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Does Ansa have a "volume skew" criterion equivalent?

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Old   May 13, 2022, 14:03
Default Does Ansa have a "volume skew" criterion equivalent?
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Hi,
I am trying to reduce the number of tet elements that fail a certain criterion in Hypermesh (about 1% of my mesh). This criterion is called "volume skew" (with a value of 0.9) in hypermesh, but I am trying to modify the mesh in Ansa, so I need to be able to select the equivalent of what this criterion is in Ansa. This is the hypermesh definition of "volume skew" https://ibb.co/VvQFZBc

The first thing I tried in Ansa was to use "Skewness" for solids, but looking at the description below, you can see that it seems different, and it gave me wrong/opposite results when I tried to fix the elements. https://ibb.co/ZGj1Jjb. Essentially, the more elements I fixed in Ansa using this criterion, the more failed elements I got in hypermesh when re-checking, making my mesh worse.

The second thing I tried in Ansa was to use "h-ratio" for solids https://ibb.co/KjWrKNN, but when I use a value of 0.9, the entire mesh is highlighted as failing the criterion, instead of just a portion of them (should be about 1% according to hypermesh).

Any help is appreciated.
Thanks,
Jazmine
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Old   May 14, 2022, 13:07
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Maries
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Hi,

For skew, I believe fluent skew in Ansa has similar definition.
In ansa quality criteria, go to solids tab, enable only skew and go to dropdown and select fluent. You can see the quality criteria definition by hovering the mouse over that quality.

Maries
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Old   May 17, 2022, 18:30
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Quote:
Originally Posted by rmaries View Post
Hi,

For skew, I believe fluent skew in Ansa has similar definition.
In ansa quality criteria, go to solids tab, enable only skew and go to dropdown and select fluent. You can see the quality criteria definition by hovering the mouse over that quality.

Maries
Hi,
Thanks for replying. Changing the Skewness definition from Nastran to Fluent made the criteria definition match what I was looking for.

-Jazmine
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Old   May 19, 2022, 07:42
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Yes. they have separate quality crieteria for surface elements & Volume elements. Press F11 the menu will open, you can see shells and solids in different tabs.
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element quality, hypermesh, skewness, tet mesh, tetrahedral mesh

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