I know that the artificial viscosity can be tuned by some amount, and the "recomended value" is 0.01, which I tried to stick with. In the case moving square the art. viscosity value is set to 0.00001 in combination with the shifting alg.
I did some settling / drop tests with floating particles and I get better values using art. visco = 0.00001 then art visco 0.01 in combination with the shifting.
So is it possible that the shifting "slows down" the falling ability of a floating object, and it is better to use 0.00001 instead of 0.01, when one uses shifting ?????
Thank you so much for any help !!!