Error: Internal error at line 1549 in file '..\..\src\rp_mstage.c'.
 

Hello,

I am using density based solver, for transient real gas flow. I patched initial filling pressure in compression tank with nozzle to 7bar. I have compression due to the wall movement and the case includes mesh interfaces for sliding mesh.

In the firts itteration the follwoing message occurs:

# Divergence detected in AMG solver: Coupled --> Decreasing coarsening group size!
# Divergence detected in AMG solver: Coupled --> Increasing relaxation sweeps!

Divergence detected - temporarily reducing Courant number to 0.5
and trying again...

Divergence detected - temporarily reducing Courant number to 0.05
and trying again...

Divergence detected - temporarily reducing Courant number to 0.005
and trying again...

Divergence detected - temporarily reducing Courant number to 0.0005
and trying again...

Divergence detected - temporarily reducing Courant number to 5e-05
and trying again...

Error: Internal error at line 1549 in file '..\..\src\rp_mstage.c'.
Divergence detected in AMG solver
Error Object: #f


Any kind of help would be useful. Thank you in advance.