I’m now attempting to refine a mesh based on best practices from @retsam which worked very well. Unfortunately I’m consistently getting a mesh error. The SimScale front end gives me the following error: The mesh did not pass validity checks. Increasing the mesh fineness or adding local refinements to geometrical details potentially fixes this issue. Please contact our support for further assistance.
However when I go into the meshing log, I see a series of iterations removing illegal faces until this is reached:
Hi @jhartung; I see you run now simulation after simulation and dare to cancel them as well. Very good!
In your mesh log you should pay attention on results of Boundary layer report near the meshing log end. You have a lot of tiny faces, quite few are not having the benefit of going to 5 bounding layers extension (you should expect something like 4-5), hence a risk that some regions could impact simulation quality. It looks like that (fragment):
As I do not know what validity checks are really doing, this is a hint only about possible culprit. I suppose you can find some additional information on Inflating boundary layers in other forum posts.
Thank you @Retsam. When you point these things out, they seem really simple.
Here’s the best forum post I could find for proper y+
In fact, I was probably several orders of magnitude too thick on my boundary layer. I made the simple excel calculator there and ended up with the final layer thickness as a function of expansion ratio and y+=1 for my reference length from the calculator here: http://www.pointwise.com/yplus/