1- The characteristic length of the cell at the tim of the impeller is about 2 mm and the velocity there is about 1.4 m/s so the transiet time should be 0.0014 s. (contour plot attached)
2- can you please also discuss about the other mesh too. what do you think about that ? is it a good mesh or not ? BTW the cfd-dem runs in that want and do not give the error in the volume mesh.
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