課件教程2021-06學(xué)習(xí)mesh

1、Workshop 6.1: Local Mesh ControlsIntroductionBackgroundThis workshop will demonstrate how multiple methods and local controls can be combined to create a conformal hybrid mesh on a multibody part (valve geometry).ObjectivesMethodsMultiZone, Sweep, Patch conforming Tetrahedrons.Local SizingEdge & Fac

2、eLocal InflationSelective MeshingStarting WorkbenchCreate the Workbench Project: Start Workbench R16 or create a new project.If you have access to DesignModeler, follow the instructions below, otherwise skip to the next slide.Open the project “AMWS6.1-Startup.wbpj” located in the Meshing workshop in

3、put files (WS6.1) folder.This project contains a completed geometry.Drag a Mesh Component System and drop on Cell A2 of the Geometry System as shown.This will attach the Mesh Component System to the Geometry System.Start ANSYS Meshing by double clicking on the Mesh Cell (B3) of the Mesh System.Start

4、ing WorkbenchCreate the Workbench Project: If you do not have access to DesignModeler, follow these instructions.From the Workbench File Menu, select Import and browse to the file “valve.meshdat” located in the Meshing Workshops Input-Files folder and open it.Drag a Mesh Component System and drop on

5、 Cell A2 of the Geometry System as shown.This will attach the Mesh Component System to the Geometry System.Start ANSYS Meshing by double clicking on the Mesh Cell (A3) of the Mesh System.Set Global Meshing Options: Set Physics Preference to CFDSet Solver Preference to FLUENTIn the Units menu set Met

6、ric (mm, kg, N, s, mV, Ma)Units and PreferencesModelReview the Geometry:The geometry represents a valve with one inlet distributed through a central spherical region to three outlets.A mesh will be generated on the fluid region only in this workshop.In the Outline expand Geometry, right click on Par

7、t2 and select Suppress Body from the Context Menu as shown.This will suppress all bodies contained within Part2 which represents the solid outer region in this case. The (transparent) fluid region will be displayed. PreparationPlanningIn the Outline, right click on Mesh and select Show Sweepable Bod

8、ies.Three of the five bodies could be meshed using the Sweep Method.The central region is complex and therefore will be meshed using the Patch Conforming Tetrahedral Method.The remaining body cannot be swept using the standard sweep method since it contains multiple source faces as shown. MultiZone

9、will however be able to sweep this. In the Graphics Window , right click View Left or click the X Axis on the Triad to view. Set Global Mesh OptionsSetup Advanced Size Function:To adequately capture the curved geometric features a Curvature Size Function will be used.In Details of “Mesh” under Sizin

10、g make sure that “Use Advanced Size Function” set to “On:Curvature”.Leave all other options to default as shown. Create Named Selections:Switch the view to isometric and ensure the Selection Filter is set to Face.Select the face as shown, right click in the Graphics Window and select Create Named Se

11、lection from the Context Menu.In the Selection Name Dialog Box set the name to “Inlet” and click OK. Named SelectionsCreate Named Selections (Continued):Using the same procedure create Named Selections for the two faces as shown (Outlet1 & Outlet2). Named SelectionsOutlet1Outlet2Create Named Selecti

12、ons (Continued):In the Graphics Window, right click and select View Left (or use the Triad -X). Zoom in as shown.Select one of the four small circular faces, right click Create Named Selection.In the Selection Name Dialog Box set the name as “Outlet3” and select Apply geometry items of same Size as

13、shown. Click OK. Named SelectionsCreate Named Selections (Continued):In the Outline, expand Named Selections and click on Outline3.The worksheet details the method by which the Named Selection is scoped to faces in this case by size. Switch the worksheet on/off using the Worksheet button in the Tool

14、bar.Note that the Named Selection contains all four identical faces. Named SelectionsSetup MultiZone for the Non-Sweepable Body:Multizone method can be used to mesh cases where multiple source faces are there(Sweep supports only single Source face). Click Mesh in the Outline.Switch the view to isome

15、tric , set the Selection Filter to Body and select the non sweepable body as shown.Right click Insert Method.Under Details of “Automatic-Method” change Method to Multizone.The Details view will now be named Details of “Multizone”.Set Surface Mesh Method to “Uniform”.Leave all other settings to defau

16、lt as shown. MultiZone MethodInsert Face Sizing:In the Outline, under Named Selections right click on Outlet3 and click Select Items in Group.This will select all the faces contained within that Named Selection.In the Outline, right click on Mesh and select Insert Sizing.Note: that the Details of “F

17、ace Sizing” has the Geometry Selection populated with the 4 faces within the Named Selection. You can also use Named Selections directly under Scoping Method.Set Element Size to 0.5mmLocal SizingLocal Sizing Insert Edge Sizing:Select the Edge Selection Filter.The inlet and outlet faces are bound by

18、four edges each.Select one edge on each of the four faces as shown (ctrl left click for multiple selection).Select Extend to Limits to extend the selection to the complete edge loops.In the Outline, right click on Mesh and select Insert Sizing.Check that Geometry contains 16 edges.Set Element Size t

