简介：Wepresentthesimulationofthedynamicsoffluid-cylinderinteractionsinanarrowthree-dimensionalchannelfilledwithaNewtonianfluid,usingaLagrangemultiplierbasedfictitiousdomainmethodologycombinedwithafiniteelementmethodandanoperatorsplittingtechnique.Asexpected,asettlingtruncatedcylinderturnsitsbroadsideperpendiculartothemainstreamdirectionandthecenterofmassmovestothecentralaxisofthechannel.Inthecaseoftwotruncatedcylinders,theyfirstmovearoundeachotherforawhileandthenstaytogetherina"T"shape.Afterthe"T"shapehasbeenformedforalongenoughtime,wefoundnovortexsheddingbehindthecylinders.Whensimulatingthefluidizationof60truncatedcylinders,wecapturedthefeaturesofinteractionsamongfluidizedcylindersasobservedinexperiments.

简介：在动人的水平圆柱的热来源附近阶段变化材料融化的接触，在它的自己的重量下面下降了，在这篇文章被调查。在经常的表面热流动下面的一个融化的模型被建立。厚度和压力分布里面的分析结果融化层，稳定的融化速度被使用融化理论的接触获得。融化的法律被讨论，并且由温度差别与接触融化的相比开车。伪稳定的融化速度被热来源密度的热来源，和变化的热流动决定，这被发现在融化上有更少的效果速度。

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简介：Calculationofthescatteredfieldoftheeccentricscatterersisanoldproblemwithnumerousapplications.Thisstudyconsiderstheinteractionofaplanecompressionalsoundwavewithaliquid-encapsulatedthermoviscousfluidcylindersubmergedinanunboundedviscousthermallyconductingmedium.Thetranslationaladditiontheoremforcylindricalwavefunctions,theappropriatewavefieldexpansionsandthepertinentboundaryconditionsareemployedtodevelopaclosed-formsolutionintheformofinfiniteseries.Theanalyticalresultsareillustratedwithanumericalexampleinwhichthecompoundcylinderisinsonifiedbyaplanesoundwaveatselectedanglesofincidenceinawiderangeofdimensionlessfrequencies.Thebackscatteredfar-fieldacousticpressureamplitudeandthespatialdistributionofthetotalacousticpressureinthevicinityofthecylinderareevaluatedanddiscussedforrepresentativevaluesoftheparameterscharacterizingthesystem.Theeffectsofincidentwavefrequency,angleofincidence,fluidthermoviscosity,coreeccentricityandsizearethoroughlyexamined.Limitingcaseinvolvinganidealcom-pressibleliquid-coatedcylinderisconsideredandfairagreementwithawell-knownsolutionisestablished.

简介：数字建模在上短暂电磁的散布由atwo维(2D)位于演变时间的不平的表面的柱体被usingtime域积分方程介绍。一个逐渐变细的高斯脉搏事件波浪的建议特殊选择把截断错误从不平的表面移开。另外，一种二水平的平均技术被利用从行进解决不可分的方程的过程的时间克服不稳定性。在表面水流分布之间的优秀通讯，以及thefar地区地，由建议方法计算了，那由与反的分离Fourier转变计划联系的时刻的传统的方法获得了表明建模的精确性。

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简介：Themajorcausesofthesoundpressurelevel(SPL)variationduetothechangesoftheinclinedangleofacircularcylinderandtheaspectratio(ratioofdistancebetweenendplatestocylinderdiameter)wereinvestigated.Thevelocityfluctuationofthewakeandthesurfacepressurefluctuationofthecylinderweremeasuredinalownoisewindtunneltofindthecorrelationlength,coherentoutputpowerandStrouhalnumber.TheresultsshowthatthechangesofthesevaluesqualitativelycorrespondwiththechangeofSPL.Flowvisualizationtestsareperformedtoclarifythevariationofwakeinrelationwithinclinedangleandaspectratio.ItisfoundthatthespanwisestructureofKarman’svortexstreetisbrokendownbytheupwardflowsgeneratedaroundthebottomendplate,andthedegreeoftheinterferencebetweentheupwardflowandKarman’svortexstreetissmallerwhentheaspectratioislarger.

简介：Inthisstudy,anelectro-mechanicalvalve(EMV)systemfortheintakevalveofafourstroke,singlecylinder,overheadvalveandsparkignition(SI)enginewasdesignedandconstructed.AnenginewiththeEMVsystemandastandardengineweretestedtoobservetheeffectsoftheEMVonengineperformanceandemissionsatdifferentspeedsunderfullload.TheEMVengineshowedimprovedenginepower,enginetorqueandbreakspecificfuelconsumption(BSFC).A66%decreaseinCOemissionswasalsoobtainedwiththeEMVsystem,buthydrocarbons(HC)andNOxemissionsincreasedby12%and13%respectively.

简介：现在的学习在拉长的柱体上面对magnetohydrodynamics和热产生/吸收系数在威廉森液体的停滞点流动上揭示homogeneous/hetereogeneous反应的效果。进一步，可变热电导率和热层化的效果也被考虑。管理部分微分方程在类似转变的帮助下被变换成平常的微分方程。系统联合了非线性的平常的微分方程然后被射击解决技术。MATLAB射击代码被比较在限制情况与以前出版的工作验证。当现在的结果与MATLAB内建的功能bvp4c相比时，结果进一步被加强。突出的参数的效果为速度，温度和集中侧面图形地被商讨。为不同参数的皮磨擦系数和Nusselt数字在桌子的帮助下被调查。