Tinkering some more with snappyHexMesh

Getting consistent layers is possible

Most people struggle to generate layers predictably with snappyHexMesh.

So much so, they leave it for another, often commercial alternative.

Always start with a refined mesh near the walls, SHM did a good job with the distance refinement for the defined wall regions

But I haven’t given up on it.

You see, over the years I’ve been coming back to it, mostly because I like tinkering with tools. I always have!

I usually get a good mesh out of it, but lately I’ve been pushing it to its limits (and my 32GB machine memory!)

I’ve only generated 3 layers here, but this setup proved that cell refinement makes a significant difference to layer growth

Next, I wanted to test further corner refinement, trying to get as close as possible to the corners.

Now, this was an interesting revelation…

Left to right, snapped to layered…

The same 5 layers requested and generated but compressed in a smaller space, given the smaller cells.

SHM will scale the whole layer stack.

But, the transition cells / layers is quite abrupt here, so a stepped refinement would help.

I plan to continue my practical experiments, develop my SHM insight tool and write here and on LinkedIn about them, so do subscribe and follow.

Hope you’ve learnt something.

Have a great week!
Nasser

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