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WS10-1PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
WORKSHOP 10Tetmeshing Anchor Geometry and
Verifying Mesh Quality
WS10-2PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
WS10-3PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Workshop ObjectivesCreate a tet mesh using the auto tet mesher, TetMesh. See the effect of two TetMesh parameters on the mesher by re-meshing and changing the value of the parameters. For both meshes determine the quality of the tet elements.
Problem DescriptionTet mesh using TetMesh with the approximate element size of 20.0 or 0.5Determine the quality of the tet elements
Software VersionMSC.Patran 2005r2
WS10-4PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Key Concepts and Steps:Database: open an existing databaseElements: create a tet mesh using the element size of 20.0Elements: look for free element facesElements: determine the quality of the tet elementsElements: create a tet mesh using the element size of 0.5Elements: determine the quality of the tet elements
WS10-5PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 1: Open Database
Open existing database Anchor.db
a. File/Open.b. Select Anchor.db.c. Click OK.
a
b
c
WS10-6PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 2: Tet Mesh Geometric Solid
Mesh the solid.a. Elements: Create / Mesh/
Solid.b. Select Tet for Elem
Shape.c. Select TetMesh for
Mesher.d. Select Tet10 for
Topology.e. Use default values for
TetMesh Parameters…f. Select Solid 1 for Input
List.g. Enter 20.0 for Value of
the Global Edge Length.h. Click Apply.i. Click Smooth Shaded
icon.
a
bcde
g
f
h
i
WS10-7PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 3: Verify Boundaries
Look at the free faces of the tetelements.
a. Elements: Verify / Element / Boundaries.
b. Select Free Faces for Display Type.
c. Click Apply.
a
b
c
WS10-8PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 4: Determine Element Quality Using All Tests
Determine the quality of each tet element.a. Element: Verify / Tet / All.b. Click Apply.c. See spread sheet on next page,
Continued…
a
b
WS10-9PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 4: Determine Element Quality Using All Tests (Cont.)
Results of quality checks.a. Test performedb. Number of elements that failed
test
Results of quality checks.c. Poorest quality check resultd. Element that had poorest
quality check result
a b c d
WS10-10PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 5: Element Aspect Ratio Using Fringe Plot
Create a color fringe plot for the tetelement aspect ratio..
a. Element: Verify / Tet / Aspect.
b. Adjust Aspect Ratio to a value near 5.
c. Click Apply to obtain the fringe plot of aspect ratio.
d. Click View Corner icon and drag to show close-up view.
a
b
c
d
d
WS10-11PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 6: Re-Tet Mesh Geometric Solid
Re-mesh the solid to try to create animproved mesh.
a. Elements: Create / Mesh / Solid.
b. Select Tet for Elem Shape.c. Select TetMesh for Mesher.d. Select Tet10 for Topology.e. Click TetMesh Parameters…f. Enter 0.05 for Maximum h/L.g. Enter 0.1 for Global Edge
Length multiplier.h. Click OK.i. Select Solid 1 for Input List.j. Enter 20.0 for Value.k. Click Apply.l. Click Yes for delete the existing
mesh on Solid 1.
a
bcd
e
g
f
h
i
j
k
WS10-12PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 7: Element Quality Using All Tests for New Mesh
Original Mesh Re-Mesh
The tables above illustrate the differences between the first mesh and the re-mesh. Observe the large improvements made in each of the characteristics of the model after the remesh.
WS10-13PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
Step 8: Quit MSC.Patran
Quit MSC.Patrana. Select File on the Menu Bar
and select Quit from the drop down menu
a
WS10-14PAT301, Workshop 10, December 2005Copyright© 2005 MSC.Software Corporation
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