convergence criterium for unsteady 3D VOF
Hello,
My objective is to calculate the drag coefficient on a freesurface ship. I would like to do this on three grids (coarse, medium, fine) and make a Richardson Extrapolation. So now I get a timehistory of the cd for each grid. I am wondering what would be the best convergence criterium? How do I proceed to find an appropiate and comparable cd for each grid? Where could I find information on this subject? Thank you very much! 
Hi,
I'm doing the same research as you. I have to calculate the lift and drag on a speedboat using VOF. I have some results but i'm not sure if they are 100% correct. If you want i can send you how i did the calculations. Maybe we can compare them to see if it's correct. Vincent 
Great, I've sent you an email.

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