[skris2009]

Hi
I'm looking to create a completely structured (preferably body aligned) grid for a circular-to-rectangular transition duct, i.e. a duct with a circular inlet, undergoes a shape transition to end in a rectangular outlet. I'm looking at high speed flow (Re~400,000) of air through this duct.

I tried using Gambit, but I'm not satisfied with the grid, as I need to use a 'pave' mesh for the circular end.

In Gridgen I can create a polar mesh for the circular end. But as I progress towards the rectangular end, I want to be able to use a Cartesian mesh. Is there any way I can do this? Currently, I am starting at the polar mesh end, creating many small blocks, until I get to the rectangular end, but this yields a very poor mesh in the transition region (which is the main area of interest.) I have also tried starting at the middle and proceeding towards either end, but the grid is not body aligned.

Bottom line: Is there any way in Gridgen, I can give a polar mesh at one end, select the faces (or domains) that form the volume, and allow Gridgen to extrude the mesh from polar to cartesian?

I will appreciate any ideas that come up. Many thanks in advance.