Under the elicitation of Professor Denton's effective research of turbomachinery CFD (Cambridge University of the United Kingdom)

a new multiple grid scheme is put forward in combination with explicit time marching method

finite volume difference code and distributed body force (by Professor Denton) to calculate the internal flow field of H.Krain centrifugal impeller.The results show that the multi grid scheme greatly improves the converging speed and that the calculation results are consistent with the measurements