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A general post-processing method for meshless numerical results

A meshless, numerical technology, applied in the field of computational mechanics, can solve problems such as poor versatility, only zero-order precision, and low precision, and achieve the effect of improving visualization characteristics

Inactive Publication Date: 2017-03-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The versatility is poor, and the results need to be regularized in the actual use process;
[0005] (2) The accuracy of this method is low, only the zero-order accuracy

Method used

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  • A general post-processing method for meshless numerical results
  • A general post-processing method for meshless numerical results
  • A general post-processing method for meshless numerical results

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Embodiment 1

[0073] Embodiment 1 The following takes the shear flow in a two-dimensional cavity as an example to illustrate the process of the technical solution of the present invention, such as figure 1 Shown.

[0074] step 1

[0075] Taking the shear flow in a two-dimensional cavity as an example, the side length of the square cavity is L=0.001m, the particle spacing at the initial moment dx=dy=0.00025m, the smooth length h=λdx, where λ=1.3, and the particle density is the standard condition The density of air ρ p =1.27kg / m 3 , The mass of the particle m p =ρdxdy, the velocity u of the particles on the upper wall p = 0.001m / s remains unchanged, and the velocity of the left and right walls and the lower wall is zero. Use any mesh-free method (such as SPH, ISPH, FPM, FVPM) to numerically simulate the shear flow in the cavity. Here, the SPH method is used to obtain all the physical quantities of the particles in the cavity and on the boundary, including the density ρ p , Quality m p , X speed ...

Embodiment 2

[0091] Embodiment 2 The following uses natural convection as an example to illustrate the technical solution of the present invention.

[0092] step 1

[0093] Taking natural convection as an example, the side length of the square cavity is L = 0.1m, the particle spacing at the initial moment dx = dy = 0.002m, the smooth length h = λdx, where λ = 1.3, the particle density is the air density ρ under standard conditions p =1.27kg / m 3 , The mass of the particle m p =ρdxdy, the velocity of all wall particles is 0, the upper and lower walls adopt adiabatic boundary conditions, the temperature of the left and right walls is constant, the left wall is the high temperature wall, the right wall is the low temperature wall, and the left and right wall temperature difference ΔT = 10k. Use any mesh-free method (such as SPH, ISPH, FPM, FVPM) to numerically simulate natural convection. Here, the SPH method is used to obtain all physical quantities of the particles in the cavity and on the boundar...

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Abstract

The invention relates to a universal gridless numerical result post-processing method, and belongs to the technical field of computational mechanics. The method includes the following steps that particle physical information obtained in a gridless method is stored; a computing domain of a researched problem is divided into grids, and grid joint information is stored; by means of a particle searching method, gridless particles in an influence domain of each grid node are determined; kernel functions and derivatives in the influence domains of the grid nodes are calculated; an inverse matrix of a coefficient matrix is calculated; the physical quantity on the grid nodes is calculated; the physical quantity on the grid nodes is led into drawing software, and a result is displayed. According to the method, the physical information obtained through numerical simulation is added to the new grid nodes in a differential mode, and visuality of calculation results of the gridless method is improved.

Description

Technical field [0001] The invention relates to a general post-processing method for grid-free numerical results, belonging to the technical field of computational mechanics. Background technique [0002] Fluid mechanics is a very important subject in the field of aerospace. Nowadays, fluids are no longer limited to static problems, but are more concerned with dynamic problems. The traditional CFD method is a grid method, these methods are usually based on moving grid technology or nested grid technology to solve the grid deformation problem, but when the boundary deformation of the research problem is too large, these two methods may produce grid distortion At this time, grid reconstruction is usually used to eliminate the distorted grid, but the grid reconstruction will inevitably reduce the accuracy and increase the amount of calculation. For this reason, a mesh-free method has been proposed. The mesh-free method does not require a mesh and therefore will not encounter the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 雷娟棉黄灿王锁柱彭雪莹吴小胜
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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