Hi Rajan (@smittag)!
Some posts that might be helpful here:
-
Popular Errors of Simulation\rightarrow Already posted by Barry above
The second link is quite useful. Some general hints regarding the relaxation factor:
-
If you have to change the under-relaxation factor(s), start by decreasing the values of
the under-relaxation factors in order to improve the stability of the solution -
A low under-relaxation factor will slow down the solver while high under-relaxation
factor will speed up the computation but result in instabilities
\rightarrow As always trial and error will be the way to go but be careful when using such settings as the physics might not be represented correctly.
If you are more interested into the physics and the OpenFOAM page is not satisfying enough you can come back and we will help you out.
Best,
Jousef