简介:摘 要:本文是对某TMF型(上冷冻、下冷藏式)风冷冰箱的冷冻风道进行CFD仿真,得到冷冻风道的流线图,压力云图,风道各出风口的出风量和占比数据。分析出,风扇与风道腔体边界距离偏小,空气撞击在边界上易形成局部涡流,增大风道局部阻力;风道左上,右上两出风口风量不均匀,右上出风口相对左上出风口流线密度有降低,出风口风速降低。并进行实验测试风道的各出风口风量,同仿真结果进行对比,测得各处风口风量趋势和仿真结果一致。
简介:NumericaltechniquesplayanimportantroleinCFD.Someofthemarereviewedinthispaper.ThenecessityofusinghighorderdifferenceschemeisdemonstratedforthestudyofhighReynoldsnumberviscousflow.Physicalguidelinesareprovidedfortheconstructionofthesehighorderschemes.Toavoidundulyadhoctreatmentintheboundaryregiontheuseofcompactschemeisrecommendedbecauseithasasmallstencilsizecomparedwiththetraditionalfinitedifferencescheme,BesidespreliminaryFourieranalysisshowsthecompactschemecanalsoyieldbetterspaceresolutionwhichmakesitmoresuitabletostudyflowwithmultiscalese.g.turbulence.Otherapproachessuchasperturbationmethodandfinitespectralmethodarealsoemphasized.Typicalnumericalsimulationswerecarriedout.ThefirstdealswithEulerequationstoshowitscapabilitiestocaptureflowdiscontinuity.TheseconddealswithNavier-Stokesequationsstudyingtheevolutionofamixinglayer,thepertinentstructuresatdifferenttimesareshown.Asymmetricbreakdownoccursandalsotheappearanceofsmallvortices.
简介:摘要:以某办公房间为例,利用计算流体力学( CFD)技术,对办公房间通风方案进行模拟。本文重点分析了通风过程中工作区的空气速度矢量、温度和空气年龄分布特性,以此为依据评价了室内的空气质量,并以此对送回风口的位置进行了调整,找到了较好的通风方式。对计算过程及结果的分析表明,送回风口的位置不同,不仅对室内的空气环境质量有影响,而且还会影响网格的划分与计算收敛的情况。
简介:Thispaperdevelopsahypersonicaerothermalsimulationmethodformissileslotflow.ThefinitevolumemethodofstructuregridsolverisdevelopedforsolvingEulerandNavier-Stokesequations.ThesolverincludesPark'stwotemperaturemodelandtheairmulti-speciesreactionmodel.Thesecond-orderaccuracyTVDnumericalmethodwasdeducedtocomputethehypersonicaeroheatingwhichimprovesthecomputationalefficiency.Computationalresultsaregiventoshowthehighaccuracycomparingtotheexistingexperimentaldata.
简介:NowadaysComputationalFluidDynamics(CFD)softwareisadoptedasadesignandanalysistoolinagreatnumberofengineeringfields.Wecansaythatsingle-physicsCFDhasbeensufficientlymaturedinthepracticalpointofview.ThemaintargetofexistingCFDsoftwareissingle-phaseflowssuchaswaterandair.However,manymulti-physicsproblemsexistinengineering.Mostofthemconsistofflowandotherphysics,andtheinteractionsbetweendifferentphysicsareveryimportant.Obviously,multi-physicsphenomenaarecriticalindevelopingmachinesandprocesses.Amulti-physicsphenomenonseemstobeverycomplex,anditissodifficulttobepredictedbyaddingotherphysicstoflowphenomenon.Therefore,multi-physicsCFDtechniquesarestillunderresearchanddevelopment.Thiswouldbecausedfromthefactsthatprocessingspeedofcurrentcomputersisnotfastenoughforconductingamulti-physicssimulation,andfurthermorephysicalmodelsexceptforflowphysicshavenotbeensuitablyestablished.Therefore,innearfuture,wehavetodevelopvariousphysicalmodelsandefficientCFDtechniques,inordertosuccessmulti-physicssimulationsinengineering.Inthepresentpaper,Iwilldescribethepresentstatesofmulti-physicsCFDsimulations,andthenshowsomenumericalresultssuchasiceaccretionandelectro-chemicalmachiningprocessofathree-dimensionalcompressorbladewhichwereobtainedinmylaboratory.Multi-physicsCFDsimulationswouldbeakeytechnologyinnearfuture.
简介:摘要:提升滑油泵设计能力是提高滑油泵研发能力的源头,传统上滑油泵性能依赖试验结果验证,而此验证过程将极大延缓研发周期,为改善和提高产品设计能力,本文基于Simerics仿真平台对航空内啮合齿轮泵和外啮合齿轮泵开展CFD计算分析,对内啮合齿轮泵流体压力、速度矢量、转子厚度和偏心距进行影响性分析,对外啮合齿轮泵的转速、进口压力和出口压力进行影响性分析。