Hi

I am trying to run a pipe flow case with finer grid,after few iterations, it gives divergence in AMG solver.In residual plot, I see that the continuity curve is diverging. The same case is running fine with coarse mesh size.

your help in this regard is appreciated.

Thanks Sri.

Hi i think u have a non -positive mesh volum,any where u have aproblem about your nesh. Best

Please also check the grid size ratio... Try to avoid long cells (the best possible are square like cells)