A new judging method of free water surface of MPS is being proposed in this study. This method decreases the generation of the surface particle inside the fluid and improves the pressure distribution. The authors investigate a relation between the number of free surface particle and the hydrostatic pressure in the calculation of static water. The stable pressure is obtained in this new method compared to the original method. In the new method, high accuracy and computational stability are also obtained when applied to the calculation of the collapse of a water column. The study suggests that the new method is useful as the judging method of free water surface.

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