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Mesh density dependent on direction

Mesh density dependent on direction

Mesh density dependent on direction

(OP)
Hi Guys

I've been trying to model a lake about 300 meters long in Ansys CFX. I know this is a very large object, and in reality it is even bigger but I have scaled it down as the program wouldn't let me make something 6 kilometers long.
If anyone knows a software package better than Ansys to do this in I'm all ears, but as Ansys is the only one known to me at this time that is what I've been using.

I've run into a problem, that in some shallower areas the lake's depth is only the size of one mesh, so you get a single mesh in the vertical direction between the two boundaries, which is obviously unphysical, so I've been getting inconsistent results in these areas.

What I would like to do is make the mesh size dependent on cartesian direction, so in other words is it possible to have a sort of rectangular mesh, such that I could have say a mesh size average of 0.5 m in the Y direction, and then 3 m size in the x and z directions. I know I could just make them all 0.5 meters but due to the size of the lake this just gets way out of hand and the computer can't handle it!

Any help would be much appreciated!

Summary: Modelling shallow lake, want mesh density to be greater in one direction than others to correctly model depth.

Thanks again!

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