简介：NumericaltechniquesplayanimportantroleinCFD.Someofthemarereviewedinthispaper.ThenecessityofusinghighorderdifferenceschemeisdemonstratedforthestudyofhighReynoldsnumberviscousflow.Physicalguidelinesareprovidedfortheconstructionofthesehighorderschemes.Toavoidundulyadhoctreatmentintheboundaryregiontheuseofcompactschemeisrecommendedbecauseithasasmallstencilsizecomparedwiththetraditionalfinitedifferencescheme,BesidespreliminaryFourieranalysisshowsthecompactschemecanalsoyieldbetterspaceresolutionwhichmakesitmoresuitabletostudyflowwithmultiscalese.g.turbulence.Otherapproachessuchasperturbationmethodandfinitespectralmethodarealsoemphasized.Typicalnumericalsimulationswerecarriedout.ThefirstdealswithEulerequationstoshowitscapabilitiestocaptureflowdiscontinuity.TheseconddealswithNavier-Stokesequationsstudyingtheevolutionofamixinglayer,thepertinentstructuresatdifferenttimesareshown.Asymmetricbreakdownoccursandalsotheappearanceofsmallvortices.

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：摘要通过流体力学的研究，利用现代计算机仿真技术，采用CFD软件FLUENT对坐便器冲水过程进行气—液两相流分析，得出了坐便器冲水过程的水流范围分布、选定点水流速度变化、总压分布情况，用于分析坐便器的冲洗功能，在设计阶段即对坐便器的冲洗能力、质量进行分析，并对坐便器进行优化设计，从而提高坐便器的产品质量，提高坐便器的检验合格率。

简介：Acombustionmodelofalarge-scalesupercriticalcirculatingfluidizedbed(CFB)boilerwasdevelopedforcomprehensivecomputational-fluid-dynamicsanalysis.Themodelincorporatesgas-solidhydrodynamics,coalcombustion,heattransferonheatexchangesurfacesinthefurnace,andheattransferbetweenfumaceandworkingmediumintheheattransfertubes.Insimulatingthedenseanddilutephasesinthefumace,thegas-solidhydrodynamicsisbasedontheEuler-Eulermodelandenergy-minimizationmultiscaledragmodel.Coalcombustionentailsevaporation,devolatilization,charcombustion,gashomogeneousreaction,andpollutantemission.Thecoefficientofheattransferbetweengas-solidandthewaterwallisestimatedusingtheclusterrenewalmodel,andforradiation,thediscreteordinatemodelisused.Moreover,thermohydraulicprocessesinthemembranewallarealsoineludedintheheattransferprocess.Themodelwassuccessfullyappliedinsimulationsofa350-MWsupercriticalCFBboiler.Detaileddistributionsofsolidsconcentration,oxygen,heatflux,andworkingmediumtemperatureintheboilerfurnacearepresented.

简介：摘要近年来，随着通用图形处理器技术的发展，单个GPU的浮点性能比CPU高一个量级以上。采用GPU实现CFD计算为快速仿真分析提供了有力的途径，但目前GPU上的CFD计算方法尚未成熟，仍有大量的相关数值计算问题有待研究和完善。本文采用CUDA技术，针对NVIDIATeslaK40cGPU，编写了基于有限体积法的二维CFD求解程序。着重研究了网格排序、存储器对齐、数据存储格式对计算效率的影响。

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：摘要针对节能竞技赛车车身，在CATIA车身建模中引入翼型以改善空气的流动特性。通过控制变量法研究适用于节能车模型的CFD边界层网格画法。针对尾部的三维涡流，对节能车不同分型面进行CFD对比研究出一种可减少空气阻力系数的斜分型面设计，从而改善车身的空气动力学性能，降低赛车油耗。

简介：InthisarticletheUDFscriptfileintheFluentsoftwarewasrewrittenasthe'connectingfile'fortheFluentandtheANSYS/ABAQUSinorderthatthejoinedfilecanbeusedtodoaero-elasticcomputations.InthiswaythefluidfieldiscomputedbysolvingtheNavier-Stokesequationsandthestructuremovementisintegratedbythedynamicsdirectly.Ananalysisofthecomputedresultsshowsthatthiscoupledmethoddesignedforsimulatingaero-elasticsystemsisworkableandcanbeusedfortheotherfluid-structureinteractionproblems.

简介：针对有关毒气急性中毒研究只能根据经验公式和接触限值划定危险区域进行定性评估的现状，提出结合毒气泄漏CFD数值模拟与中毒剂量反应模型进行中毒定量评估的方法。通过CFD计算泄漏毒气的实时浓度场，根据浓度场和暴露时间确定人员暴露剂量，最后根据剂量反应模型确定人员死亡百分比。以某硫黄回收装置的硫化氢泄漏为例，建立CFD模型。设置距地面高1．5m，与泄漏源水平距离分别为100m、200m、300m、400m、500m的5个监测点作为工作人员的急性中毒地点，模拟分为构建初始风场、硫化氢泄漏及随风场扩散3个阶段，根据CFD求解得出的监测点的硫化氢实时浓度场并结合中毒剂量反应模型对监测点人员中毒死亡风险进行定量评估。研究表明，基于CFD的毒气泄漏中毒定量评估技术能对泄漏区域任意位置、任意时刻的人员中毒风险进行定量评估，弥补了目前大多定性评价方法的不足。

简介：

简介：Anyonefollowingtheprogressofroboticsfieldsforaerial,underwaterorgroundapplicationsappreciatestheimportanceoflearningofgooddesignfromnature.Theemerging

简介：本文对船体贴体网格进行了剖分,所得网格可用于船舶CFD数值计算.列出了网格质量的判定标准,给出了判定参数的计算方法和意义.进而用ICEMCFD剖分了船体网格,并给出了结构网格、非结构网格、混合网格的剖分流程和剖分时的注意事项.S60船体结构较为简单,采用结构网格;集装箱船体结构较为复杂,采用非结构网格.结果表明,生成网格质量较高.

简介：空调系统形式对于高大空间剧场的室内环境具有决定性影响，为验证空调系统形式合理性在设计阶段采用模型实验是不现实的，而CFD模拟是一种成本低、速度快、资料完备的有效方法。本文采用计算流体力学模拟软件STARCD对某剧场夏季和冬季室内热环境进行模拟，根据模拟结果分析其空调系统设计方案的合理性并提出改进建议。

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：CFD技术在暖通空调工程中的研究和应用也进行地如火如荼,CFD技术数值模拟暖通空调气流组织,　　2CFD技术在暖通空调领域的应用

简介：摘要：油气储运应用技术是目前石油企业开采原油所需要落实的新课题，全面提高油气储运技术，可以有效提高油气储运质量以及效率，避免造成油气泄露等情况，减少油气能源的消耗量，加大对油气自动化技术的推广与应用，实现石油企业对油气储运工程的成本控制，安全控制等。本文主要分析CFD在油气储运工程领域的应用。

简介：AnumericalcasestudyonidentifyingtheoptimumnumberofbucketsforaPeltonturbineispresented.Threeparameters:numberofbuckets,bucketradialpositionandbucketangularpositionaregroupedsincetheyarefoundtobeinterrelated.Byidentifyingthebestcombinationoftheradialandangularpositionforeachnumberofbucketsitisshownthatreductioninthenumberofbucketsbeyondthelimitsuggestedbytheavailableliteraturecanimprovetheefficiencyandbebeneficialwithregardtothemanufacturingcomplexityandcostperspective.Theeffectofthisreductioninthenumberofbucketswasconfirmedexperimentally.

简介：Theresearchpurposeofthispaperistoestimatetheimpactsoftheparametersoftheguideplateontheverticalmotioncharacteristicsofthemoonpoolfluid.Withthevolumeoffluid（VOF）method,three-dimensionalmodelsofthemoonpoolfluidmotionsofthetrusssparplatformareestablished.Simulationresultsarethenpresentedforthemoonpoolforcedoscillationbyemployingthedynamicmeshmethodanduser-definedfunctionsinFLUENT.Themotionsofthemoonpoolfluidandtheloadsontheguideplatesareobtainedforbothcasesofsquare-ringandcrisscross.Theresultsshowthattheshapeandareaoftheguideplateatthebottomofthemoonpoolhaveasignificantimpactonthephysicalparametersofthemoonpool,includingtheloadonthemoonpoolguideplate,motionformofthemoonpoolfluidandthemassflowrate.

简介：Gas-solidtwo-phaseflowinacirculatingfluidizedbed(CFB)isaffectedbyoperatingconditions(e.g.,superficialgasvelocity,solidsinventory),materialpropertiesandgeometricfactors,suchastheentryandexitconfiguration.Inparticular,thesuspensionsection,whichislocatedbetweentheriserbottomandthesolidsrecycleinlet,affectsthehydrodynamicsintherisersignificantly.However,thesuspensionsectionhasreceivedlessattentioncomparedwithothergeometricfactors.Mostcomputationalfluiddynamics(CFD)simulations,especiallytwo-dimensionalsimulationsdonottakethisfactorintoaccount.Weperformedthree-dimensional,full-loopCFDsimulationswithadragcoefficientthatwasdeterminedbytheenergy-minimizationmulti-scalemodel,andinvestigatedtheflowbehavioroftwoCFBswithdifferentsuspension-sectionlengths.ThesimulationresuitsrevealedthattheaxialprofilesofvoidageintheriserwithalongersuspensionsectionaremorelikelyS-shaped,whereasthosewithshortersuspensionsectionsdecayexponentially.ThedependencesofsolidsfluxonsolidsinventorydifferinthetwoCFBs.Ashortersuspensionsectionmayresultinasmoothtransitionfromdilutetodensetransportwithoutintermediateaccumulativechoki-ng,whereasaIongersuspensionsectionmayleadtoachokingtransition.Thesesimulationresultsarequalitativelyconsistentwiththeflowbehaviorsdescribedinliterature.