简介:采用格子-Boltzmann方法对平行平板间甲醇水蒸气重整反应过程进行模拟,其中包括反应、对流、扩散。模拟中假设化学反应对流场没有影响,流场、温度场和组分场可分别利用演化方程进行求解.利用多尺度技术可分别将演化方程回归到对应的宏观方程。在低Ma的条件下格子-Boltzmann方法模拟的结果与传统Navier-Stokes方程数值计算结果进行对比,吻合得较好,证明了格子-Boltzmann方法的可靠性。
简介:Toanalyzeanddepictcomplicatedfluidbehaviorsinfracturedporousmediawithvariablypermeablematrix,anintegrateddiscretecomputationalalgorithmisproposedbasedonlatticeBoltzmannmethod(LBM).Thispapercombineswiththeexternalforcemodelandstatisticalmaterialphysicstoeffectivelydescribethefeaturechangeswhilethefluidpassesthroughthefractureswithinthepermeablematrix.Asanapplicationexample,atwodimensionalrocksampleisreconstructedusingthedigitalimageandcharacterizedwithdifferentfeaturevaluesateachLBMgridtodistinguishpores,impermeableandpermeablematrixbystatingitslocalphysicalproperty.ComparedwiththeconventionalLBM,theresultsdemonstratetheadvantagesofproposedalgorithminmodelingfluidflowphenomenoninfracturedporousmediawithvariablypermeablematrix.
简介:A2-DLatticeBoltzmannMethod(LBM)coupledwithaSub-GridStress(SGS)modelisproposedandvalidatedbyflowsaroundanon-submergedspurdikeinachannel.AndthentheLBM-SGSmodelisfurtherappliedtoflowsinapumping-stationforebay.ShallowwaterequationsarenumericallysolvedbytheLBMandtheturbulencecanbetakenintoaccountandmodeledefficientlybytheLargeEddySimulation(LES)model.Thebounce-backschemeofthenon-equilibriumpartofthedistributionfunctionisusedattheinletboundary,thenormalgradientofthedistributionfunctionissetaszeroattheoutletboundaryandthebounce-backschemeisappliedtothesolidwalltoensurenon-slipboundaryconditions.Firstly,themodelsuccessfullypredictstheflowcharacteristicsaroundaspurdike,suchascirculatingflow,velocityandwaterdepthdistributions.TheresultsareverifiedbytheexperimentaldataandcomparedtotheresultsobtainedbyconventionalSmagoringskyModel(SM)ofLES.Finally,theLBM-SGSmodelisusedtofurtherpredicttheflowcharacteristicsinaforebay,suchassecondaryflowandwaterlevel.Thecomparisonsshowthatthemodelschemehasthecapacitytosimulatecomplexflowsinshallowwaterwithreasonableaccuracyandreliability.
简介:经过亿万年自然选择,鱼类进化出非凡高效的游动能力,研究其游动机理,对改善现有潜水器的性能具有重要指导意义.针对类鳗鱼游动问题,采用浸入边界法-格子Boltzmann方法(immersedboundary-latticeBoltzmann,IB-LBM)对三维波动翼进行1×10~8网格大规模数值模拟.在广州超算中心天河-2上模拟了不同振动幅度下正弦波动翼的非定常运动,给出了流场涡系结构及其产生的非定常力,清晰捕捉了仿生翼非定常涡系演化过程.仿真结果表明IB-LBM方法能在较大运动边界情况下保持算法稳定性,也能在较大网格下高效运行.同时精细捕捉不可压非定常流场涡系结构细节,是一种较为理想的仿生运动数值模拟方法.
简介:Analysistechnologyforelectricalandmechanicaldynamicsofpowerelectronicsequipment.ApplicationofHumanoidRobotSystemforBuildingandHomeManagementService:5thReport:DevelopmentofPrototypeSystem.Braking&tractioncontrolsystemdevelopmentusingCAEtools.BuildinganenginesimulatorforECUtesting.Cableinstallationinvirtualenvironments.
简介:DistributedHardware-In-the-LoopSimulatorforAutonomousContinuousDynamicalSystemswithSpatiallyConstrainedInteractions;Drivingareal-timemulti-physicssimulatortofollowanactualsystem:aDAEobserverapproach;Dynamic-windowsearchforreal-timesimulationofdynamicsystems;Efficientsolvingmethodsexploitingsparsityofmatrixinreal-timemultibodydynamicsimulationwithrelativecoordinateformulation;FlexibleMaterialsinAvangoVirtualEnvironmentFramework;GeneralizedaveragemodellingofFACTSforrealtimesimulationinARENE。