How to Coarsen Mesh in Selected Block
 

Hello Everyone,

I am trying to coarsen the mesh in a selected block. The ICEM manual tells me I can:
Use Blocking > Pre-Mesh Params > Refinement to refine or coarsen the mesh. You can apply the refinement/coarsening in all three major directions simultaneously or in just one major direction.
Refinement
To refine the mesh, enter a scale factor greater than 1.
Coarsening
To coarsen the mesh, enter a scale
factor less than 1.

I go to the refinement option and enter a scale factor less than 1 (see screenshot where I used 0.5), but it gives me an error and tells me that the factor must be positive.

Am I missing something? Thanks in advance

I have found a solution.

I input 1/2 rather than 0.5 and it worked.

Edit: it seems to not like when I use a factor of 1/3 and gives me warnings as attached. What do they mean?

I am able to use 3X refinement in the opposite direction.

That is just warning to hanging elements. Refinement "1/2" is for Fluent mesh. An "1/3" refinement is for CFX mesh. Look in Help on subsequent command "Edit Mesh > Merge Nodes > Merge Meshes".

Hello Ludvik,

Thanks for your reply.

I do intend to use the mesh in CFX. When I go through with the 1/3 refinement, the program actually closes on me, saying there is a segmentation violation. Would this still be due to the hanging nodes?
If I use 'Resolve Refinements', would that warning not appear?

The mesh refinement in Blocking really produce uncorrect mesh for CFX.
Switch Premesh to Unstructured Mesh and use tool "Merge Mesh, Method: Resolve Refinements" to solve this.

Hello,

Could you please describe what you meant when you said the mesh it would produce would be incorrect?

Word "incorrect" isn't exact, better is "impractical". In a model are too many Mesh Interfaces, who consumes time for creating model, computational time, .. .

Hello Ludvik,

Thank you for the additional information/clarification