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Improved three-dimensional two-material Euler interface processing algorithm

A kind of interface processing and material technology, applied in the direction of electrical digital data processing, special data processing application, calculation, etc., can solve the problems that it is difficult to accurately describe the material interface, and the transport sequence of two materials is not determined.

Inactive Publication Date: 2013-01-09
吴吉林
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AI Technical Summary

Problems solved by technology

For large deformation problems, Euler's method has great advantages, but it is difficult to accurately describe the interface between substances, so the accuracy of interface processing has always been the key content of Euler's method
The Youngs interface method does not determine the transport order of the two substances, which is the key problem of the Euler-type calculation method

Method used

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  • Improved three-dimensional two-material Euler interface processing algorithm
  • Improved three-dimensional two-material Euler interface processing algorithm
  • Improved three-dimensional two-material Euler interface processing algorithm

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Embodiment Construction

[0004] Euler coordinates are selected, and the cuboid computational domain is divided into cuboid sub-regions by three sets of planes whose intervals are the grid lengths in the x, y and z directions, and each cuboid sub-region is a grid. Grids are numbered with (i, j, k), which means the i-th column from left to right, the j-th column from front to back, and the k-th layer grid from bottom to top, and its center is located at (x l ,y j ,z k ), the lengths of each grid in the x, y and z directions are Δx i , Δy j and Δz k .

[0005] In order to deal with the boundary around the computational domain and maintain the unity of the program code, a row of virtual grids is added on top, bottom, left, right, front and back of it. The continuous boundary condition is used to simulate the infinite boundary, so that the material transport can be realized between the virtual grid and the boundary grid around the calculation domain, and the mechanical variable value of the virtual gr...

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Abstract

The invention discloses an improved three-dimensional two-material Euler interface processing algorithm. The transportation sequence of two materials is not determined by the conventional method, and is a key problem of an Euler computation method. The transportation sequence of the two materials in a hybrid grid is related to the material content of the grid and grids around the grid, and if the transportation sequence of the two materials is not taken into account, transportation errors caused by a wrong material transportation sequence can be continuously accumulated after a plurality of transportation steps to cause reduction in the processing accuracy of a material interface. For the problem, the algorithm comprises the following steps of: discretizing a computational domain, processing a boundary condition, and adding computed contents for the transportation sequence of the materials. The material interface determined by the improved interface processing algorithm is in line with objective reality, and the processing accuracy of the material interface is also improved; and by the method, a material transportation problem can be well solved.

Description

1 technical field [0001] The invention relates to an improved three-dimensional two-material Euler interface processing algorithm. 2 background technology [0002] Multi-substance fluid dynamics problems widely exist in many fields of military industry and national economy, and can be studied by numerical simulation. For large deformation problems, Euler's method has great advantages, but it is difficult to accurately describe the interface between substances, so the accuracy of interface processing has always been the key content of Euler's method. The Youngs interface method does not determine the transport order of the two substances, which is the key problem of the Eulerian calculation method. 3 Contents of the invention [0003] The transport order of two substances in a mixed grid is related to the content of the substances in the grid and its surrounding grids, and this transport order exists objectively. If the transport sequence of the two substances is not cons...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 吴吉林
Owner 吴吉林
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