教程案例讲稿202106学习icem prism.pptx

Appendix 5Additional Prism Meshing FeaturesIntroduction to ANSYSICEM CFDSetting Prism Parameters on CurvesMesh Curve Mesh SetupYou can get Prism to transition linearly across a surface by not setting a height (height = 0) on the surface, but instead set a different height on each curve on the opposite sides of the prism surfaceHeight ratio and Num. of layers have no affect on prism for curve settingsGlobal height must also be zeroInterpolate heights must be ON in Advanced Prism ParametersHeight = 0.01Height = 0 on surfaceHeight = 0.003Prism Options – Fillet RatioBlends prism grid lines around sharp corners0 = no fillet1 = fillet radius equals last prism heightImproves angles further away from the cornerOrients prisms more in direction of flowIf meshing tight spaces with tight curves (less than 60o), may not have space for a fillet radiusFillet Ratio = r/hhrFillet Ratio = 1.0Fillet Ratio = 0.0Fillet Ratio = 0.5Prism Options-Part Control New volume partCan specify new Part for prism elementsMust specify if extruding from surface-only meshIf extruding into volume mesh, prism will inherit tetra volume part if this field is left blankSide partFor quad faces on prism side boundaryTop partFor tri faces capping off top of last prism layerExtrude into orphan regionExtrude prisms away from existing volume, not into itMust specify new volume, side and top part, or they’ll be in ORFNLeaving these parts blank will inherit the names from the current meshAdvanced Prism Meshing ParametersThese are best left at default for most modelsAuto ReductionAchieves layer compressionProduces very thin layers where otherwise collisions would result in pyramidsMust redistribute prism layer afterwardIntermediate writeWrites “prism.uns” after each layer in case the process crashesOpen prism.uns and inspect for problems Blayer 2dFor running prism on a 2D modelSelect curve parts instead of surface parts for inflationMust select surface parts in place of volume partsStair StepControls gradual or im