Abstract
In digital production environments, high-quality visual effects play a key role in our mobile device such as game and film. The simulation of fluid animation with free surface is an important area in computer graphic. However, the tracking of fluid surface is a challenging problem because of its instability. In this paper, a coupled grid-particle method for fluid animation surface tracking and detail preserving is proposed. Firstly, based on the nonequilibrium extrapolation method, we design a novel method for reconstructing distribution functions (DFs) of interface grids of lattice Boltzmann method (LBM) and couple the reconstruction method with LBM and volume of fluid (VOF) to track the free surface, which can obtain the accurate surface. Secondly, in order to avoid the loss of details caused by weaknesses in the traditional LBM-VOF method, we design a coupled grid-particle method that not only makes full use of the advantages of the coupled grid-particle method but also realizes the two-way coupling between grid method and particle method. Furthermore, for achieving the real-time requirements of fluid animation, we use GPU parallel computing to accelerate the simulation and use an improved screen space fluid (SSF) rendering method for realistic rendering. The various experiments show that this work can track the fluid surface with high precision and preserve the details of the fluid surface, and it also achieves good real-time performance in large-scale fluid simulation.
Highlights
Small-scale features, such as fluid drop, splash, and ripple, show interesting details in realistic physical simulation based on fluid animation
Based on the lattice Boltzmann method (LBM)-volume of fluid (VOF) method [6], this paper proposes a coupled grid-particle method which can solve the problem of low accuracy of reconstructing distribution functions (DFs) of interface grids and abnormal interface grid in the LBM-VOF method
The contributions of this article are as follows: (1) This paper proposes a new method for reconstructing DFs of interface grids and couple the reconstruction method with LBM-VOF
Summary
Small-scale features, such as fluid drop, splash, and ripple, show interesting details in realistic physical simulation based on fluid animation. (1) This paper proposes a new method for reconstructing DFs of interface grids and couple the reconstruction method with LBM-VOF This method enhances the accuracy of the reconstruction, to achieve the purpose of preserving the fluid surface detail (2) Aiming at the problem of anomalous interface grids, this paper proposes a coupled grid-particle method. This method replaces abnormal interface grids with particles and uses the advantage of the particle method to express details to enhance the details of fluid surface.
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