A distributed parallel sph simulation method

Abstract

The invention discloses a distributed parallel SPH simulation method. The method is characterized by comprising the following steps of creating a simulation model to be subjected to simulation analysis and initializing settings; computing a pressure value, stress tensor and an artificial viscosity value of each particle corresponding to the simulation model; carrying out search analysis on the simulation model in each set time step, wherein the search analysis includes the steps of respectively carrying out inner search on each determined parallel sub-region and carrying out region search on a boundary of each determined parallel sub-region after each parallel sub-region and the boundary of each parallel sub-region which are corresponding to the simulation model are determined; computing a state equation and a control equation which are corresponding to the simulation model; and outputting a corresponding simulation result based on a set end condition. According to the method, the storage space needed in the simulation process is saved and the communication traffic is greatly reduced, so that the computational efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of computer simulation, in particular to a distributed parallel SPH simulation method. 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 repeatability, low...

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Problems solved by technology

Therefore, it is necessary to find a new search method that has some of the advantages of tree search without facing the problem of stack overflow or too deep recursion.

[0010] 3. At the same time, in the existing SPH method, there is no method that can efficiently process the solid wall boundary, especially the symmetrical boundary.

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 calculation particles, and another search is required , resulting in unnecessary waste of resources

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