Open Access

ARTICLE

Geometrically Nonlinear Flutter Analysis Based on CFD/CSD Methods and Wind Tunnel Experimental Verification

by Changrong Zhang, Hongtao Guo, Li Yu, Binbin Lv, Hongya Xia^*

Institute of High Speed Aerodynamics, China Aerodynamics Research and Development Center, Mianyang, 621000, China

* Corresponding Author: Hongya Xia. Email:

(This article belongs to the Special Issue: Vibration Control and Utilization)

Computer Modeling in Engineering & Sciences 2023, 136(2), 1743-1758. https://doi.org/10.32604/cmes.2023.025528

Received 18 July 2022; Accepted 09 October 2022; Issue published 06 February 2023

Abstract

This study presents a high-speed geometrically nonlinear flutter analysis calculation method based on the high-precision computational fluid dynamics/computational structural dynamics methods. In the proposed method, the aerodynamic simulation was conducted based on computational fluid dynamics, and the structural model was established using the nonlinear finite element model and tangential stiffness matrix. First, the equilibrium position was obtained using the nonlinear static aeroelastic iteration. Second, the structural modal under a steady aerodynamic load was extracted. Finally, the generalized displacement time curve was obtained by coupling the unsteady aerodynamics and linearized structure motion equations. Moreover, if the flutter is not at a critical state, the incoming flow dynamic pressure needs to be changed, and the above steps must be repeated until the vibration amplitude are equal. Furthermore, the high-speed geometrically nonlinear flutter of the wing-body assembly model with a high-aspect ratio was investigated, and the correctness of the method was verified using high-speed wind tunnel experiments. The results showed that the geometric nonlinearity of the large deformation of the wing caused in-plane bending to become a key factor in flutter characteristics and significantly decreased the dynamic pressure and frequency of the nonlinear flutter compared to those of the linear flutter.

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