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1、Chapter 3Chapter 3Shell Meshing Workshop 1Workshop 1Stamped PartICEM CFD Introductory CourseWS3.1-1ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualCreate Project/Open Geometry File New Project Enter the Stamping folder Type Fil
2、e Geometry Open Geometry Select stamped_zero_thickness.Type Stamped-mesh Savetin OpenWS3.1-2ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualBuild TopologyBuild Topology is absolutely necessary before running patch based surface
3、 mesher:Determines connectivity of surfaces so etees coectty o su aces sothat mesh is connected across surfaces Geometry Repair Geometry Build Diagnostic Topology It is always advisable to estimate the allowable gap(tolerance)by making a small distance measurement Leave the default tolerance at 0.2.
4、Could be slightly smaller Leave Filter points and Filter curves offp Apply Also extracts curves and pointsWS3.1-3ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualSet Curve Mesh Sizes The Patch based surface mesher uses curve siz
5、es,not surface sizes(except for when adapt mesh interior is on)Mesh Curve Mesh Setup Mesh Curve Mesh Setup Select all curves Maximum size=1.5 Applypp y To view node positions,right mouse click in the model tree on Curves Curve Node SpacingSpacingWS3.1-4ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights
6、 reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualSet Shell Meshing Parameters and Compute Set the mesh default type and method to use Mesh Global Mesh Setup Shell Meshing Parameters Mesh type=Quad Dominant(most common for shell meshes)Mesh method=Patch Dependentp Set Section
7、 to Patch Dependent Ignore size=0.2 Nodes and thin loops will be merged across this distance The default ignore size will be the same as the tolerance from Build gDiagnostic Topology Compute Mesh Mesh Compute Mesh Surface Mesh OnlyCt ComputeWS3.1-5ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights rese
8、rved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualInspect Sharp Angles Zoom in close on the red boxed section Youll notice grid lines match the curves at the boundaries on this sharp-angled triangular surfacetriangular surface Curves can be deleted non-permanently,which will not d
9、estroy the connectivity between surfaces The curves will be made dormant Nodes will not be constrained here after the curve deletionWS3.1-6ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualDelete Some Curves Geometry Delete Curve
10、y Ensure that Delete permanently is off Select the curves shown Select Yes,when it says,Mesh exists.Rhtth df?Remesh attached surfaces?Mesh is no longer constrained to the small angle There are 3 other similar locations in this model where curves can also be deletedDormant curves can be shown by aWS3
11、.1-7ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Dormant curves can be shown by a right mouse click in the model tree on Curves Show DormantShell Meshing Workshop 1Training ManualInspect Sliver Surface Zoom in to the sliver surface in the red boxed area Use the t
12、ape measure to find the distance across(abo t 0 6)the distance across(about 0.6)Mesh Global Mesh Setup Shell Meshing Parameters Set the ignore size to slightlySet the ignore size to slightly greater than this distance Ignore size=0.7 ApplyWS3.1-8ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserv
13、ed.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualRecompute MeshMesh Comp te Mesh S rface Mesh Compute Mesh Surface Mesh Only Compute The ignore size merged out theThe ignore size merged out the thin loop This would have also taken care of the previous sharp angle problem if you did
14、 not choose to make curves dormantWS3.1-9ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualQuad Rings Create quad rings around the holes Mesh Curve Mesh Setup Select the curves of the 5 holes shown The 3 parameters used for surfa
15、ce mesh inflation are:Height Height ratioN m of la ers Num.of layers If only the Num.of layers is entered,then the Height will be the same as the Maximum size and the Height ratio will assumed to be 1.Set Num.of layers=4 Apply Recompute MeshWS3.1-10ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights res
16、erved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualSet Height and Height Ratio The quad rings are very big,and you will notice 3 rings that collide with nearby features,interrupting some layerssome layers Mesh Curve Mesh Setup Select the curves of the 5 holes again Height=0.3(firs
17、t layer hight)Collisions Height ratio=1.4(1.0 to 1.5 are typical)Apply Recompute MeshCollisions with nearby loopWS3.1-11ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664Shell Meshing Workshop 1Training ManualSave ProjectOrOr Save Project Saves geometry,mesh,settings file(.prj),view Mesh sizes and methods are saved to the geometry file(.tin)WS3.1-12ANSYS,Inc.Proprietary 2009 ANSYS,Inc.All rights reserved.July 2009Inventory#002664