Gust response of an elasto-flexible morphing wing using fluid–structure interaction simulations

PFLÜGER, Jonathan; BREITSAMTER, Christian

doi:10.1016/j.cja.2023.12.017

Chinese Journal of Aeronautics

2024

DOI: 10.1016/j.cja.2023.12.017

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Gust response of an elasto-flexible morphing wing using fluid–structure interaction simulations

Jonathan PFLÜGER,

Christian BREITSAMTER

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2024

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Cited by 3 publications

References 32 publications

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Wake interference effects on flow-induced vibration of flexible membrane wings

Li,

Jaiman,

Lei

et al. 2024

Physics of Fluids

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This work investigates the effect of wake interference on the nonlinear coupled dynamics and aerodynamic performance of flexible membrane wings at a moderate Reynolds number. A high-fidelity computational aeroelastic framework is employed to simulate the flow-induced vibration of flexible membrane wings in response to unsteady vortex wake flows produced by an upstream stationary circular cylinder. The coupled dynamics of the downstream membrane are investigated at different gap ratios, aeroelastic numbers, and offset distances. The variations in flow features, membrane responses, and frequency characteristics are analyzed to understand the wake interference effect on membrane aeroelasticity. The results indicate that the aerodynamic performance and flight stability of the downstream membrane are degraded under the wake interference effect. Four distinct flow regimes are classified for the cylinder–membrane configuration, namely (i) single body flow, (ii) co-shedding I, (iii) co-shedding II, and (iv) detached vortex-dominated vibration, respectively. The mode transition is found to build new frequency synchronization between the flexible membrane and its own surrounding flows, or the wake flows of the cylinder, to adjust the aerodynamic performance and membrane vibration. This study sheds new light on membrane aeroelasticity in response to wake flows and enhances understanding of the fluid–membrane coupling mechanism. These findings can facilitate the development of next-generation bio-inspired drones that have high flight efficiency and robust flight stability in gusty flows.

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Wake interference effects on flow-induced vibration of flexible membrane wings

Li,

Jaiman,

Lei

et al. 2024

Physics of Fluids

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A Time-Domain Calculation Method for Gust Aerodynamics in Flight Simulation

Yang,

Wen

et al. 2024

Aerospace

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Gusts have a significant impact on aircraft and need to be analyzed through flight simulations. The solution for time-domain gust aerodynamic forces stands as a pivotal stage in this process. With the increasing demand for flight simulations within gusty environments, traditional methods related to gust aerodynamics cannot fail to balance computational accuracy and efficiency. A method that can be used to quickly and accurately calculate the time-domain gust aerodynamic force is needed. This study proposes the fitting strip method, a gust aerodynamic force solution method that is suitable for real-time flight simulations. It only requires the current and previous gust information to calculate the aerodynamic force and is suitable for different configurations of aircraft and different kinds of gusts. Firstly, the fitting strip method requires the division of fitting strips and the calculation of the aerodynamic force under calibration conditions. In this study, the double-lattice method and computational fluid dynamics are used to calculate the aerodynamic force of the strips. Then, the amplitude coefficients and time-delay coefficients are obtained through a fitting calculation. Finally, the coefficients and gust information are put into the formula to calculate the gust aerodynamic force. An example of a swept wing is used for validation, demonstrating congruence between the computational results and experimental data across subsonic and transonic speeds, which proves the accuracy of the fitting strip method in both discrete gusts and continuous gusts. Compared with other methods, the fitting strip method uses the shortest time. Furthermore, the results of a calculation for normal-layout aircraft show that this method avoids the shortcomings of the rational function approximation method and is more accurate than the gust grouping method. Concurrently, gust aerodynamic force calculations were performed on aircraft with large aspect ratios and used in a real-time flight simulation.

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Special Issue “Gust Influences on Aerospace”

Wu,

Hölling

2024

Aerospace

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Gust response of an elasto-flexible morphing wing using fluid–structure interaction simulations

Cited by 3 publications

References 32 publications

Wake interference effects on flow-induced vibration of flexible membrane wings

Wake interference effects on flow-induced vibration of flexible membrane wings

A Time-Domain Calculation Method for Gust Aerodynamics in Flight Simulation

Special Issue “Gust Influences on Aerospace”

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