基于径向基函数的网格变形及非线性气动弹性时域仿真研究

doi:10.7527/S1000-6893.2013.0122

Abstract

Abstract:

To carry out research of nonlinear aeroelasticity, this paper presents a nonlinear time-domain aeroelastic simulation program which adopts computational fluid dynamics/computational structural dynamics (CFD/CSD) couple method. The program couples the nonlinear structural finite element software NASTRAN with a multi-block structured grid-based CFD solver developed by myself. Radial basis function (RBF) is used to transfer information between the two solvers and deform grid. To improve the efficiency of the RBF method, a space point reduction algorithm based on multi-level interpolation is constructed. For the purpose of reducing the number of space points, the interpolation object of each interpolation step is the error of previous step, and interpolation region is limited simultaneously. Results of some mesh deformation examples show that this way can support the movement of large deformation with high computational efficiency. With the use of this program, flutter computation of AGARD 445.6 wing is completed, static aeroelastic computation of a wing with a large aspect ratio is performed and a dynamic aeroelastic simulation of limit-cycle-oscillation (LCO) of a cropped delta wing is carried out. Results demonstrate that structural nonlinearity has strong influences on aeroelastic phenomenas when the aspect ratio of the wing is large or the amplitude of response is great.

Key words: radial basis function, grid deformation, interpolation, nonlinearity, aeroelasticity, large aspect ratio, delta wing, limit-cycle-oscillation

CLC Number:

V215.3

XIE Liang, XU Min, AN Xiaomin, CAI Tianxing, CHEN Weixian. Research of Mesh Deforming Method Based on Radial Basis Functions and Nonlinear Aeroelastic Simulation[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013, 34(7): 1501-1511.

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Research of Mesh Deforming Method Based on Radial Basis Functions and Nonlinear Aeroelastic Simulation

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