简介:ThispaperextendstheSPHmethodtogassimulation.TheSPH(SmoothedParticlesHydrodynamics)methodisthemostpopularmethodofflowsimulation,whichiswidelyusedinlarge-scaleliquidsimulation.However,itisnotfoundtoapplytogassimulation,sincethosemethodsbasedonSPHcan’tbeusedinreal-timesimulationduetotheirenormousparticlesandhugecomputation.ThispaperproposesamethodforgassimulationbasedonSPHwithasmallnumberofparticles.Firstly,themethodcomputesthepositionanddensityofeachparticleineachpoint-in-time,andoutlinestheshapeofthesimulatedgasbasedonthoseparticles.Secondlythemethodusesthegridtechniquetorefinetheshapewiththediffusionofparticle’sdensityunderthecontrolofgrid,andgetmorelifelikesimulationresult.Eachgridwillbeassigneddensityaccordingtotheparticlesinit.Thedensitydeterminesthefinalappearanceofthegrid.Forensuringthenaturaltransitionofthecolorbetweenadjacentgrids,wegiveadiffuseprocessofdensitybetweenthesegridsandassignappropriatevaluestovertexesofthesegrids.Theexperimentalresultsshowthattheproposedmethodcangivebettergassimulationandmeettherequestofreal-time.
简介:Airentrappedinliquidmetalduringthemoldfillingprocessseriouslyaffectsthecastingquality,thusitisimportanttotrackitsbehaviorinthemoldcavity.Aliquid-gastwo-phaseflowmodelisdevelopedtodescribethemoldfillingprocessandpredicttheairentrapmentdefect.ThemodelisbasedonthecombinationofSOLAandLevelSetMethod.ThepressureandvelocityfieldsarecalculatedbySOLA,andtheinterfacemovementissimulatedbyLevelSetmethodasthemostcommoninterfacetrackingmethodinrecentyears.Inordertovalidatethefeasibilityofthemodel,theliquid-gastwo-phasesimulationresultsweretestedbythebrokendamproblemandtheS-shapedexperiment.ComparisonbetweentheexperimentsandsimulationresultsshowthatLevelSetmethodmightbeaverypromisingtoolintwo-phaseflowsimulationduringthemoldfillingprocess.
简介:和以往的宽屏产品主打“娱乐”不同,华硕M6N定位于商务和娱乐双重应用,它不仅保留了传统宽屏笔记本电脑的娱乐特色,还提供了优越的整机性能和相对较强的移动性。M6N采用了Pentium-M处理器,主频最高可达1.7GHz,配合Intel855PM芯片组和Intel无线PRO2100网络模块,使它成为了一款不折不扣的迅驰笔记本。M6N还搭载了256MB内存和40/60/80GB可选的硬盘。采用64MB独立显存的ATIMO-BILITYRADEON9600显卡是M6N的一大亮点,配上15.1英寸的宽屏和4声道3D立体声音箱,相信在工作和娱乐方面都能够有不错的表现。M6N的扩展性也不错,它的驱动器模块可选装DVD-ROM、Combo、DVD±RW等驱动器,还可替换为第二块硬盘或电池。一个IEEE1394接口、一个Type2PC卡插槽、红外线接口、一个串口、四合一读卡机、一个S端子以及四个USB2.0接口使M6N具备了连接多种外接设备的能力。另外,M6N还支持免开机CD播放功能。作为一款内置光驱的15英寸宽屏笔记本,M6N很不容易的将体重控制到了2.6kg,虽然这一成绩已经很不错,但是带着它旅行仍然不是一件轻松的...
简介:Polyamide(PA6)andpolycarbonate(PC)werepreparedbyaBrabendermixer(PLV-151)at240℃with30rpmfordurationof8and6minutesrespectively.Theepoxyresin(E)additioncanleadtosubstantialmicrostructuralchangesinthePA6/PCblends.Scanningelectronmicroscope(SEM)wasusedtoobservethemixturescharacterizedbythedomainsofclearlysegregatedhomophasesandvoidsbetweenthetwopolymers.PA6/PCofpolyamide6andpolycarbonatewithepoxyresinadditionunderthecompositionratioof20/80,20/80/1,40/60/1and40/60,weretestedtoverifythekeyroleofepoxyinpromotingthecompatibilityofPA6withPCduringblending.
简介:最近.老牌的杀毒软件厂商金山公司推出了“金山毒霸6”增强版。新的增强版在防范“木马”方面有所提升.对现在流行的“网络游戏盗号木马”和“网络银行交易盗号木马”都有较好的查杀能力。增强版依然传承了“毒霸’系列三种灵活的扫描方式(快速扫描、完全扫描和自定义扫描)。该产品提供自动修复系统的功能.