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Unstructured grid direction template selection method and flow field solving method

An unstructured grid and template technology, applied in CAD numerical modeling, special data processing applications, instruments, etc., can solve problems such as poor numerical performance and complicated direction template selection process, to achieve accurate capture, reduce the number of template units, Overcome the effect of mesh skew

Pending Publication Date: 2020-10-16
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0022] The purpose of the present invention is to provide a simple and effective unstructured grid direction template selection method and flow field solution method in view of the complex direction template selection process and poor numerical performance in the prior art

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  • Unstructured grid direction template selection method and flow field solving method
  • Unstructured grid direction template selection method and flow field solving method
  • Unstructured grid direction template selection method and flow field solving method

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Embodiment Construction

[0060] Compared with the prior art, the present invention proposes a simpler way to find direction templates. This method of directional template search is also to expand the template unit along two directions, but at this time, it no longer depends on the independent local direction of each template unit, but the global direction of the solution domain. The so-called global direction is actually the wall normal and flow direction with obvious flow anisotropy.

[0061] To put it simply, when looking for a direction template, firstly a set is given for a specific central unit, and this set is composed of grid units with the same vertices as the central unit, and then through the geometric center of the central unit, along the normal direction of the wall and Flow direction finds grid cells that intersect a given set. We name this template unit selection as the global orientation template. Compared with the local direction template, the global direction template of the present...

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Abstract

The invention discloses an unstructured grid direction template selection method and a flow field solving method, and the corresponding direction template selection method for any grid unit j in an unstructured grid comprises the steps: A1, taking the grid unit j as a central unit, and taking the grid unit, sharing the vertex with the central unit, in the unstructured grid as a template unit; A2,making two straight lines passing through the geometric center of the central unit, wherein one straight line is parallel to the normal direction of the wall surface, and the other straight line is parallel to the flow direction; and A3, taking the template unit, intersected with one of the two straight lines in the step A2, in the template units obtained in the step A1 as a direction template corresponding to the grid unit j. The method is simple and effective, the geometric center of the grid unit is corrected through an area weighting method, and the problem of grid deflection on the triangular grid unit with the large compression ratio is effectively solved; the method is high in calculation precision, can effectively reduce the number of template units, is controllable in number of template units, is short in calculation time, is high in convergence efficiency, and can accurately capture the flow field features and flow anisotropy.

Description

technical field [0001] The invention belongs to the field of fluid mechanics calculation, and in particular relates to a method for selecting an unstructured grid direction template and a method for solving a flow field. Background technique [0002] The differential finite volume method means that the control equation is in the differential form, and the advantage of this method is that for the variables to be obtained and the source items, the concept is no longer the average value, but the point value. Therefore, the complex process of source term integration is avoided, and the steps of discretization of the control equation are effectively simplified. [0003] The form of the differential governing equation is as follows, [0004] [0005] where u j is the variable to be solved for the jth grid cell, f n is the convective flux at the element surface along the normal vector outside the element surface, V j and represent the integral domain and the boundary of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/23G06F30/28G06F2111/10G06F2113/08G06F2119/14
Inventor 董义道孔令发刘伟杨小亮郑天韵
Owner NAT UNIV OF DEFENSE TECH
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