[MathTrot]

I am trying to use 3D free blocks to reduce the number of cells around a square cylinder mesh. As the mesh will be used in DDES I need to be able to expand the size of my elements outside the fine zone in the wake of the cylinder without using an interface. Here’s a look at the blocking I use. The zone near the cylinder is an O-Grid and the zone corresponding to the wake of the cylinder is a high density cubic region. Both of these regions are structured meshes.

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When I try to build 3D free blocks, I start by changing all exterior blocks (all except the two structured zones) to type free. Note that the inside edges already have the correct dimension and because it’s a mapped blocking exterior edges have the same number of nodes.
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After I change all exterior free blocks faces to free with “Convert free block face to free”.
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While regenerating the pre-mesh, I receive a license error. Is this a feature that requires another license?
4.GIF
The pre-mesh obtained after the regeneration seems to only contain one free block while others are empty. I exported the pre-mesh to mesh and then to fluent and there is no mesh in the empty zones. Also, depending on the regeneration I do, it is not always the same block that shows up! I would like to know if there is another way to do the mesh I want or how to solve my 3D block problem? Thanks in advance.
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