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[ICEM] Tri-Shell growth ratio

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Old   January 21, 2013, 10:27
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Johannes Ringborn
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Hello,

is there an option in ICEM to minimize the standard growth ratio of a "Patch-Independent-All Tri" surface mesh?

Best regards
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Old   January 21, 2013, 10:34
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Sijal Ahmed Memon (turboenginner@gmail.com)
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I am also looking for this option. May be size function can help...!!!
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Old   January 22, 2013, 03:52
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From the documentation for ANSYS ICEM CFD 14.0 :

Tetra Size Ratio
controls the growth (edge length) of tetra mesh as it moves away from the surface.

For Octree Tetra mesh, size transitions are 2 to 1 locally, but you can still affect the transition rate over a larger number of transitions. For example, if the surface size is 2 and the volume size is 64, you may see something size transitions like the following:

Delaunay 2 3 4.5 6.75 10.13 15.19 22.78 34.17 51.26 76.89
Octree 2 2 4 4 8 8 16 32 32 64

If the ratio was 1.5, the big picture would show both the Octree and Delaunay sizes growing at a rate of 1.5, but the Octree method has to fit it to powers of 2 times the smallest size in the model. Also, you can imagine that changing this to 1.4 or 1.6 might not make that much difference to the Octree mesher, at least not for the first few layers, but would directly change the Delaunay progression.
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Old   January 22, 2013, 05:12
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Quote:
Originally Posted by j_h_86 View Post
Hello,

is there an option in ICEM to minimize the standard growth ratio of a "Patch-Independent-All Tri" surface mesh?

Best regards
Quote:
Originally Posted by BrolY View Post
From the documentation for ANSYS ICEM CFD 14.0 :

Tetra Size Ratio
controls the growth (edge length) of tetra mesh as it moves away from the surface.

For Octree Tetra mesh, size transitions are 2 to 1 locally, but you can still affect the transition rate over a larger number of transitions. For example, if the surface size is 2 and the volume size is 64, you may see something size transitions like the following:

Delaunay 2 3 4.5 6.75 10.13 15.19 22.78 34.17 51.26 76.89
Octree 2 2 4 4 8 8 16 32 32 64

If the ratio was 1.5, the big picture would show both the Octree and Delaunay sizes growing at a rate of 1.5, but the Octree method has to fit it to powers of 2 times the smallest size in the model. Also, you can imagine that changing this to 1.4 or 1.6 might not make that much difference to the Octree mesher, at least not for the first few layers, but would directly change the Delaunay progression.
.

@Broly: Yes it is. But I think he is looking for surface mesh growth.
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Old   January 22, 2013, 05:25
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Quote:
Originally Posted by Far View Post
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@Broly: Yes it is. But I think he is looking for surface mesh growth.
Yes, as Far has indicated, I am looking for an option to modify the growth ratio of the surface mesh.

But anyway-thank you Broly for your answer!
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