RBF data transfer based on physical gradient modification

LIU Zhikan; LIU Shenshen; LIU Xiao; ZENG Lei; DAI Guangyue

doi:10.7527/S1000-6893.2020.24506

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2021 , Vol. 42 >Issue 7: 124506 - 124506

DOI: https://doi.org/10.7527/S1000-6893.2020.24506

Fluid Mechanics and Flight Mechanics

RBF data transfer based on physical gradient modification

LIU Zhikan ,
LIU Shenshen ,
LIU Xiao ,
ZENG Lei ,
DAI Guangyue

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1. Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China

Received date: 2020-07-09

Revised date: 2020-08-18

Online published: 2020-09-14

Supported by

National Natural Science Foundation of China (11702315); National Numerical Wind Tunnel Project

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Abstract

The radial basis function is an important data transfer method in the multi-physical field coupling calculation of complex shaped aircraft. The distribution of physical quantities of complex aircraft, usually closely related to local flow characteristics, changes drastically in different regions. How to consider the influence of the anisotropic distribution of actual physical quantities in the radial basis function with isotropic characteristics has become the key to improving its accuracy. Aiming at the problem of the radial basis function, this paper proposes a new method for data transfer based on the local physical gradient to adaptively modify the radial basis weight in three directions. Using the hypersonic control surface and wing body combination to verify the feasibility and effect of this method in a single data transfer, we carry out aerodynamic/thermal/structural multi-physical field coupling for the compression corner shape, and compare it with the wind tunnel test results to verify the applicability and reliability of the method in the long-term high-frequency data transmission of the actual coupling problem. The results show that this method can improve the single interpolation effect of Thin Plate Spline(TPS), Multiquadric (MQ) and other global basis functions, and effectively improve the robustness of the MQ method for morphological parameters. The improvement of the compact support basis function after gradient modification has accomplished the effect of the global basis function, such as TPS and MQ, with fewer selected points and achieved better efficiency and accuracy of data transfer. The coupling calculation results obtained by this method are consistent with the experimental data, indicating the availability of this method and the good engineering application prospects in the complex shaped multi-physical field coupling problem.

Key words： multi-physical field coupling; data transfer; radial basis function; modification of physical gradient; hypersonic aircraft; wind tunnel test

Cite this article

LIU Zhikan , LIU Shenshen , LIU Xiao , ZENG Lei , DAI Guangyue . RBF data transfer based on physical gradient modification[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021 , 42(7) : 124506 -124506 . DOI: 10.7527/S1000-6893.2020.24506

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