the sick list. Saito announces that their job will be to build a bridge over the River Kwai so that the railroad connection can be completed. However, Saito also demands that all men, including officers, will do manual labor. This act forces Nicholson to inform Saito that, under the geneva Convention, officers can not be required to do hard work. Saito expects them to do as their told because they are his prisoners after all. A standoff occurs when Nicholson adamantly refuses to make his officers do manual labor. The battalion is marched off to work with the officers left being shot by a machine-gun. Because of Nicholsons unwillingness to back down, he and his officers are placed in the ovens- small, iron boxes sitting in the heat of day. Time passes with Nicholson slowly dies, while the enlisted men labor away at the bridge. Shears, along with two British soldiers, prove to escape but only Shears is able to get away, having been thought drowned in the river. finally, Sait...

The Woman in Black Review Essay -- Drama

The Woman in Black ReviewUpon the arrival in London my anticipation was high. My firstimpression of the Fortune Theatre was it was a real old(a) Victorianbuilding, very small and slightly ragged. Upon entering it felt verycramped and made you feel claustrophobic. The atmosphere was eerie dueto the old style of the building. This was particularly effective asthe forgather was set in the Victorian period. This made you feel as if youwere in the past. excessively the narrow stairway and small seating areacreated effect. Before the move starts there is no bumground musicplayed to set a scene or consider in the audiences mind. The play startswithout warning and lights go down and we are straight into the story.The play is set in a theatre and the audience see the actorsrehearsing a manuscript to an empty crowd. At first the older actorwas reading his story as if he was an appalling actor. This technique substance abused was effective and gave rough comic relief at the start of the play. He mumbled his words without emotion which was in total contrastto the younger actor. The younger actor was very announce andpronounced his words properly, both characters spoke with poshaccents. By doing this it lulled the audience in to an al around falsesense of security. Fans blew into the theatre to make the ambience gelid and chilling.Diagram of the StageThe audience were seated in front of the stage. This was so the wholeaudience would all see the play in the same way. Also this wouldensure the woman in black wouldnt be able to be spotted. The set wasopen and most things on the stage were shown. There was a clothes rackwhich was covered, a wicker basket which was closed and some metalbuckets. There was a door which was shut but we did not cognise to whereit would lead. However during the play we discovered a whole newdimension to the stage. Behind a gauze there was another part of thestage. If this had been shown some of the fictive element would havebeen lost as we wouldnt be surprised to see it. Also the fact theonly time the audience saw the back of the stage was when the actorsthemselves were present there. This would link the audience to theactor and heighten the personal bond.Spotlights were used a lot in this production. It persuaded theaudience to focus on iodine area of the stage. It also gave a creepyeffect, as you c... ... something bad to happen. After theloud, unexpected sounds there were many long pauses, which added tothe sinister atmosphere. In my opinion this was the most effective useof sound.By the end of the play there was still a disturbing ambience as Iwalked away. I had thoroughly enjoyed the play and was suitablyscared. Any more and I may not have been able to sleep. I took awaymany aspects of acting, which could be useful in the future. The useof silence and torches in the darkness were some of my favourites. Theplay was enjoyable and funny but also terrorizing. One of the mostamusing parts was the dog bird of passag e scene. This was hard to act as theywere pretending there was a dog but it was done with the utmost ease.It was funny how the older man kicked the dog byword it does what Isay. If I was a critic for a magazine my short caption would readThe Woman in Black is a play with a distressing plot, of ghastlyghostly terror. Set in the Victorian times it sends a feeling ofemptiness and solitude through you, nevertheless an overt firstchoice for taking the young ones to see, to appreciate and learn fromthe immaculate actors and use of stage crew

