DynamicMesh in OpenFOAM

《DynamicMesh in OpenFOAM》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、DynamicMeshHandlinginOpenFOAMHrvojeJasakHenrikRuscheWikkiLtd,UnitedKingdomWikkiGmbH,Germanyh.jasak@wikki.co.ukh.rusche@wikki-gmbh.deFourthOpenFOAMWorkshopMontreal,Canada1-4June2009DynamicMeshHandlinginOpenFOAM–p.1/26IntroductionObjective•Presentthelayoutanduseofdynamicmeshfeatur

2、esinOpenFOAM•DemonstratehowobjectorientationmakesiteasytosetupcomplexinteractingmotionandtopologicalchangesTopics•Definitionofameshmotionproblem•GeometryhandlinginOpenFOAM:polyhedralcellsupport•Deformingmeshstrategies•FE-basedautomaticmeshmotionsolverfortheFVM•SupportintheFiniteV

3、olumeDiscretisation•Topologicalmeshchanges•Algorithmicimplications•Dynamicmeshclasseswithexamples:6-DOFfloatingbodies,ICengines,FSI•SummaryDynamicMeshHandlinginOpenFOAM–p.2/26BackgroundSimulationswithTime-VaryingGeometryinCFD•Inmanysimulations,shapeofcomputationaldomainchangesdur

4、ingthesolution,eitherinaprescribedmannerorasapartofthesolution•Incasesofprescribedmotion,itispossibletopre-defineasequenceofmeshesormeshchangeswhichaccommodatethemotion•...butmeshgenerationnowbecomessubstantiallymorecomplex•Solution-dependentmotionimpliestheshapeofcomputationaldo

5、mainisapartofthesolutionitself:dependsonsolutionparameters•Examplesofsolution-dependentmotion◦Contactstressanalysis:shapeandlocationofcontactregionisunknown◦Freesurfacetrackingsimulation:unknownshapeoffreesurface◦Fluid-structureinteractionDynamicMeshHandlinginOpenFOAM–p.3/26Pres

6、cribedMeshMotionExample:PrescribedMeshMotion•Domainshapeischangingduringthesimulationinaprescribedmanner•Motionisknownandindependentofthesolution•...butitisusuallyonlyprescribedatboundaries•Definitionofmovingmeshinvolvespointpositionandmeshconnectivityforeverypointandcellforevery

7、time-stepofthesimulation.Thisistypicallydefinedwithreferencetoapre-processororparametricallyintermsofmotionparameters(crankangle,valveliftcurve,etc.)•Solution-dependentmeshchangesareoutofthequestion:eg.meshrefinement•Canwesimplifymeshgenerationfordynamicmeshcases?DynamicMeshHandli

8、nginOpenFOAM–p.4/26Solution-DependentMotionExam