A sph-based simulation method for viscous incompressible fluids

Abstract

The invention relates to an SPH-based viscous incompressible fluid simulation method, which is a high-precision, high-robust SPH-based viscous incompressible fluid simulation method, and avoids the occurrence of problems in the solution process through the unified solution scheme of incompressible constraints and viscous constraints Non-physical conflicts and drift errors can quickly and efficiently solve the problem of missing surface particles without deploying Ghost particles. The invention can stably simulate Newtonian fluids with different viscosity coefficients and non-Newtonian fluids with variable viscosity coefficients, can maintain the surface shape of viscous fluids for a long time, and can control the stretching and thinning process of viscous fluids, the rope effect, and the shape of films and many other fine motion processes are accurately simulated.

Description

technical field [0001] The invention belongs to the field of computer graphics, in particular to a viscous incompressible fluid simulation method based on SPH. Background technique [0002] In people's production and life, viscous fluid can be seen everywhere, such as oil, asphalt, honey, ketchup, etc. Therefore, viscous fluid is an important simulation object in the field of graphics. Although the meshless particle method / smooth particle hydrodynamics (SPH) method is a relatively mature and widely used fluid simulation method, it is still difficult to achieve stable, fast and accurate simulation of viscous fluids by this system method. Especially when simulating the characteristics of viscous fluid stretching and thinning, simulating viscous fluids with thin film morphology, maintaining the surface morphology details of highly viscous fluids, and simulating non-Newtonian fluid materials with a wide range of viscosity coefficients, the traditional meshless particle method / ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the traditional gridless particle method is difficult to accurately and stably simulate the motion of viscous fluid, the present invention provides a fast simulation method for viscous fluid with high precision and high robustness

The invention avoids non-physical conflicts and drift errors in the solution process through a unified solution scheme of incompressible constraints and viscous constraints, and quickly and efficiently solves the problem of missing particles on the surface without laying Ghost particles, and at the same time considers the fluid in the stretching process The influence of negative pressure in the middle part finally realizes stable, accurate and fast simulation of Newtonian fluid and non-Newtonian fluid with different viscosity values

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