Divergence in AMG Solver: every time at certain flow time
 

Hi all,

Am running a propeller simulation in Fluent 16.2 and am getting the following error:
Divergence detected in AMG solver: pressure correction -- Turning off correction scaling!
Divergence detected in AMG solver: pressure correction -- Increasing relaxation sweeps!

The error happens at a certain flow time (after many oscillations which go fine without a problem, all residuals convergence before the certain error time-step without issues. Have tried changing under-relaxation, AMG pressure cycle, time-step, pressure scheme, time discretisation scheme but nothing helps. The even stranger thing is that when I run it in Fluent 16 on another cluster, the solution just moves along nicely past the crash point.

Any suggestions/ ideas? Thanks in advance!