Problem with boundary layer - high skewness
 

Hello, everyone! I'm asking for help with a GAMBIT problem. Trying to create boundary layer on volume but it results with high skewness.

I don't think it's possible to slice this volume into smaller parts. (Actually it is a part of much more complex case). Trying different surface mesh schemes didn't help as well as trying to change defaults for BLAYER.

What I cannot understand is why it doesn't preserve thickness of boundary layer, because even if I managed to reduce skewness <0,97 a layer is still too thin in some areas.

I'm out of ideas, please, suggest something...:confused:

yoou have to be sure that your problem comes from the BL.
For that, delete the BL and mesh your volume.

As I see you your surface mesh, I suppose you want to mesh your volume with hexa. With such a topology, you won't be able.
You have to split your volume.
check this tutorial: https://www.sharcnet.ca/Software/Gam...guide/tg03.htm

Thank you very much for this tutorial. I somehow missed it.
I don't want to mesh this volume with hexa, I only want a hex BL. However now I see it's unlikely to get a good layer without splitting the volume.

Ok if you don't want hexa volume, mesh your surface mesh with tri elements.
Your BL will be prismatic.
It should fix your problem.
Then mesh your volume with tet/hexcore (core of your volume with hexaeders)

I tried triangular meshing and it didn't help. I fiured out that increasing mesh density and thickening BL rows can partly resolve the problem. Of course, the right way is to split the volume but I don't have much time so I'll put up wth it, thank you again.