简介:NumericalsimulationsofextremewavegenerationarecarriedoutbyusingtheVolumeOfFluid(VOF)method.Extremewavesaregeneratedbasedonwavefocusingina2-Dnumericalmodel.TovalidatethecapabilityoftheVOF-basedmodeldescribedinthisarticle,thepropagationofregularwavesiscomputedandcomparedwiththetheoreticalresults.Byadjustingthephasesofwavecomponents,extremewavesareformedatgiventimeandgivenpositioninthecomputation.Thenumericalresultsarecomparedwiththeoreticalsolutionsandexperimentaldata.ItisconcludedthatthepresentmodelbasedontheVOFtechniquecanprovideacceptablyaccuratenumericalresultstoservepracticalpurposes.
简介:Anewmethodforsloshingsimulationinaswaytankispresent,inwhichthetwophaseinterfaceistreatedasaphysicaldiscontinuity,whichcanbecapturedbyawell-designedhighorderscheme.BasedonNormalizedVariableDiagram(NVD),ahighorderdiscretizationschemewithunstructuredgridsisrealized,togetherwithanumericalmethodforfreesurfaceflowwithafixedgrid.Thismethodisimplementedinanin-housecodeGeneralTransportEquationAnalyzer(GTEA)whichisanunstructuredgridsfinitevolumesolver.Thepresentmethodisfirstvalidatedbyavailableanalyticalsolutions.Asimulationfora2-Drectangulartankatdifferentexcitationfrequenciesoftheswayiscarriedout.AcomparisonwithexperimentaldatainliteratureandresultsobtainedbycommercialsoftwareCFXshowsthatthesloshingloadonthemonitorpointsagreeswellwiththeexperimentaldata,withthesamegrids,andthepresentmethodgivesbetterresultsonthesecondarypeak.Itisshownthatthepresentmethodcansimulatethefreesurfaceoverturningandbreakupphenomena.
简介:流动在在水的免费表面附近移动的轮船壳附近产生的表面波浪在这研究数字地被模仿。三维的含蓄的有限体积方法(FVM)被使用解决雷纳兹平均海军司烧(RANS)方程。可实现的k-e骚乱模型被实现了在免费表面地区在轮船壳附近捕获狂暴的流动。方法结合了的液体(VOF)的体积Stokes波浪理论被用来决定水的免费表面效果。由使用是一自由的六度当模特儿,轮船壳运动数字地一起与Stokes波浪被解决。在行动下面司烧海,在空气之间的接口和在一样的常规模式并且那么的水波浪上的波浪做压力和垂直速度。轮船壳搬到象波浪的一样的方法。轮船壳举的振幅是不到波浪高度因为抑制的粘性。这个方法能为轮船运动,波浪和水动力学的学习提供一本重要参考书。
简介:Investigatingthewavefieldnearstructuresincoastalandoffshoreengineeringisofincreasingsignificance.Inthepresentstudy,simulationisdoneofthewaveprofileandflowfieldforwavespropagatingoversubmergedbars,usingPLIC-VOF(PiecewiseLinearInterfaceConstruction)totracethefreesurfaceofwaveandfinitedifferencemethodtosolvevertical2DNavier-Stokes(N-S)equations.AcomparisonofthenumericalresultsfortwokindsofsubmergedbarswiththeexperimentalonesshowsthatthePLIC-VOFmodelusedinthisstudyiseffectiveandcancomputethewavefieldprecisely.
简介:文章通过对EFM(effectivefieldmodeling)模型进行简化,消除了原模型的非守恒性项和非双曲性特性项,发展了一种基于密度的气液两相流模拟方法:ρ-VOF方法.利用体积分数信息对控制单元内的自由界面进行重构,得到了控制单元内流体的空间分布,并采用AUSM^+-up格式获得考虑气液流体接触间断信息的对流通量.新方法可统一处理激波间断和接触间断的相互作用,保持自由界面的尖锐性,并且其计算量与自由界面的空间复杂度无关.最后,数值模拟了液体激波管气液激波管和气体激波跨二维液滴传播等问题,并与文献结果进行对比,验证了本方法在气液两相流模拟中的准确性.
简介:AnovelVOF-typevolume-trackingmethodfortwo-dimensionalfree-surfaceflowsbasedontheunstructuredtriangularmeshispresented.Owingtotheinherentmeritoftheunstructuredtriangularmeshinfittingcurvedboundaries,thismethodcanhandlethefree-surfaceproblemswithcomplexgeometriesaccuratelyanddirectly,withoutintroducinganycomplicatedboundarytreatmentorartificialdiffusion.ThemethodsolvesthevolumetransportequationgeometricallythroughtheModifiedLagrangian-EulerianRe-map(MLER)method,whichisappliedtoadvectivefluidvolumes.Moreover,thePLICmethodisadoptedtogiveasecond-orderreconstructedinterfaceapproximation.Tovalidatethismethod,twoadvectiontestswereperformedfortheestablishmentoftheaccuracyandconvergencerateofthesolutions.Numericalresultsforthesecomplextestsprovideconvincingevidencefortheexcellentsolutionqualityandfidelityofthemethod.