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

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

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.

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.

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.

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.)