Myopia Development in Infants :: Vision Sight Nearsightedness Disorders Essays

Myopia Development in InfantsAn impairment in visual sense can lead to a very challenging life. Many Americans suffer from abnormalities in their vision. They suffer with diseases such as glaucoma, hyperopia, and myopia. Myopia, or effectivesightedness, is fairly prevalent in the United States of America. In fact, it is estimated that twenty-five percent of the population of the United States is nearsighted (Kolata, 1985). Myopia occurs when the resting eye becomes focused on distant objects. The lens of the eye moldiness become thicker and the radius of curvature must be increased in order for the eye to look at nearby objects. In individuals with myopia, the eyes ar excessively long. This gets the image to form in front of the retina as opposed to on it (Kolata, 1985). Myopia frequently results from excessive postnatal eye growth. Typically, it develops in the premature school years however, some cases do not develop until early adulthood (Quinn, Shin, Maguire, & Stone, 1999) .Myopia is a very serious disease that can contain a tremendous effect on the life of a child. Approximately 5.6% of blindness among American school children can be attributed to myopia. Furthermore, it predisposes individuals to retinal detachment, retinal degeneration, and glaucoma (Quinn et. al., 1999).The cause of myopia has not yet been determined. However, children of p arents with myopia tend to develop myopia more frequently than children with nonmyopic parents (young et.al., 1998a). The two highest factors that contribute to myopia are myopic parents and doing near work. Other indications for the development of myopia include childhood illnesses, low birth weight, and nearsighted siblings (Review of Optometry, 1999).Since a definite cause for myopia has not been determined, researches are divided as to whether the disease is caused by genetic factors or environmental factors. The debate for the genetic conjecture begins with the thought that myopia may be collect to a do minant gene that is inherited by the child from the parent (Young et.al., 1998a). There is evidence to suggest that genetic heterogeneity attributes to high myopia ( Young et.al., 1998b). This implies that the child who inherits diversified genes from his or her parents is more likely to develop myopia. However, it is also thought that myopia may be caused by influences from the nervous system that are not normal and have a negative impact on the developing eye. Thus, it may, as well, be genetically determined (Kolata, 1985). The basis for the genetic theory is supported by the fact that myopia tends to run in families.

The Hawk Essay -- English Literature Essays

The Hawk EssayTed Hughes and Robbin Jeffers offer many similarities and differences in their poems slightly vends. Although written apply contrasting styles, the poems share numerous opinions and themes. These ideas include cause against weakness, arrogance, and exul enlaceion of hawks as gods chosen ruler. Yet, Hughes and Jeffers show different attitudes towards hawks, one acting as a dictator of Creation, and the other as a defeated, but still respectable bird. The issue of power versus weakness is transmitted potently in some(prenominal) poems. In Hawk remaining, the hawks image is captured in an authoritative tone, especially by the enhancement of first person view. The hawks supremacy and power is high-pitchedlighted in the poem by describing its supreme po razzion above all in almost all aspects of its life. I sit in the aggrandizement of the wood, my eyes closed conveys a sniff out of forceful peace, as if the hawk knows it holds so much power that it is fearless and can roost confidently without creation attacked. To sit in the top of the wood too demonstrates a noble rank, resembling the king in the human royal monarchy. The line I kill where I please because it is all mine emphasises the power the hawk believes he holds, as if he has ownership over Creation. Meanwhile, all other creations do by God are symbols of inferiority, acting to serve the hawk and die when he chooses for them to die. For example, Now I hold Creation in my foot suggests tat he holds the trees limbs, a foundation of life, under his grasp. The manner in which he dictates the maintenance of law under his reign as seen in My eyes has permitted no change. I am going to keep things like this also conveys the idea that the hawk alone can overcome any other force. Similarly, Hurt Hawks also creates the issue of power against weakness. Despite the fact that the hawks wing is injured and cannot fly, cat nor coyote volition shorten the week of waiting for death. This illu strates how high the hawk is in the food chain and how domineering he is in nature. At distance no one but death the redeemer will humble that interrogation emphasises again that the hawk rules the land, and nothing but death will claim him. In the final lines but what soared the fierce rush the nighttime V herons by the flooded river cried fear at its rising shows the everlasting power of the hawk. Despite the loss of its... ...k, results in a highly negative image. For example, in that respect is no mundaneness in my body. My manners are tearing off heads V the allotment of death conveys a tone of malice and savageness. Thus the idea of hawk is critical. On the other hand, Jeffers admires the courage of the hawk in his poem. He describes the submission in the bird, and the agony if experiences since it is physically stronger than other creatures but is now powerless. in that location is a sense of pity and sympathy as Jeffers describes the internal strength the hawk tries to maintain. Admiration is depicted in Beautiful and wild, the hawk, and men that are dying, call in him, where he suggests that counterbalance men pay respect to the boldness the hawk possesses. These contrasting concepts of criticism ad admiration are responsible for the difference of ideas evince in the both poems. Through analysing the poems in terms of these subjects, attitudes and themes, similarities and differences can be made. Whilst the idea of power against weakness, arrogance and exultation of hawks role in creation is back up by both Hughes and Jeffers poems, the impressions of criticism and respect towards the eagles are contrasting. The Hawk Essay -- English Literature EssaysThe Hawk EssayTed Hughes and Robbin Jeffers offer many similarities and differences in their poems about hawks. Although written using contrasting styles, the poems share numerous ideas and themes. These ideas include power against weakness, arrogance, and exultation of hawks as Gods chosen ruler. Yet, Hughes and Jeffers show different attitudes towards hawks, one acting as a dictator of Creation, and the other as a defeated, but still respectable bird. The issue of power versus weakness is transmitted strongly in both poems. In Hawk roosting, the hawks image is captured in an authoritative tone, especially by the enhancement of first person view. The hawks domination and power is highlighted in the poem by describing its supreme position above all in almost all aspects of its life. I sit in the top of the wood, my eyes closed conveys a sense of forceful peace, as if the hawk knows it holds so much power that it is fearless and can roost confidently without being attacked. To sit in the top of the wood also demonstrates a noble rank, resembling the king in the human royal monarchy. The line I kill where I please because it is all mine emphasises the power the hawk believes he holds, as if he has ownership over Creation. Meanwhile, all other creations made by God are symbols of inferiority, acting to serve the hawk and die when he chooses for them to die. For example, Now I hold Creation in my foot suggests tat he holds the trees limbs, a foundation of life, under his grasp. The manner in which he dictates the maintenance of law under his reign as seen in My eyes has permitted no change. I am going to keep things like this also conveys the idea that the hawk alone can overcome any other force. Similarly, Hurt Hawks also creates the issue of power against weakness. Despite the fact that the hawks wing is injured and cannot fly, cat nor coyote will shorten the week of waiting for death. This illustrates how high the hawk is in the food chain and how domineering he is in nature. At distance no one but death the redeemer will humble that head emphasises again that the hawk rules the land, and nothing but death will claim him. In the final lines but what soared the fierce rush the night V herons by the flooded river cried fear at its risin g shows the everlasting power of the hawk. Despite the loss of its... ...k, results in a highly negative image. For example, there is no sophistry in my body. My manners are tearing off heads V the allotment of death conveys a tone of malice and savageness. Thus the idea of hawk is critical. On the other hand, Jeffers admires the courage of the hawk in his poem. He describes the submission in the bird, and the agony if experiences since it is physically stronger than other creatures but is now powerless. There is a sense of pity and sympathy as Jeffers describes the internal strength the hawk tries to maintain. Admiration is depicted in Beautiful and wild, the hawk, and men that are dying, remember him, where he suggests that even men pay respect to the boldness the hawk possesses. These contrasting concepts of criticism ad admiration are responsible for the difference of ideas expressed in the two poems. Through analysing the poems in terms of these subjects, attitudes and themes, similarities and differences can be made. Whilst the idea of power against weakness, arrogance and exultation of hawks role in creation is supported by both Hughes and Jeffers poems, the impressions of criticism and respect towards the eagles are contrasting.

Islands As A Narration Of A Yo :: essays research papers

A. Hemons Islands is the narrative of a young boys initiation into the adult world. The boy travels to a place he has neer been before, far away from all thecomforts of his childhood home. The island is full of secrets about the adult world andthe terrible things t assume put up happen within it. While away, he learns shocking lessonsabout the world in which he lives, mainly from his Uncle Julius, who tells scary storiesthat he thinks the boy should know about. The boy is vulnerable from everything onthe island and everything it contains. Through this unprotected environment, he learnsthings about the adult world that are not learned anywhere else.In the car on the way to the coast, the boy almost loses his phonation by singingcommunist songs the entire journey. (129) By his singing songs about mournfulmothers looking through graves for their dead sons and the revolution the boydemonstrates his naivity. He is, after all, just a young boy. His limited life experience isshown in his singing such songs, without understanding the full meanings andconnotations that those songs carry. The boys innocence is emphasized here, as theseare adult songs and it is only, generally, children who sing on car journeys until theirvoices are gone. Even before boarding the boat, the boy begins to notice how ugly age and adulthood can be. He notices the gnarled knees , the spreading sweat stains on theirshirts and sagging wrinkles of fat on their thighs. (129) At one point, he sees one ofthe Germans, an old, bony man have got down on his knees and hence vomit over the pieredge. The boy sees this, but still relates it back to something he understands. The vomit Catherine Hendersonhit the surface and then dispersed in different directions, like children running away tohide from the seeker. (130) Again, by relating something so grotesque to something sochildlike and innocent, the boy reminds the reader that he is still just a young child, notyet ready to deal with this kind of adult vision.Once boarded on the boat and sailing to Mljet, the boy loses his hat. It is not justa hat though, it is his hat that shielded him from the grown-ups and the adult way of life. If he wanted to look at them properly, he had to raise his head. The hat was around straw hat with all the seven dwarfs painted on it. (129) When the gust of