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DSMC calculation result noise reduction processing method based on radial basis function

A technology for noise reduction processing and calculation results, which is applied in the field of noise reduction processing of DSMC calculation results based on radial basis functions, which can solve the problem of low DSMC collision calculation accuracy and achieve the effects of small workload, strong independence and simple calculation.

Active Publication Date: 2021-03-26
CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a DSMC calculation result noise reduction processing method based on radial basis function to solve the problem of low precision of DSMC collision calculation

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  • DSMC calculation result noise reduction processing method based on radial basis function
  • DSMC calculation result noise reduction processing method based on radial basis function
  • DSMC calculation result noise reduction processing method based on radial basis function

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Embodiment Construction

[0043] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0044] In DSMC calculation, the statistical value of wall surface sampling often has large statistical errors. In order to ensure the calculation accuracy, the collision grid must adopt a relatively small scale, and the grid used for sampling should be larger than the collision grid, so as to effectively reduce the statistical noise.

[0045] The present invention aims at the problem that the DSMC method sampling data on th...

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Abstract

The invention discloses a DSMC calculation result noise reduction processing method based on a radial basis function. According to the method, the idea that the collision grids and the sampling gridsare separated is used for reference, two sets of grids with different thicknesses are adopted, and statistical noise is reduced by increasing the number of statistical samples. A radial basis functiontool is used for completing data interpolation from physical data on an original collision grid node to a sampling grid node, the number of simulation molecules in a unit does not need to be increased or the sampling step number does not need to be increased, and the method has the advantages that a main calculation program is not affected, calculation is simple, the workload is small, and the calculation precision is high.

Description

technical field [0001] The invention relates to the field of numerical simulation of rarefied gas dynamics, in particular to a noise reduction processing method for DSMC calculation results based on radial basis functions. Background technique [0002] As the main tool in the field of numerical calculation of rarefied flow, DSMC method is established on the basis of probability and statistics. This method replaces real gas molecules with a large number of simulated molecules, and realizes the simulation of physical flow by simulating the movement and collision of molecules. Macroscopic physical information needs to be obtained through sampling and statistics of microscopic simulated molecular information. Therefore, there are certain statistical errors in the calculation results, or called statistical "noise", which will disturb the flow structure and affect the reading and analysis of the calculation results. Moreover, in the DSMC / NS hybrid algorithm, the existence of sta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F17/16G06F111/10G06F113/08G06F119/14
CPCG06F30/28G06F17/16G06F2111/10G06F2113/08G06F2119/14
Inventor 李锦耿湘人江定武陈坚强
Owner CALCULATION AERODYNAMICS INST CHINA AERODYNAMICS RES & DEV CENT
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