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High-precision flow field solving method for triangulated grid with large length-width ratio

A technology of triangulation and aspect ratio, applied in design optimization/simulation, constraint-based CAD, instruments, etc., can solve problems such as low precision, reduce calculation errors, improve numerical performance, and improve solution accuracy.

Pending Publication Date: 2021-02-26
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a high-precision flow field solution for triangulated grids with large aspect ratios in order to solve the problem of low precision in the flow field solution method for triangulated grids with large aspect ratios in the prior art method

Method used

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  • High-precision flow field solving method for triangulated grid with large length-width ratio
  • High-precision flow field solving method for triangulated grid with large length-width ratio
  • High-precision flow field solving method for triangulated grid with large length-width ratio

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Embodiment Construction

[0036] Such as figure 1 As shown, the present invention is oriented to the high-precision flow field solution method of large aspect ratio triangulated grids, including the following steps:

[0037] Step A, generating an unstructured network, the grid units in the unstructured network are triangular grids;

[0038] Step B, initializing the unstructured network, and reading parameters of the unstructured network;

[0039] Step C, calculating the area weighted center of each grid unit in the unstructured network;

[0040] It is characterized in that it also includes the following steps:

[0041] Step D, after replacing the geometric center of each grid unit with the corresponding area weighted center, reconstructing each grid unit;

[0042] Step E, constructing a spatial term based on the unit variable and its derivative information obtained through reconstruction;

[0043] Step F, based on the spatial item constructed in step E, the flow field is calculated using an integra...

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Abstract

The invention discloses a high-precision flow field solving method for triangularized grids with a large length-width ratio, and the method comprises the steps: A, generating an unstructured network,and enabling grid units in the unstructured network to be triangular grids; B, initializing an unstructured network, and reading parameters of the unstructured network; C, calculating an area weighting center of each grid unit in the unstructured network; D, replacing the geometric center of each grid unit with a corresponding area weighting center, and reconstructing each grid unit; step E, constructing a space term based on the reconstructed unit variable and derivative information thereof; and step F, calculating a flow field by using an integral solver based on the space item constructed in the step E. According to the method, high-order precision of flow field solving can be guaranteed, calculation errors are reduced, the solving accuracy of the flow field is effectively improved, unification of grid generation automation and numerical simulation precision on the triangularized grid with the large length-width ratio is preliminarily achieved, and numerical expression of a solver is improved.

Description

technical field [0001] The invention belongs to the field of fluid dynamics calculation, in particular to a high-precision flow field solution method for triangulated grids with large aspect ratios. Background technique [0002] When numerically simulating the flow field, it is first necessary to discretize the computational domain by means of grid division. Currently commonly used discrete grid division methods mainly include Cartesian grid, structured grid and unstructured grid. Among them, the Cartesian grid was first applied in the field of computational fluid dynamics, and it is relatively easy to generate. The grid unit is a standard rectangle or cuboid, and the sides or faces of the unit are parallel to the Cartesian coordinate system, so there is no need to worry about the grid quality, and it is very easy Easy to do locally adaptive encryption or sparse. However, the Cartesian grid cannot be completely body-fitting, and it is difficult to accurately describe the b...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F111/04G06F111/10G06F113/08
CPCG06F30/28G06F2111/04G06F2111/10G06F2113/08
Inventor 董义道孔令发刘伟杨小亮
Owner NAT UNIV OF DEFENSE TECH
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