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A method and system for realizing three-dimensional fluid-solid one-way coupling

A fluid-solid, one-way technology, applied in image data processing, animation production, instruments, etc., can solve the problems of fluid-solid two-way coupling calculation complexity and high, no penetration, etc.

Active Publication Date: 2017-08-29
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3) Becker et al. introduced direct force in 2009 to model the boundary force. This method uses the prediction correction mode to correct the position and velocity of the particles after colliding with the boundary, so as to achieve no penetration phenomenon and simulate a variety of boundaries. condition, this method is highly complex for the calculation of fluid-solid two-way coupling, and requires two queries of surrounding neighbor particles in each iteration

Method used

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  • A method and system for realizing three-dimensional fluid-solid one-way coupling
  • A method and system for realizing three-dimensional fluid-solid one-way coupling
  • A method and system for realizing three-dimensional fluid-solid one-way coupling

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Embodiment 1

[0078] figure 1 It is a flow chart of a method for implementing three-dimensional fluid-solid one-way coupling provided by Embodiment 1 of the present invention. like figure 1 As shown, the method mainly includes the following steps:

[0079] Step 11, discretize the triangular mesh of the solid boundary into particles, and perform uniform sampling of the boundary particles.

[0080] The specific implementation steps are as follows:

[0081] 1) Read the triangular mesh of the solid model (mainly read the irregular triangular boundary mesh of the solid model into the memory), and establish the surrounding symbolic distance field of the solid model, specifically: each triangular mesh in the solid model Create a bounding box, and divide the grid in a uniform way for each bounding box; calculate the signed distance from each grid point to the solid model, and the signed distance field is stored in a hash table to form a grid that exists around the solid model The narrow-bandwid...

Embodiment 2

[0154] Figure 4 It is a schematic diagram of a system for implementing three-dimensional fluid-solid one-way coupling provided by Embodiment 2 of the present invention. like Figure 4 As shown, the system mainly includes:

[0155] The solid boundary particle sampling module 41 is used to discretize the triangular mesh of the solid boundary into particles, and perform uniform sampling of the boundary particles;

[0156] The fluid particle state calculation module 42 is used to calculate the state of the fluid particle in the solid, including: the density of the fluid particle at the boundary between the fluid and the solid, the pressure and viscosity of the fluid particle, and the surface tension of the fluid particle;

[0157] The fluid particle information update module 43 is used to update the velocity and position information of the fluid particles using a numerical integration model;

[0158] The velocity and position correction module 44 of penetrating particles is us...

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Abstract

The invention discloses an implement method and an implement system for three-dimensional fluid-solid one-way coupling. The implement method includes: dispersing triangular meshes at the boundary of a solid into particles, and performing homogenized sampling on boundary particles; calculating state of fluid particles in the solid, wherein the state includes density of the fluid and the fluid particles at the boundary of the solid, pressure and viscous force of the fluid particles, and surface tension of the fluid particles; updating speed and position information of the fluid particles by a numerical integration mode; correcting the speed and the position of the fluid particles when the fluid particles penetrate through the boundary of the solid, and thereby achieving three-dimensional fluid-solid one-way coupling. According to the method and the system provided by the invention, stability during boundary treatment is increased, when pressure and viscous force is successfully simulated and penetrating effect is prevented, computation complexity is greatly reduced, and macroscopic effect of the surface tension is effectively simulated, furthermore, the mesh distorting phenomenon in the case of directly simulating aggregation force does not appear.

Description

technical field [0001] The invention relates to the field of physics-based computer real-time animation technology, in particular to a method and system for realizing three-dimensional fluid-solid one-way coupling. Background technique [0002] Lagrangian fluid simulation has always been a hot research topic in the field of computer animation, and its particle-based fluid representation naturally supports the simulation of some micro-scale fluid phenomena while unconditionally guaranteeing mass conservation. The smoothed particle dynamics SPH (Smoothed Particle Hydrodynamics) method is a typical Lagrangian method, which was proposed by Lucy, Monaghan&Gingold and others in 1977 to solve the problem of planetary motion in astrophysics, and was later introduced to the computational fluid field of mechanics. When simulating a fluid, it describes the continuous fluid with interacting particle groups, and each particle carries various physical quantities, including mass, velocity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T13/20
CPCG06T13/20
Inventor 董兰芳章恒
Owner UNIV OF SCI & TECH OF CHINA
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