Physically based fluid animation is an advanced research hotspot in the computer graphics area. However

the realistic and real-time simulation of large-scale fluid simulation is still difficult to handle using current methods. To solve these problems

this study proposes a novel physically based method based on shallow water equation. First

to deal with the instability problems of numerical solution

such as blur and water spot artificial effects

our method proposes to solve shallow water equation using a stable Euler numerical method. Second

we propose a stable model of coupling fluid height field with rigid body and particle system; thus

a two-way fluid-solid coupling and small-scale features can be realistically simulated. Third

to achieve real-time simulation

we design a multiresolution grid algorithm and an interval particle sampling algorithm to accelerate the entire simulation process. Experimental results demonstrate that the proposed method can solve the instability and calculation complex problems and achieve 20 fps in the configuration of 300×300 grid resolution and 22K fluid particles. The proposed method is stable and efficient and suits the realistic simulation of large-scale fluid for real-time applications

such as computer games and 3D vision simulation.