Title: Reduced frequency effect on longitudinal stability derivatives prediction of a rectangular wing by using high fidelity computational method

Authors: Novita Atmasari; Mochammad Agoes Moelyadi

Addresses: Research Centre of Aeronautics Technology, National Research and Innovation Agency, Indonesia ' Aerospace Engineering, Bandung Institute of Technology, Indonesia

Abstract: This research utilises high-fidelity computational methods to analyse the reduced frequency effect in predicting the dynamic stability derivatives, revealing critical insights into aerodynamic performance. The rectangular wing is analysed through the simulation of three oscillatory motion relative to the freestream, specifically plunging, pitching, and flapping. This study applies a CFD-based transient simulation method that is capable of simulating unsteady flow around complex geometries, which acts as a bridge between the shortcomings of analytical methods with low accuracy and experimental methods with high costs. Unsteady flow simulation is solved by the time-dependent RANS and SST governing equations. Aerodynamic force and moment resulting from the simulations are then processed and analysed using Fourier series approach to obtain the stability derivatives. For comparison, simulations were carried out using other methods, Datcom and XFLR5. The stability derivatives with low reduced frequency are show good agreement to Datcom and XFLR5 compared to high reduced frequency.

Keywords: stability derivatives; unsteady simulation; reduced frequency; CFD; sinusoidal motion; Fourier.

DOI: 10.1504/PCFD.2025.148785

Progress in Computational Fluid Dynamics, An International Journal, 2025 Vol.25 No.5, pp.271 - 288

Received: 28 May 2024
Accepted: 20 Dec 2024
Published online: 24 Sep 2025 *

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