SPH (Smoothed Particle Hydrodynamics) algorithm based symmetric boundary treatment method

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...

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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 ...

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