effect of global and local controls on mesh size and quality workshop 4.1 ansys meshing ...
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4-1ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Effect of Global and LocalControls on Mesh Size andQuality
Workshop 4.1
ANSYS MeshingApplication Introduction
Common Mesh Controls
4-2ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualGoals
• This workshop will illustrate the use and effect of global and local mesh sizing controls including use of the Curvature and Proximity features in the Advanced Size function
• The geometry has both thin-walled regions and regions of high local curvature
Common Mesh Controls
4-3ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualSpecifying Geometry
1. Copy the tee.agdb file from the
files folder to your working directory
2. Start Workbench and double-click
the Mesh entry in the Component
Systems panel at the right
3. Right-click on Geometry in the Mesh
entry in the Project Schematic and
select Import Geometry/Browse
4. Browse to the tee.agdb file you
copied and click Open
5. Note that the Geometry entry in the
Project Schematic now has a green
check mark indicating that geometry
has been specified
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualMeshing Options
7. Right-click on Mesh and click Edit to
open the Ansys Meshing
8. *On the Meshing Options Panel at the right,
set the Physics Preference to Mechanical and the Mesh Method
to Patch Conforming Tetrahedrons and click OK.
9. Look in the Mesh Outline and verify that the
Patch Conforming Method has been assigned to the single body
in the geometry
*Note: If you are using ANSYS V14.0 or more recent versions of
ANSYS then you will not see the Meshing Options panel at the
start of ANSYS Meshing. You will still be able to set the Physics
Preference and insert any Mesh Methods manually.
Common Mesh Controls
4-5ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualDefault Mechanical Mesh
10. Left click on Mesh expand the Sizing and
Statistics Entries. Select Skewness as the
Mesh Metric. Right click on Mesh and
Generate the Mesh. Note the coarseness
of the mesh and the statistics.
Common Mesh Controls
4-6ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualCFD Mesh
11. Change the Physics Preference to CFD
and the Solver Preference to Fluent.
Verify that the Advanced Size Option is
set to Curvature
12. Right-click on Mesh and generate the
mesh. Notice the much finer mesh and
the improvement in the mesh metric.
Common Mesh Controls
4-7ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualSection Plane
13. Orient the Model view so that it is edge on as
shown. Click on the new section plane icon
14. Draw a section plane that splits the model
down the middle. Orient the view so that it is
parallel to the axis of the tee. Click on the
Show Whole Elements icon. Note that there
is only one element through the thickness of
the thin regions
Common Mesh Controls
4-8ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved.
April 28, 2009Inventory #002645
Training ManualAdding Proximity Sensing
15. Click in the Use Advanced Size Function and change
the setting to On: Proximity and Curvature. This will
add proximity sensing to the meshing algorithm.
16. Leave the view as is with the Section Plane active.
Generate the mesh again (this will take some time).
Note that there are now multiple elements across the
thickness and the large increase in mesh count.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualIncreasing the Minimum Size
17. Click in the Minimum Size box in the Mesh Settings
and enter 0.005 for the Min Size.
18. Regenerate the mesh Note that there are still
multiple elements across the thickness but the mesh
count is considerable smaller.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualUsing a Face Sizing
19. Set the Advanced Size Function back to
Curvature and toggle off the section plane
20. Right-click on the mesh entry in the
Outline and insert a Sizing. Pick the
outer cylindrical face as shown and click
Apply.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualFace Sizing
21. Set the element size to 0.005 [m]. Regenerate the
mesh. Notice that the mesh on the selected face is
finer than the mesh on adjacent faces.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualFace Sizing
22. Toggle the Section Plane back on and orient the view so that it is parallel to the
axis of the tee. Note that there are only multiple elements through the thin sections
where the face sizing is active
Common Mesh Controls
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Training ManualCoodinate System for Sphere of Influence
23. Right click on Coordinate Systems and insert a
Coordinate System. Set the Define By option to Global
Coordinates and enter [0 [m], 0.1 [m], and 0.08 [m])
as the Origin X, Y, and Z. With the Section Plane toggled
off, the coordinate system should appear as shown
below.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualBody Sizing (Sphere of Influence)
24. Suppress the Face Sizing via a right-click.
25. Right click on Mesh and insert a Sizing. Pick the Body
and set the Type to Sphere of Influence. Click in the
Sphere Center entry box and select the Coordinate
system you created.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualBody Sizing
26. Set the Sphere Radius to 0.01 [m] and the Element Size
to 0.005 [m]. The model display will update to preview
the extent of the Sphere of Influence.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualBody Sizing
27. Regenerate the mesh with the Section Plane toggled off.
Note the limited extent of the Sphere of Influence.
Common Mesh Controls
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April 28, 2009Inventory #002645
Training ManualBody Sizing
28. Toggle the Section Plane back on and rotate the view so that it is parallel to the
axis. Note there are only multiple elements through the thin regions near the
Sphere of Influence.