Numerical Simulation of Helicopter Ditching on Wavy Water

Lu, Yujin; Xiao, Tianhang; Chen, Jichang; Tong, Mingbo; Liu, Fan; Zhu, Zhenhao

doi:10.2514/6.2019-3653

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…The validation cases for the ditching problem have been achieved in our previous studies, including the high-speed flat plate ditching [28], wedge water-entry [40], aerospace capsule water-landing [41] and regional aircraft ditching [42]. The comparison between the numerical results and experimental data in these publications shows that the numerical framework employed in this study can provide results with satisfactory accuracy for the ditching problems.…”

Section: Mesh and Time Step Size Convergence Studiesmentioning

confidence: 85%

Numerical Study of Wave Effect on Aircraft Water-Landing Performance

et al. 2022

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Aircraft, such as amphibious planes, airliners, helicopters and re-entry capsules, are frequently subject to impacting loads from water-landing/ditching on various free surfaces, especially under wave conditions. Understanding and quantifying the water-landing/ditching performance on wave surfaces are of fundamental important for the design and certification of crashworthiness in the field of aerospace engineering. This study aims to numerically assess the effect of wave surface on water-landing process of an amphibious aircraft. The numerical implementation is realized in Reynolds-averaged Navier–Stokes (RANS) framework by combining finite volume method (FVM), volume of fluid (VOF) approach and velocity-inlet wavemaker. The temporal-spatial characteristic of numerical wave and the accuracy of presented model are, respectively, validated by analytical wave and convergence studies. The aircraft landing simulations with different free surface conditions, i.e., calm water, regular wave with different wave heights are then performed and quantitatively compared through several physical parameters, including acceleration, velocity, pressure, pitch angle and free surface deformation. It was found that the aircraft regular wave-landing process experiences several unique stages comparing with the calm-water-landing case. The results clearly confirm that wave surface can influence the aircraft landing performance to a great extent. The fundamental mechanism is found to be that the wave surface slope and wave particle velocity remarkably change the impacting position and effective impacting velocity of the aircraft.

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Section: Mesh and Time Step Size Convergence Studiesmentioning

confidence: 85%

Numerical Study of Wave Effect on Aircraft Water-Landing Performance

et al. 2022

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“…established the simulation model for an AW159 helicopter ditching based on SPH method, the cases of a vertical drop of the AW159 helicopter at sea-state zero and on the crew of a wave were simulated. