[newOpenfoamUser]

Hi,

I wonder whether there is a general guideline on how to set the under-relaxation factors and how to decrease it step-by-step? I saw in some tutorials that in simpleFoam, it is advisable to set the under-relaxation factors for U and p to be 0.7 and 0.3 respectively. However, when that fails, how would you decrease them step-by-step? Is it advisable to reduce them together? Is there a way to check which one is causing the solver to diverge so that we can just reduce the under-relaxation factor for that particular quantity alone. Also, is there a lower bound where you should not decrease the under-relaxation factors beyond that?

Thanks!