flow3d泥沙模型学习.pdf

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1、NumericalStudyofErosion-proofofLooseSandinanOvertoppedPlungingScourProcess–FLOW3DInvestigators:GeWang,ChungR.Song,JinwonKimandAlexander,H.-D.ChengCivilEngineeringDepartmentUniversityofMississippi7/1/20091ObjectivesFailureoffloodwallsduringHurricaneKatrina,Scouringcausedbyover

2、toppingflow.ThisleadsAugust23,2005.NearlyeveryleveeinmetroNewtothelossoflateralsupportthatgivesrisetoOrleanswasbreached.Eventually80%ofthecityfailureoffloodwallsystemunderhydrostaticbecameflooded(http://en.wikipedia.org/wiki/Hurricane_Katrina).pressurefromtheothersideofthewal

3、l(IPET,2007).Maingoal:investigateleveebacksideerosioncausedbyovertopping,andultimatelyprovideimprovedtechnologiesforretrofittingandconstructionofthenation’shurricaneandfloodprotectionsystem.7/1/20091.FLOW3Dforascour/erosionstudyPredictthebehaviorofpacked/suspendedsedimentwit

4、honefluidmode.3dimensionalprognosticsolver.Containavarietyofoptionalturbulentmodels.Actualconditionsareeasytoapply.7/1/20093ModelintroductionModelataGlanceFluidfield∂u+•∇=−∇+∇•+uupτg−Ku∂tMeanfluidviscositydoesnotrise,rather,thesedimentparticlesbegintointeractwithonepu

5、reflowK:dragcoeff.anothertocausesolid-likebehavior.f:solidfraction.S0iffifff()fluidflowceasesSSCR,fd:dragfactor.Sedimentparticl

6、esarecompletely7/1/20094boundtogetherinasolid-likemass.(cont.)Movementofsuspendedsediment∂cs2+•∇=∇ucDcu−•∇−cu•∇cssliftsdrifts∂tuu,liftdrift:locallifting,driftingvelocity.c:localconcentration.sD:diffusioncoefficient.7/1/200952.SimulationsofFLOW3DFourcases:7/1/20096(cont.)

7、InputparametersforanerosionsimulationAverageparticlediameter:0.071cm3Densityofthesedimentparticles:2.67kgm/Criticalshieldsnumber:0.00043CriticalsedimentfractionCohesivesedimentfractionSedimentdragfactor0Angleofrepose:227/1/20097CaseA:7/1/20098CaseB:7/1/20099CaseC:7/1/

8、200910CaseD:7/1/200911Simulationsoferosiondepth/locationvs.time(A)(B