Fluent_Meshing_R16_Module08_CutCell

©2015ANSYS,Inc.November7,2020116ReleaseModule8:CutCellMeshingIntroductiontoANSYSFluentMeshing©2015ANSYS,Inc.November7,20202CutCellMeshingWhatyouwilllearnfromthispresentation•ThebenefitsandlimitationsofCutCellMeshing•HowCutCellgeneratesmeshes•HowtogeneratePrisms(Inflation)withCutCellmeshing©2015ANSYS,Inc.November7,20203PreprocessingWorkflowGeometryImportOptionsImportCADGeometryCleanupandRepairDiagnosticsHoleFillingPlaneSurface,RevolveEdges,SweepEdges,etcGeometryPreparationOperationsFacetedBooleanswithBuildTopologyMeshingMethodsHybridMesh:Tet,Hexcore,Prisms,PyramidsThinSweepGlobalMeshSizingLocalMeshSizingProximity,Curvature,BodyofInfluence,Soft,Hard,etc.GeometryImportMeshImportGeometryCreationGeometryOperationsMeshingSolverCutcellCreateBox,Frustrum,Cylinder,etcImportSTLReadMeshFluidExtractionwithWrapperGapClosingBoundaryModifySurfaceRemeshingFacetedGeometryOperations©2015ANSYS,Inc.November7,20204IntroductionBenefitsofCutCellmeshinginclude:•Nohighqualitysurfacemeshingrequired–badqualitySTLfacetscanbeusedasinputgeometry•Canhandleoverlappinggeometry•High%ofperfecthexelementswhichcanbelessnumericallydissipativeinCFDsimulations•Reducedcellcountforthesameresolutionofhexcoreortetrahedralmeshesduetohigh%hexelements•Mostlyhexprismsintheprismlayers•DrivenbyAdvancedSizingFunctionsforhighlyautomatedrefinementcontrolsforcurvatureandproximityonbothfeatureedgeandboundarybasis•Automatictreatmentofzero-thicknessbaffles•Fluidregionextractionfromsolidvolumeobjects+cappingfaceobjects©2015ANSYS,Inc.November7,20205CutCell:BehindtheScenes1.VolumeObjectscreated2.UniformCartesianmeshisgenerated3.Cellsintersectingthegeometryaremarked4.Refinementiscarriedoutbasedoncurvature,proximity,etc.5.Nodesareprojectedontothegeometryandifqualityisdegradedcellsarecut.Resultislayerofhex,tet,prismandpyramidontheboundary.6.CellsareseparatedintodifferentcellzonesaccordingtothedefinitionoftheVolumeObjects7.NewBoundariesareextractedcorrespondingtotheinputgeometry