# [ICEM] Similar tetra refinement

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 June 22, 2011, 10:37 Similar tetra refinement #1 New Member   Andreas P Join Date: Sep 2010 Posts: 26 Rep Power: 6 Hi all! Somehow I can't believe I need to ask this because it seems trivial, but we are not getting the solution we want, so here's the question: We have a 3D mesh consisting purely of tetra elements. Now we want to refine this complete mesh with a similarity approach. That means, each tetra of the old mesh should be subdivided into 8 new ones, which are all similar to their "father". Thus, each edge should be split at its center into two new ones. The newly created nodes shall NOT be projected to the geometry surfaces. They should just stay at the same place where the former edge center used to be. To me this really seems to be the simplest mesh refinement one could do. But how is it possible with ICEM??? Any help is appreciated! Andreas

June 22, 2011, 11:21
#2
New Member

Andreas P
Join Date: Sep 2010
Posts: 26
Rep Power: 6
Maybe to shed a little more light on that issue:

We have tried the "Pure mesh refinement" method from the refine/coarsen menu. See the attached pngs for an example.

For the element marked in blue, the method seems to do what we want. At least the marked triangle is split into 4 as we desire.

However, the red element is refined awkwardly. Why? Do we have to explicitly tell ICEM to use the most simple dividing algorithm? If so, how can we do it?

Again, thanks in advance for any help!
Attached Images
 non-refined.jpg (30.1 KB, 40 views) refined.jpg (32.9 KB, 35 views)

 June 24, 2011, 12:35 Different way to get there... #3 Senior Member     Simon Pereira Join Date: Mar 2009 Location: Ann Arbor, MI Posts: 2,662 Blog Entries: 1 Rep Power: 35 Under change mesh type, you could "add midside nodes". Turn off projection so they won't snap to surface. Then "remove midside nodes" and use the option to convert to multiple linear elements... It should give you exactly what you want. __________________ ----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey

 June 27, 2011, 04:22 #4 New Member   Andreas P Join Date: Sep 2010 Posts: 26 Rep Power: 6 Perfect, that did the job! Thanks!

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