09 Anchor Mesh PAT301

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PAT301, Workshop 10, December 2005

Copyright 2005 MSC.Software Corporation

WORKSHOP 10Tetmeshing Anchor Geometry andVerifying Mesh Quality


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z Workshop Objectives

z Create a tet mesh using the auto tet mesher, TetMesh. See theeffect of two TetMesh parameters on the mesher by re-meshingand changing the value of the parameters. For both meshesdetermine the quality of the tet elements.

z Problem Descriptionz Tet mesh using TetMesh with the approximate element size of

20.0 or 0.5

z Determine the quality of the tet elements

z Software Version

z MSC.Patran 2005r2


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z

Key Concepts and Steps:z Database: open an existing database

z Elements: create a tet mesh using the element size of 20.0

z

Elements: look for free element facesz Elements: determine the quality of the tet elements

z Elements: create a tet mesh using the element size of 0.5

z Elements: determine the quality of the tet elements


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Step 1: Open Database

Open existing database

Anchor.db

a. File/Open.

b. Select Anchor.db.

c. Click OK.

a

b

c


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Step 2: Tet Mesh Geometric Solid

Mesh the solid.

a. Elements: Create / Mesh/

Solid.b. Select Tet forElem

Shape.

c. Select TetMesh for

Mesher.

d. Select Tet10 for

Topology.e. Use default values for

TetMesh Parameters

f. Select Solid 1 forInput

List.

g. Enter20.0 forValue of

the Global Edge Length.h. Click Apply.

i. Click Smooth Shaded

icon.

a

bc

d

e

g

f

h

i


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Step 3: Verify Boundaries

Look at the free faces of the tet

elements.

a. Elements: Verify /

Element / Boundaries.

b. Select Free Faces forDisplay Type.

c. Click Apply.

a

b

c


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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

S 4 D i El Q li U i All T (C )


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Step 4: Determine Element Quality Using All Tests (Cont.)

Results of quality checks.

a. Test performed

b. Number of elements that failed

test

Results of quality checks.

c. Poorest quality check result

d. Element that had poorest

quality check result

a b c d

St 5 El t A t R ti U i F i Pl t


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Step 5: Element Aspect Ratio Using Fringe Plot

Create a color fringe plot for the tet

element aspect ratio..

a. Element: Verify / Tet /

Aspect.

b. AdjustAspect Ratio to a

value near5.

c. Click Apply to obtain the

fringe plot of aspect ratio.

d. Click View Cornericon

and drag to show close-up

view.

a

b

c

d

d

St 6 R T t M h G t i S lid


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Step 6: Re-Tet Mesh Geometric Solid

Re-mesh the solid to try to create an

improved mesh.

a. Elements: Create / Mesh /

Solid.

b. Select Tet forElem Shape.

c. Select TetMesh forMesher.

d. Select Tet10 forTopology.

e. Click TetMesh Parametersf. Enter0.05 forMaximum h/L.

g. Enter0.1 forGlobal Edge

Length multiplier.

h. Click OK.

i. Select Solid 1 forInput List.

j. Enter20.0 forValue.

k. Click Apply.

l. ClickYes for delete the existing

mesh on Solid 1.

a

bcd

e

g

f

h

i

j

k

Step 7: Element Quality Using All Tests for New Mesh


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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.

Step 8: Quit MSC Patran


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Step 8: Quit MSC.Patran

Quit MSC.Patran

a. Select File on the Menu Bar

and select Quit from the drop

down menu

a


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09 Anchor Mesh PAT301

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