Right-angle grid self-adaptive modeling method suitable for grid Boltzmann method

A right-angle grid and self-adaptive technology, applied in the field of computational fluid dynamics, can solve the problems of loss of locality in calculation and increase the complexity of lattice Boltzmann method, etc., and achieve the effect of clear flow field details, reduced quantity, and guaranteed accuracy

Active Publication Date: 2020-08-04
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

However, most of these methods require second-order interpolation or special treatment of sparse grid interfaces, which increases the complexity of the lattice Boltzmann method, and may cause the calculation to lose locality, or introduce additional errors

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  • Right-angle grid self-adaptive modeling method suitable for grid Boltzmann method
  • Right-angle grid self-adaptive modeling method suitable for grid Boltzmann method
  • Right-angle grid self-adaptive modeling method suitable for grid Boltzmann method

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] see figure 1 , which shows a rectangular grid adaptive modeling method suitable for the lattice Boltzmann method provided by the embodiment of the present invention, the method includes:

[0031] S101: Divide a root grid unit covering the entire flow field area of ​​an object of a specific shape into a plurality of rectangular sub-grid units of a given size to obtain an initial grid, the initial grid includes the object and The initial object plane grid that intersects with the object plane of the object and the initial flow field grid that does not intersect with the object plane of the object and is outside the object, wherein the object of the specific shape can be, for example, an airplane wing;

[0032] S102: Carry out rectangular grid adaptive proc...

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Abstract

The embodiment of the invention discloses a right-angle grid self-adaptive modeling method suitable for a grid Boltzmann method. The modeling method comprises the following steps: S101, dividing a root grid unit into right-angle sub-grid units to obtain an initial grid comprising an initial object plane grid and an initial flow field grid; S102, performing right-angle grid self-adaptive processingon the initial object plane grid to obtain a final self-adaptive object plane grid, and taking the final self-adaptive object plane grid and the initial flow field grid as an initial calculation grid; S103, solving the flow field by adopting a lattice Boltzmann method based on the current calculation grid to obtain a current flow field calculation result, and obtaining a flow field calculation adaptive parameter based on the current flow field calculation result; S104, judging whether all flow field calculation self-adaptive parameters are smaller than a first set threshold value or not; S105, if so, taking the current flow field calculation result as a final flow field calculation result, and if not, carrying out right-angle grid adaptive processing on the current flow field grid, takingthe current flow field grid and the final adaptive object plane grid as a new calculation grid, and returning to the step S103.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a rectangular grid adaptive modeling method suitable for the lattice Boltzmann method. Background technique [0002] With the continuous development of the Lattice Boltzmann Method (Lattice Boltzmann Method, referred to as the LBM method), its application is becoming more and more extensive. However, this method needs to use a set of Cartesian grid calculations. At present, there is no mature Cartesian grid generation software suitable for the LBM method, and it has only appeared in the large-scale commercial software Powerflow. [0003] While the Lattice Boltzmann method brings various advantages, it also brings some inherent disadvantages, such as: large amount of calculation, symmetrical and uniform grid division (regular hexagon, square), non-adjustable calculation accuracy, etc., so that the Lattice Boltzmann The application of the method is limited in many ways....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06F30/28G06F30/23
CPCG06T17/205G06F30/28G06F30/23G06T2210/24G06F2113/08
Inventor 桑为民顾洪宇牛俊杰谢睿轩邱奥祥庞润
Owner NORTHWESTERN POLYTECHNICAL UNIV
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