Abstract: In physical viscosity SPH method with low Reynolds number,density reinitialization is performed with reproducing kernel particle method(RKPM).It can avoid numerical dissipation resulting from artificial viscosity.Numerical stability of physical viscosity SPH method with low Reynolds number is improved.Taking dam-break problem for example,it is shown that the method can remove numerical instability efficiently.The method can be applied to problems with higher Reynolds numbers or viscous fluid.

Key words: smoothed particle hydrodynamics method, physical viscosity, artificial viscosity, reproducing kernel particle method, density reinitialization