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Method and system for setting characteristic nonreflecting boundary condition of coupling edge processing

A characteristic non-reflection, boundary condition technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as large errors, achieve stable setting process, and ensure characteristic non-reflection boundary conditions for coupled edge processing Set the effect of the result

Inactive Publication Date: 2014-01-15
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] Based on this, it is necessary to provide an accurate method and system for setting characteristic non-reflective boundary conditions of coupled edge processing in view of the problem that there are relatively large errors in the setting method of characteristic non-reflective boundary conditions for general coupling edge processing.

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  • Method and system for setting characteristic nonreflecting boundary condition of coupling edge processing
  • Method and system for setting characteristic nonreflecting boundary condition of coupling edge processing
  • Method and system for setting characteristic nonreflecting boundary condition of coupling edge processing

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[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below according to the drawings and embodiments. It should be understood that the specific implementations described here are only used to explain the present invention, not to limit the present invention.

[0027] The characteristic non-reflection boundary condition setting method and system of the coupling edge processing of the present invention adopts the fully compressible Navier-Stokes equation, and does not use other methods such as low Ma number approximation and acoustic suppression, which is completely compressible in the true sense. Direct numerical simulation of compressive flows. The characteristic non-reflection boundary condition setting method and the compressible control equation adopted by the system of the coupling edge processing of the present invention are as follows:

[0028] Continuity equatio...

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Abstract

The invention provides a method and system for setting a characteristic nonreflecting boundary condition of coupling edge processing. Defined in a grid node domain of a computational domain, a governing equation of characteristic wave forms of coupling edges of the grid node domain is generated, a pressure and speed time derivative equation of compressible fluid on the coupling edges is generated, density of the compressible fluid and characteristic wave parameters of the coupling edges are substituted to the equation, a coupling edge solving variable time advance equation is generated, and according to the coupling edge solving variable time advance equation, the boundary condition of the coupling edges in the compressible fluid is determined. According to the method, through strict mathematical logic computation, an Euler equation boundary condition preset method is prevented from being directly applied to a Navier-Stokes equation, the whole setting process is stable and accurate, the sound wave reflection problem of the compressible fluid can be well solved, and accuracy of a characteristic nonreflecting boundary condition setting result of the coupling edge processing is guaranteed.

Description

technical field [0001] The invention relates to the technical field of setting boundary conditions of compressible fluids, in particular to a method and system for setting characteristic non-reflection boundary conditions for coupled edge processing. Background technique [0002] Correctly dealing with the boundary conditions of compressible flow is a very critical step in obtaining numerical simulation results. Because in direct numerical simulation, it is impossible to simulate an infinite calculation area, due to the limitation of computing resources, the calculation area of ​​direct numerical simulation will be artificially limited to a very limited area, so it must be in the limited calculation area given certain boundary conditions. [0003] The key reason for the difficulty in dealing with the boundary conditions of the three-dimensional compressible Navier-Stokes equation is the lack of a complete mathematical theory of characteristic non-reflecting boundary conditi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 李德波
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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