Steady state heat transfer simulation convergence
 

Hi,

I am quite new to CFD so some suggestions on this would be appreciated. I am trying to perform a mesh sensitivity study. At the moment, I have made an initial mesh with suitable metric values for orthogonality, skewness and aspect ratio, and the like. However my solution has not converged with this initial mesh, but could this be because my mesh has not converged? or because of other aspects such as under relaxation? So it got me thinking: should I achieve solution convergence before mesh convergence or during?

Because when doing a mesh sensitivity study, shouldn't I only change the mesh density and no other things such as the under relaxation factors? Not sure what order to do this in.

Thank you

No, mesh sensitivity study has to be done only on converged solutions

I agree with LoGal.

A good quality mesh (no small/bad elements) should not cause non-convergence. A coarse mesh should still converge, but will have a large error compared to the correct solution. The goal of a mesh sensitivity study is to reduce this error, not achieve convergence.

It is much more likely that your boundary conditions, solver settings, etc. are causing the problem with convergence. Without much detail of your setup it is hard to speculate what is causing the issue.

Thank you both. This is what I needed to know