[Gary Burns]

Hi.

Im busy doing a CFD problem for my university degree.

The problem Ive modeled is a simple box which is half full water. It has a inlet at the bottom and a outlet at the top. The inlet pumps water in at a velocity of 0.9m/s.

When solving I had the following problem.

During the iterations it was saying
"reversed flow in 367 faces on pressure-outlet 25" The numebr is different each time and ranges from 1 to 1900.
however this didnt cause a error.

I did get an error as the Global Courant number was greater than 250 therfore I decreased the timestep size as recommended.

However after a few more iterations I got the following error:

# Divergence detected in AMG solver: pressure correction -> Turning off correction scaling!
# Divergence detected in AMG solver: pressure correction -> Increasing relaxation sweeps!

Error: Divergence detected in AMG solver: pressure correction


Does anyone konow what this means????

Many Thanks
Gary