Convergence in multiphase flow !! HELP !!!
Hi, i'm making gasliquid flow simulations. I began with time step equal to 1e06 s, otherwise convergence is impossible. it began then to converge, and i can fix time =1e04s, but after a few time step, convergence is more and more difficult to reach and I have to lower the time step size. Can somebody explain me why ?????
Thanx 
Re: Convergence in multiphase flow !! HELP !!!
Try increasing the time step by smaller increments!

Re: Convergence in multiphase flow !! HELP !!!
yes I did that, but when I get from 1e06 to 1e05, it takes 10 to 5 iteration per time step to converge. So I get to 1e04, then it convergences. And after a few time steps, convergence stops. And time step size wants to be lowered. Thanx though !!!

Re: Convergence in multiphase flow !! HELP !!!
try smaller underrelaxation parameters.
newbie 
Re: Convergence in multiphase flow !! HELP !!!
Hi you can use adaptive time stepping method in place of fixed.

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