Convergence using multigrid solving
 

Hy eveybody,

I'm student at the University in Munich(Germany). I'm trying to use Numeca Fine solver and his multigrid calculation. The problem is that my grid is generated with the newest Igg/Autogrid version and saved as Fine 6. The solver, witch is a older version (6.3.2), can read this data file. The problem is that my grid is everywhere multiple of 16 so I can solve the airflow on 3 grids, from the coarse to the finest. there is no problem with 2 first grids, but as the computer changes on the last and finest grid an error occures. I've seen that the residuals increase suddently at every grid change, maybe that is the problem. I would like to know if someother people have this problem, if someone has solved it maybe with some expert parameters, or to reduce the increase between the grids... Thx for the answers bye