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A realistic turbulence simulation method based on sph

A simulation method and realistic technology, applied in the field of realistic turbulence simulation based on SPH

Active Publication Date: 2021-09-21
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the vortex produced by this type of method cannot exist independently of the solid

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  • A realistic turbulence simulation method based on sph
  • A realistic turbulence simulation method based on sph
  • A realistic turbulence simulation method based on sph

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Experimental program
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Embodiment Construction

[0114] The technical solutions and results of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0115] The present invention proposes a realistic turbulence simulation method based on SPH, which includes two specific steps, that is, calculating the velocity field and angular velocity field based on the improved SPH turbulence model and simulating vortex details based on surface vortex constraints, finally obtaining more stable and real turbulence . Such as Figure 7 As shown, the implementation steps are specifically described below.

[0116] Step 1: Initialize the particle state, calculate the smooth kernel function, and determine the nearest neighbor particle of the current particle.

[0117] Step 2: Solve the stress state of the current particle and predict the position of the current particle at the next moment.

[0118] Step 3: traverse adjacent particles, perform collision detection, and it...

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Abstract

The present invention is a realistic turbulence simulation method based on SPH. Aiming at the problem of vortex instability caused by severe disturbance in the traditional SPH method when simulating turbulence, a specific improvement method is proposed, so as to obtain a more stable and lasting vortex. First, the SPH turbulence model is established based on the Navier-Stokes equation, and the PBF theoretical method is introduced to accelerate the problem of excessive calculation cost of collision detection, and the cost of calculating the collision force in the traditional method is reduced by directly correcting the particle position , but this method will introduce additional damping, causing the vortex to dissipate easily; secondly, for the problem of vortex dissipation, an additional vortex constraint is introduced, and the surface dispersion is used to guide the position of the turbulent surface vortex generation, and the motion of the particles is corrected by the turbulent force direction. The experimental results show that the application of this method to simulate turbulence can ensure better stability and realism, the average frame rate can reach a real-time simulation speed of 30.10fps, and the vortex phenomenon is more complete than the traditional model.

Description

technical field [0001] The present invention relates to the field of computer graphics, in particular to a realistic turbulence simulation method based on SPH (Smoothed Particle Hydrodynamics, smooth particle hydrodynamics), which includes two specific steps, namely vorticity generation based on surface dispersion, vorticity generation based on vorticity Turbulent force generation, resulting in a more stable and realistic turbulent flow. Background technique [0002] The research objective of the present invention is to study the simulation of realistic turbulent flow based on the SPH construction framework, use the position-based fluid (Position Based Fluids, PBF) method to accelerate the turbulence simulation, and use the vortex detail simulation based on the surface vortex constraint to increase and Enhance eddy details and enable multi-scene turbulence simulation. [0003] The SPH method is a meshless method for solving the dynamic equations of continuum. It solves the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/25G06F119/14
Inventor 艾明晶郑爱玉
Owner BEIHANG UNIV