shehab Gamrah
Thanks, I have reported the drag force and calculating the cd by using the velocity of the inner sphere from the function. However, I keep getting unreasonable values of drag force and coefficient. For instance at time 0.001 (1st time step) I had a drag force of 7164 N, which means the cd is 519, however this is an unreasonable cd value for a half sphere. The properties of the fluid are density 1000.567 and viscosity 0.0009. Is there a reason for these drastically high valuesn