Abstract
A real-time SPH fluid simulator is useful for constructing a virtual environment containing fluid with a free surface. In order to develop a more efficient simulator, it is better to control the mass of each particles, in which particles near the surface has light weight and make high density; and particles near the bottom is heavy and low density. In this research, we study the stability of such simulations including particles with different mass and the characteristics of a feedback gain. Then, we propose a more stable feedback method considering mass change rate. Finally, we perform a simulation to show the effect of the proposed method.
