CFD Online Discussion Forums

Mesh quality criteria in ICEM

Posted November 23, 2012 at 09:18 by diamondx

First of all these values are relative. There are many values which are not acceptable to Fluent but CFX. For example fluent is more tolerant of angle issue than the CFX. But Fluent does not like the pyramid shape and CFX does not mind it because of its internal working.

Keeping in view they have (meshing guys) have devised some metrices with factor of safety. Following are the most important quality metrics with thier range.

Angle : Must be greater than 18 deg (But...

diamondx

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Sure, there is definitly a better way.

Posted November 22, 2012 at 12:09 by diamondx

Quote:

Originally Posted by PSYMN

Yes, of course, a better surface mesh leads to a better volume mesh.

I go to the smooth or mesh quality and run my check… This creates a histogram in the bottom right corner. You can adjust the range of the histogram if it is too hard to see the lowest columns. Left click on columns to display the mesh from each column on the screen (track lightly as this may be memory/display intensive). Right click on the histogram to create a subset of the elements in the highlighted

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more info about faceted surfaces...

Posted November 22, 2012 at 11:35 by diamondx

Quote:

Originally Posted by PSYMN

Surface geometry kernel is just the part of the code that handles its native geometry. ICEM CFD's geometry kernel supports two primary geometry types, faceted and bspline...

Faceted geometry is made up of lots of little triangles. This data can come from scanners or some low end geometry creation tools. These usually give a rough interpretation of the surface. Common types include, STL, VRML and various mesh types which can be used as geometry. Some CAD formats, such as DXF,

...

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How to slove "temperature limited to 1.0000e+00001 in cells.."

Posted November 22, 2012 at 11:11 by diamondx

This might happen early in your solution, but it should go away as you iterate. What happens is that FLUENT calculates some value that is below 10 K, which is (probably) unreasonable. To keep the simulation from diverging, it discards the value it calculated and uses 10 K insead.

If the warning does not go away as you iterate, try to find where the offeding cell is. You can do this by going to the adapt by iso-value menu and selecting adapt by temperature. Pick a range of temperatures...

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