简介：Inthisstudy,amulti-relaxationtimelatticeBoltzmannmodelforshallowwaterinacurvilinearcoordinategridisdevelopedusingthegeneralizedformoftheinterpolationsupplementedlatticeBoltzmannmethod.TheTaylor-Coletteflowtestsshowthattheproposedmodelenjoysasecondorderaccuracyinspace.Theproposedmodelisappliedtothreetypesofmeanderingchannelswith180°,90°and60°consecutivebends.Thenumericalresultsdemonstratethatthesimulatedresultsagreewellwithpreviouscomputationalandexperimentaldata.Inaddition,themodelcanachievetheacceptableaccuracyintermsofthewaterdepthandthedepth-averagedvelocitiesforshallowwaterflowsincurvedandmeanderingchannelsoverawiderangeofbendangles.

简介：Aquaticvegetationhasasignificantimpactonwatercurrents.Toevaluatetheeffectsofchangesintheaquaticvegetationonwatercurrentsofdifferentvelocity,a3-Dhydrodynamicmodelwasthendevelopedbytakingintoconsiderationoftheadditionalhydraulicresistanceoftheaquaticplants.TheNavier-StokesequationswerethensolvedusingtheSIMPLEmethodandthek-εturbulencemodel.CalculationsusingtheestablishedmodelswereusedtoforecasttheverticaldistributionofthehorizontalvelocityandhorizontalflowunderthetransmissionconditionsoftheSouth-NorthWaterDiversionintheNansiLake.Andcomparativecalculationfortheflowvelocitywasalsoperformedusingthesimplifiedmethodofassigningahighroughnesscoefficienttothelakebedinthesamearea.Resultssuggestthataddingadditionalhydraulicresistanceoftheaquaticplantsisfeasible.Thecalculationerrorsbetweensimulationresultandthefieldobserveddataaresmallerthan15%,while,thoseerrorsareupto35%iftheinfluenceofaquaticvegetationisdealtwiththesimplifiedmethod.

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简介：Whenabodynavigateswithcavityinshallowwater,bothflexiblefreesurfaceandrigidbottomwallwillproducegreatinfluencesonthecavityshapeandhydrodynamicperformances,andfurtheraffectthemotionattitudeandstabilityofthebody.Inthepresentwork,characteristicsofthenaturalcavitatingflowarounda2-Dsymmetricalwedgeinshallowwaterwereinvestigatedandtheinfluencesoftwotypeboundariesontheflowpatternwereanalyzed.TheVolumeOfFluid(VOF)multiphaseflowmethodwhichissuitableforfreesurfaceproblemswasutilized,coupledwithanaturalcavitationmodeltodealwiththemass-transferprocessbetweenliquidandvaporphases.Withintherangeofthecavitationnumberforcomputation(0.07-1.81),thecavityconfigurationswouldbedividedintothreetypes,viz.,stabletype,transitiontypeandwake-vortextype.Inthisarticle,theshapesofthefreesurfaceandthecavitysurface,andthehydrodynamicperformanceofthewedgewerediscussedundertheconditionsofrelativelysmallcavitationnumber(<0.256).Thepresentnumericalcavitylengthsgenerallyaccordwithexperimentaldata.Whenthecavitationnumberwasdecreased,thecavitywasfoundtobecomelongerandthicker,andthescopeofthedeformationofthefreesurfacealsograduallyextends.Thefreesurfaceandtheuppercavitysurfacecorrespondfairlytotheirshapes.However,thelowersideofthecavitysurfacewasratherleveledduetotheinfluenceofwallboundary.Theliftanddragcoefficientsofthis2-Dwedgebasicallykeeplinearrelationswiththenaturalcavitationnumbersmallerthan0.157,whereasdirectproportionfordragandinverseproportionforlift.

简介：平均深度的流动污染物质联合了的A2D模型基于空铅树网孔被建立精确地在这篇论文与不规则的自然边界在水区域模仿流动。格子被递归的分关于播种点产生。一个发现newneighbor算法被介绍。管理方程是在由越过在房间之间的接口使用有限的卷方法，和质量，动量和污染物质的正常流动的并置的保守变量的discretized被一个Godunov类型流动DifferenceSplitting(FDS)计划计算。模型被使用在一条腹股沟附近模仿流动地。计算的值与观察数据一致。结果显示空铅树网孔有好本地分辨率，高效率和容易的本地精炼。当适用于复杂流动领域时，空铅树格子模型能在效率提供获得，是清楚的或强壮砍流动。最后，模型在江苏HaizhouBay被用于流动地和集中地模拟。模仿的弄脏的区域与观察被匹配很好。因此，这个模型能被用来与不规则的自然土地边界预言实际的水区域的流动和集中地。

简介：Waveforcesactingontheoffshorestructureareofimportanceforthestructuredesignpointofview.Thereisasocalled'TwoTensionLegBuoyMooringSystem'designedtoopenuptheoilfieldinSouthChinaSea.Twobasesofthesystemaresittingontheseafloorof30-40metersdepthofwater.Inordertoconfirmthesafetyofthissystem,waveforcesareinvestigatedexperimentallyandnumerically.Nowadays,themeasuredmaterialsonthissubjectarescarce.InthemodeltestofDr.Chakrabarti,thetestset-upnecessitatedasmalluniformgapbe-tweenthemodelandtankfloor,andthecorrectresultsmustbecomefromanadjustment.Theauthorshavesolvedtheproblem.Inthepaper,twonumericalmethodsareadopted:3-Dboundaryintegralequationmethod)eigen-functionexpressionandmatchingmethod.TheformerconsistsofdistributionofHaskindGreen’functiononthebodysurface.Thelatter,however,bydividingthewholefluiddomainintosubregions,thevelocitypotentialforeachsubregionscanbedetermineduniquelybymatchingthevelocitypotentialontheircommonboundaries,whichwasexpressedformallybyitseigenfunctionexpansion.Asanexample,experimentalandnumericalresultsweregivenforacircularbaseinshallowsea.Theyagreequitewell.Althoughbothmethodsareeffective,thematchingmethodhasmoreefficiency.

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