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[ICEM] Transition layers from quad (or hexa) coarse mesh to quad (or hexa) fine mesh?

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Old   December 4, 2012, 19:36
Default Transition layers from quad (or hexa) coarse mesh to quad (or hexa) fine mesh?
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François Grégoire
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Hi,

Is it possible to build a quad (or hexa) transition mesh like the mesh in the attached image? Not necessarily a right-angled mesh, but a somewhat structured quad (or hexa) transition mesh, preferably with blocking. Can Fluent handle that kind of mesh? (my first guess is no...)

Thanks ahead,
François
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Old   December 4, 2012, 23:17
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Sijal Ahmed Memon (turboenginner@gmail.com)
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It is possible to make the similar mesh in ICEM Hexa. Just choose the refinement factor (1:2, 1:3 etc). But Fluent only accepts the factor 1:2 in adjacent cells, so getting similar mesh as in ICEM you need to make as many blocks as there is transition in the model. Got it?

Just an example, I can judge from pic, you need alteast 4 blocks to get the similar mesh.
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Old   December 5, 2012, 10:52
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Ok, I got the mesh refinement in Icem with Blocking => Pre-Mesh Params => Refinement... see attached image. The problem is the export to Fluent, I get various errors because of the bad coupling between blocks. Do I have to edit the Blocking mesh (Blocking => some operation...) or the converted unstructured mesh (Edit Mesh => some operation...)? I didn't find a way to export a .msh without errors.
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Old   December 5, 2012, 10:55
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you should try this on the 3d case!!!. Because this is known problem for the 2d case and already discussed on the forum with simon.
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Old   February 10, 2014, 07:09
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The step-wise refinement is potentially quite usefull. But it quickly becomes tedious to create new blocks for every additional level of refinement (to be compatible with Fluent). Is there a way to do so automagically?

So for example:
Select block to be refined;
Select ref. dimension;
Select ref. factor;
Select maximum step change (which would then be 2).

Which would then result in a transition like in François' OP.

(I realize this is an old thread. But since I landed here with google, and this is directly relevant, hopefully you don't mind me reviving.)
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