An implementation method for improving the simulation efficiency of an incompressible water body based on IISPH

Abstract

The invention relates to an implementation method for improving the simulation efficiency of an incompressible water body based on IISPH (International Mobile Platform Hierarchical Hierarchy). The method comprises the following steps: firstly, a speed non-divergence model is introduced into an IISPH, and a divergence error of a speed field in each time step length of the IISPH method is corrected;Secondly, through the improved density constant model, the density constant model and the speed divergence-free model share calculation factors, and efficient simulation of the incompressible water body is achieved. By introducing a divergence-free speed model, divergence error correction is realized, and the problem that the density error is continuously increased along with time is solved; By improving the density constant model, the calculation factor sharing of the speed divergence-free model and the density constant model is realized, and the problem of redundant calculation is solved. According to the method, the real-time simulation speed of 30.10 frame/second under the 17k particle scale can be achieved, and Compared with the PCISPH (Predictive- Corrective Incompressible SPH) method, the simulation efficiency is improved by 24.17%; compared with the IISPH method, the simulation efficiency is improved by 16.21%.

Description

technical field [0001] The present invention relates to the field of computer graphics, in particular to a realization method for improving the simulation efficiency of incompressible water body based on IISPH (Implicit Incompressibility Smooth particle hydrodynamics, implicit incompressibility smooth particle hydrodynamics). Background technique [0002] Limited by the computing performance and efficiency of computers, water body simulation technology has been in the theoretical research stage for a long time. In recent years, with the improvement of computer hardware performance and computing efficiency, water body simulation has been realized. At the same time, the development of computer graphics has further promoted the development of physics-based water body simulation technology, making it gradually become one of the research directions that has attracted much attention. Smooth particle hydrodynamics (SPH) method is a mesh-free method to calculate the overall motion s...

AI Technical Summary

Problems solved by technology

However, during the simulation process of this method, the particle density at the free surface of the water body is prone to be underestimated, resulting in particle aggregation and other phenomena.

[0010] 2. Implicit incompressible methods

[0016] The explicit incompressible water body simulation method directly solves the liquid state equation or the pressure Poisson equation, and the calculation complexity is high; the implicit incompressible water body simulation method, such as PCISPH, IISPH, etc., uses the method of prediction and correction, but the number of iterations in the solution process is too high. There are many, and each iteration needs to perform a time-consuming and huge neighbor particle search step, resulting in a sharp increase in the amount of calculation as the number of particles increases

In summary, although the existing incompressible water body simulation methods realize the incompressibility of water bodies, the cost of imposing incompressibility is too high, which reduces the simulation efficiency

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