A feature-based method for capturing discontinuity in flow field

A flow field and space technology, applied in the numerical field of computational fluid dynamics, can solve problems such as order reduction and inefficient numerical format, and achieve the effect of improving computational efficiency

Active Publication Date: 2021-10-26
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned discontinuous capture techniques are relatively robust, but in some cases, some units with good properties will be captured additionally, resulting in inefficient or degraded numerical formats

Method used

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  • A feature-based method for capturing discontinuity in flow field
  • A feature-based method for capturing discontinuity in flow field
  • A feature-based method for capturing discontinuity in flow field

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings and examples. It should be understood that the following examples are intended to facilitate the understanding of the present invention, and have no limiting effect on it.

[0060] figure 1 Shows the process flow chart of the feature-based discontinuous capture method of the present invention, including the following steps: meshing the calculation area of ​​the problem to be solved to generate a structured grid or an unstructured grid; combining with high-order numerical format calculation The unit average value of the numerical solution of the problem to be solved in the space unit; use the unit mean value of the space unit to calculate the characteristic mean value of the hyperbolic (vector) conservation law equation of the space unit; use the geometric topological relationship of the grid to construct Cell-left-weighted and cell-right-weighted averages, and / or cell-bot...

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Abstract

The invention discloses a feature-based discontinuous capture method, which includes: meshing the calculation area of ​​the problem to be solved; calculating the unit average value of the numerical solution of the problem to be solved in the space unit; calculating the hyperbolic value of the space unit (Vector) The characteristic average value of the conservation law equation; construct the weighted average value on the left side of the unit and the weighted average value on the right side of the unit about its characteristic average value of the spatial unit; calculate the output value of the indicator of the spatial unit, and then judge whether the spatial unit is Belongs to the discontinuous unit. The present invention utilizes the computer technology of artificial neural network, combines the characteristic property of hyperbolic conservation law equation, constructs the artificial neural network (ANN) discontinuity (shock wave) indicator of a single hidden layer, can be applied to the shock wave of numerical simulation fluid Problem and capture of discontinuity (shock) location.

Description

technical field [0001] The invention belongs to the field of computational fluid dynamics numerical methods, in particular to a discontinuous (shock wave) capture method based on the characteristic properties of the hyperbolic conservation law equation, which can be applied to numerical simulation of fluid shock wave problems and discontinuous (shock wave) position capture . Background technique [0002] With the development of computer technology, high-precision numerical format has attracted more and more attention in the numerical simulation of complex flow of aircraft. However, high-precision numerical schemes (including finite difference, finite volume, and finite element methods) may produce non-physical oscillations when dealing with discontinuous (shock wave) problems, which may cause high-order numerical schemes to collapse. Therefore, one of the key technologies of an efficient and stable high-precision numerical format is its discontinuity (shock wave) capture te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/27G06N3/04G06N3/08G06F111/10
CPCG06N3/08G06N3/048G06N3/045
Inventor 刘铁钢冯亦葳
Owner BEIHANG UNIV
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