[mcclud]

I am trying to generate a mesh to run with k epsilon, high y+ model. The geometry is a channel that resembles an 'H'. I am modelling only 1/4 of the channel since the geometry has two symmetry planes. The mesh I have is attached. The bottom most and left most boundaries are symmetry planes while the other four are wall boundaries.

My goal is to generate a structured grid of hexahedral cells using the trimmer. I am having trouble ensuring that the trimmer places my chosen base cell size at the wall boundaries. You will see in the picture that the cells adjacent to the top boundary are much smaller than the others. Since I want to use high y+ model, the near wall cell centroid's need to be at ~y+ = 30, I need to control the thickness of the wall layer.

I have aligned the mesh, and the origin of the coordinate system is at the bottom right corner of the mesh. I have also tried using the prism layer because of the control it gives in the near wall region, but since my geometry is well suited to hexahedral cells, I wanted to pursue a mesh generated with the trimmer only.

So my question would be, is there any way to control the trimmer's generation of the wall layer?

Any help would be great.