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A Symmetric Boundary Handling Method for SPH Algorithm

A boundary processing and symmetric technology, applied in the field of computer simulation, can solve problems such as extra generation, resource waste, and many disadvantages, and achieve the effect of removing time consumption

Active Publication Date: 2019-08-13
INTESIM DALIAN
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are two main ways to deal with the boundary of the solid wall. The first is to pre-arrange a layer of particles on the boundary. All particles have a reaction force with this layer. When the particles are close to this layer of particles, they will receive the opposite direction The effect is to organize particle penetration. When the particles are far away, they will be stretched to prevent separation. However, this method has too many disadvantages and is not very practical, so there is a second method-mirror particle method, mirror particle method. It is to arrange particles that are mirror-symmetrical to this side on the other side of the symmetrical boundary, because if the model is symmetrical, then the calculation result of the complete model is also like this, so as long as each step is mirrored, it is equivalent to calculating only half of the particles The state of all particles can be obtained. The advantage of this method is that it is very accurate, the same as the complete calculation, but the disadvantage is that additional mirror particles need to be generated, and the number of mirror particles is the same as the number of actual particles, and another search is required. Unnecessary waste of resources

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  • A Symmetric Boundary Handling Method for SPH Algorithm
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Embodiment Construction

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the implementation of the present invention. example, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] Such as Figure 1-Figure 2 As shown, a kind of symmetric boundary processing method for SPH algorithm described in the present invention is characterized in that, comprises the following steps:

[0036] (1) Create a simulation model to be simulated and analyze and initialize the created simulation model; since the preprocessing of the SPH simulation calc...

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Abstract

The invention discloses an SPH (Smoothed Particle Hydrodynamics) algorithm based symmetric boundary treatment method. The method is characterized by comprising the following steps: creating a simulation model to be subjected to simulation analyzing, and initializing; calculating the pressure value, stress tensor and artificial viscosity value of each particle corresponding to the simulation model; performing search analysis on the simulation model within each set time step; calculating a state equation and control equation corresponding to the simulation model; if a symmetric boundary is in the simulation model, performing acting pair information supplementation on the simulation model; and outputting a corresponding simulation result based on the set end condition. According to the method, the existing action pair information is screened and supplemented, so that the additional time of generating mirror particles and researching can be saved while the operation of additionally generating the mirror particles and dividing background grids for the mirror particles to research is avoided, and thus the symmetric boundary treatment and the common researching calculation are unified to treat.

Description

technical field [0001] The invention relates to the technical field of computer simulation, in particular to a symmetric boundary processing method for SPH algorithm. Background technique [0002] Usually, the laws of motion and deformation of the objects we care about can be described by differential equations, which are called physical control equations. In fact, most moving objects are complex in shape, and the physical control equations must be numerically determined with the help of a computer. Calculation, also called numerical simulation or numerical simulation, means to use numerical calculation methods to simulate the movement and deformation of objects under certain conditions according to objective laws. able to come very close. Therefore, numerical simulation calculation has become the third research method next to experimental means and theoretical means in scientific research and engineering applications. It has the advantages of intuitive results, high repeat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 张群
Owner INTESIM DALIAN
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