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improving quality after merging tetra and prism

Posted December 1, 2012 at 09:19 by diamondx

you can only merge meshes if one side is all tetra... It needs the flexibility of the tetra mesh make it work. Prisms are too restrictive. We are working on ways to improve this situation.

Prism quality looks worse than it is... No worries there either.

As for the poor tetras, run the smoother with the prisms and hexas frozen... see what it can do. It should fix most tetras. The tetras it can't fix are those that are stuck between close layers of prisms... ...
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Old

Best Mesh Generation Software

Posted December 1, 2012 at 06:59 by Far

Rule of thumb:

1. Use the mesh generator which is being used by your friends who are available to help you out.

2.Best sotware in market is ICEM (Hexa), but it is difficult to learn and takes alot time in mastering. Its tetra + prism version is very efficient and easy to use.

3. Ansys meshing is new technology and very easy to use.

4. Gambit is very easy to learn and its tetra with boundary layer (in 3d implementing boundary layer often...
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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...
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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 View Post
Yes, of course, a better surface mesh leads to a better volume mesh.



I go to the smooth or mesh quality and run my checků 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 View Post
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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