正文描述:《《多孔跳跃边界条》word版》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、PorousJumpBoundaryConditionsPorousjumpconditionsareusedtomodelathin"membrane''thathasknownvelocity(pressure-drop)characteristics.Itisessentiallya1Dsimplificationoftheporousmediamodelavailableforcellzones.Examplesofusesfortheporousjumpconditionincludemodelingpressuredropsthroughscreensa
2、ndfilters,andmodelingradiatorswhenyouarenotconcernedwithheattransfer.Thissimplermodelshouldbeusedwheneverpossible(insteadofthefullporousmediamodel)becauseitismorerobustandyieldsbetterconvergence.ThethinporousmediumhasafinitethicknessoverwhichthepressurechangeisdefinedasacombinationofDa
3、rcy'sLawandanadditionalinertiallossterm:(7.22-1)where isthelaminarfluidviscosity, isthepermeabilityofthemedium, isthepressure-jumpcoefficient, isthevelocitynormaltotheporousface,and isthethicknessofthemedium.Appropriatevaluesfor and canbecalculatedusingthetechniquesdescribedinSec
4、tion 7.19.6.UserInputsforthePorousJumpModelOncetheporousjumpzonehasbeenidentified(inthe BoundaryConditions panel),youwillsetallmodelinginputsfortheporousjumpinthe PorousJump panel(Figure 7.22.1),whichisopenedfromthe BoundaryConditions panel (asdescribedinSection 7.1.4).Figure7.22.1:
5、 The PorousJump PanelTheinputsrequiredfortheporousjumpmodelareasfollows:1. Identifytheporous-jumpzone.2. Setthe FacePermeability ofthemedium( inEquation 7.22-1).3. Setthe PorousMediumThickness ( ).4. Setthe Pressure-JumpCoefficient ( ).5. Definethediscretephaseboundaryconditionf
6、ortheporousjump(fordiscretephasecalculations).IdentifyingthePorousJumpZoneSincetheporousjumpmodelisa1Dsimplificationoftheporousmediamodel,theporous-jumpzonemustbemodeledastheinterfacebetweencells,ratherthanacellzone.Thustheporous-jumpzoneisatypeofinternalfacezone(wherethefacesarelinese
7、gmentsin2Dortriangles/quadrilateralsin3D).Iftheporous-jumpzoneisnotidentifiedassuchbydefaultwhenyoureadinthegrid(i.e.,ifitisidentifiedasanothertypeofinternalfacezone),youcanusethe BoundaryConditions panel tochangetheappropriatefacezonetoa porous-jump zone.Define BoundaryConditions..
显示全部收起
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。