TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES
Online ISSN : 2189-4205
Print ISSN : 0549-3811
ISSN-L : 0549-3811
Coupled Numerical Analysis of Three-Dimensional Unsteady Flow with Pitching Motion of Reentry Capsule—Investigation of the Third Harmonics of the Aerodynamic Force—
Yuki TAKEDAKazuyuki UENOShingo MATSUYAMAHideyuki TANNO
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JOURNALS OPEN ACCESS

2020 Volume 63 Issue 6 Pages 249-256

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Abstract

Computational fluid dynamics (CFD) analysis coupled with pitching motion of a reentry capsule is performed, and a model equation for the aerodynamic force coincident with the CFD result is proposed. The self-excitation of pitching oscillation and the subsequent limit-cycle oscillation are reproduced in a fine-grid CFD simulation. The axis of the vortex ring in the wake extracted by the phase average is displaced to the lower side of the capsule base when the pitch angle α = 0 and > 0. Such a displacement induced the dynamic component of pitching moment around α = 0. Subsequently, the pitching moment coefficient is decomposed into a Fourier series, where the amplitude of the third harmonics is larger than the dynamic component of the fundamental frequency. The proposed model equation for the pitching moment, which fully includes the third harmonics, reproduces the same amplitude and the same frequency of the CFD result in the case of limit-cycle oscillation. Compared to conventional models, the present model was found to give a better approximation of the dynamic component CMdy of the unsteady aerodynamic work per unit time.

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© 2020 The Japan Society for Aeronautical and Space Sciences
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