19、o 0.8mm as shown. 1234Local Sizing Insert Edge Sizing (Continued):A preview of the Edge Sizing will be displayed on the geometry. Local sizingInsert Edge Sizing 2:Create another Edge Sizing this time to control the Multizone sweep.Select the edge as shown circled and insert sizing as previously.Unde

20、r Details of “Edge Sizing 2” set Element Size to 2.0mm. Sweep MethodInsert a Sweep Method:The three remaining cylindrical bodies can be swept using the Sweep.Set the Selection Filter to Body , select the three bodies as shown and right click Insert Method.Under Details of “Automatic-Method” change M

21、ethod to Sweep.The Details view will now be named Details of “Sweep Method”.Set Type to Element Size and set Sweep Element Size to 2.0mm. Sweep MethodInsert a Sweep Method (Continued):Set the Source & Target Selection (Src/Trg Selection) to Manual Source.If the box adjacent to Source displays “No Se

22、lection” with a yellow background click in the yellow box to activate.Select the three faces as shown and apply the selection in the box adjacent to Source.Check the Details match those shown. Patch Conforming Tetrahedral MethodInsert Patch Conforming Tetrahedral Method:Use the Body Selection Filter

23、 to select the central body as shown.Right click Insert Method.Under Details of “Automatic-Method” change Method to TetrahedronsThe Details view will now be named Details of “Patch Conforming Method”.Ensure Algorithm is set to Patch Conforming. InflationInflate the MultiZone Method:Right click on Mu

24、ltiZone in the Outline and select “Inflate This Method” from the Context Menu.Under Boundary in Details of “Inflation” select the four faces bounding the MultiZone body and apply the selection. Set Inflation Option to Total Thickness, Number of Layers to 3 and Maximum Thickness to 1.25mm as shown. I

25、nflationInflate the Sweep Methods:Right click on Sweep Method in the Outline and select “Inflate This Method” from the Context Menu.Under Boundary in Details of “Inflation 2” select one edge on each of the three Source Faces as shown.Use the Extend to Limits Tool again to complete the selection.Appl

26、y the selection and Set Inflation Option to Total Thickness, Number of Layers to 3 and Maximum Thickness to 1.25mm as shown.123InflationInflate the Patch Conforming Method:Select the four cylindrical bodies, right click in the Graphics Window and select “Hide Body” (or press F9).This will make bound

27、ary selection easier in the next step.Right click on Patch Conforming Method in the Outline and select “Inflate This Method” from the Context Menu.Under Boundary in Details of “Inflation 3” all faces of the central body must be selected with the exception of those separating the four cylindrical bod

28、ies.InflationInflate the Patch Conforming Method (Continued):Under Details of “Inflation 3” activate the Boundary Selection Box. Apply/Cancel buttons appear when active.In the Graphics Window right click and click Select All from the Context Menu.All faces will be selected.Deselect the four faces as

29、 shown by clicking ctrl left click on each face.Faces will turn blue when deselected.Apply the selection under Details of “Inflation 3” (check 25 Faces are selected).Set Inflation Option to Total Thickness, Number of Layers to 3 and Maximum Thickness to 1.25mm as shown.In the Graphics Window right c

30、lick Show All Bodies.1234Selective MeshingStart Selective Meshing:When combining multiple mesh methods the order in which the bodies are meshed may influence the final mesh characteristics.Generating meshes one by one is called “Selective Meshing”.It is therefore mended that we record the body meshi

31、ng order such that it can be repeated automatically.Right click on Mesh in the Outline and select Start Recording from the Context Menu.If the Worksheet is displayed switch it off using the worksheet Toggle button. Selective MeshingGenerate the MultiZone Mesh:Using the Body Selection Filter select t

32、he MultiZone body. Right click and select “Generate Mesh on Selected Bodies”.The Worksheet will record the operation as Step 1.Switch off the Worksheet and view the mesh.Note how MultiZone has imprinted all source faces onto the target.Press “Show Mesh”. Selective MeshingGenerate the Sweep Meshes:Se

33、lect the three Sweepable bodies.Right click and select “Generate Mesh on Selected Bodies”.This operation is again recorded in the Worksheet, this time as Step 2. Selective MeshingGenerate the Tetrahedral Mesh:Select the central Tetrahedral mesh body.Right click and select “Generate Mesh on Selected

34、Bodies”.All three steps are now recorded in the Worksheet. Create a Section Plane:In the Graphics Window, right click and select View Front to align the view to +Z Axis.Click the New Section Plane button.Click and drag the cursor through the model as shown from top to bottom.Align the model to +X Ax

35、is (Right click View Right).Note the continuous and conformal mesh & inflation between methods. View Mesh InteriorCreate a Section Plane (Continued):Switch off Section Plane 1 and Align the model to -X Axis (Right click View Left).Click the New Section Plane button.Click and drag the cursor through

36、the model as shown from top to bottom.Restore the view to the +Z Axis (Front).Note the swept MultiZone mesh.Switch off all Section Planes.View Mesh InteriorCheck QualitySet a Mesh Metric:Under Details of “Mesh” expand the Statistics Menu and set Mesh Metric to Orthogonal Quality.Note the value of Min Quality (your values may vary from values shown below) Check QualityUse the Mesh Metrics Graph to View Quality Ranges:Click the Co