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[ICEM] negative sector volume

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Old   August 9, 2014, 00:24
Default negative sector volume
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Hi, I ran into a problem that I don't have a good solution.
I generate a very complicated mesh in icem and import to CFX. CFX simulation can run, but always gives a warning like this.

ERROR #002100011 has occurred in subroutine cVolSec. |
| Message: |
| A negative SECTOR volume has been detected. Execution will proceed |
| but this is a possible cause of robustness problems. |
| The location of the first negative volume is reported below. |
| Volume : -0.1090E-11 |
| Location : ( 0.46778E+02, -0.90059E-01, -0.22054E+00) |
| This warning may be made fatal by setting the expert parameter |
| 'negative volume option = 1'.


I can use the coordinates to find the bad element and fix it manually in ICEM. However, I want to know how many elements have this kind problem before I can go ahead do it. If it is like 10 problematic elements, I can do it. If there are hundreds of problematic elements, I have to figure out some new method to generate mesh.

Looks like CFX only gives you the coordinate information of one problematic element (the FIRST negative volume....). How can I know all of them in one shot?

Also, I found all those problematic elements are flat tets elements. Can I use smoothing function in ICEM to fix them? And which quality parameter should I use, quality, aspect ratio, skew or something else?

Thanks a lot
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