My friend Mantovani wants to build a Backward Facing Step flow simulation that includes an LES model.
Here is some guidance on meshing for LES that Mantovani found:
Here I applied the concept of Adapted Mesh that preserves aspect ratio to the backward facing step problem.
The first image shows the length of the inlet to the step. The length to the outlet from the step is much larger.
The second image shows the mesh details around the step.
While the element sizes for this illustration may be far too large for a good result, they can be easily reduced to a proper size.
Any comments from the community are welcome.
Attached is an ANSYS 19.0 archive.