Multi-ball particle two-layer grid search contact detection method in discrete element simulation

A technology of multi-spherical particles and grid search, which is applied to the details, instruments, and calculations of 3D image data, and can solve problems such as few multi-spherical particles

Active Publication Date: 2016-07-20
WUHAN UNIV
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Problems solved by technology

However, methods for improving the contact detection efficiency of multi-spheri

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  • Multi-ball particle two-layer grid search contact detection method in discrete element simulation
  • Multi-ball particle two-layer grid search contact detection method in discrete element simulation
  • Multi-ball particle two-layer grid search contact detection method in discrete element simulation

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[0082] The technical solution of the present invention will be further specifically described below through the embodiments in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention. For clarity of expression, the drawings are shown in two-dimensional form, and the equations are expressed in three-dimensional form.

[0083] A two-layer grid search contact detection method for multi-spherical particles in discrete element simulation, the implementation process of the scheme is as follows figure 1 Shown, specific embodiment is:

[0084] Step 1: First configure a corresponding envelope sphere for each multi-sphere particle, such as figure 2 As shown, the geometric center P of the enveloping sphere of the multi-spherical particle i i the global coordinates of and Calculated using the following formula:

[0085] q i ...

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Abstract

The present invention relates to a multi-ball particle two-layer grid search contact detection method in discrete element simulation. The method comprises the following steps: a global space is divided into square or cube girds with the size of D; performing a first layer grid search, if the enveloping ball of a target particle is intersected with the enveloping ball of a certain candidate particle, the first layer grid search is completed, or else, the intersection detection between the enveloping ball of the target particle and the enveloping balls of other candidate particles is performed; and when the enveloping ball of the target particle and the enveloping balls of other candidate particles are intersected, a square or cube local space with the size of D+d is divided into square or cube grids with the size of d for the usage of a second layer grid search, and the contact between the cell ball of the target particle and the cell balls of the candidate particles is detected. The multi-ball particle two-layer grid search contact detection method in discrete element simulation keeps the time consuming of the contact detection without increasing while significantly decreasing memory consumption of the contact detection and provides an effective technological means for the large-scale application of the multi-ball particle discrete element simulation in the industrial field.

Description

technical field [0001] The invention relates to the field of non-spherical particle medium dynamics simulation based on discrete element method, in particular to a two-layer grid search contact detection method for multi-spherical particles in discrete element simulation. Background technique [0002] Spherical particles are widely used in 3D DEM simulations due to their simple geometry. However, real particle shapes are difficult to be efficiently represented by simple spheres. Therefore, the shape representation of non-spherical particles has been extensively discussed in related patents and literature. The shape expression methods of non-spherical particles can basically be divided into two categories: single-particle methods and multi-spherical particle methods. [0003] In the single-particle method, a non-spherical particle is approximated by a single particle with a complex geometry such as an ellipse, ellipsoid, or superquadric surface. The geometry of two-dimensi...

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Application Information

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IPC IPC(8): G06T17/10
CPCG06T17/10G06T2200/04G06T2200/16
Inventor 胡国明方自强李婉婉桂文杰刘勇
Owner WUHAN UNIV
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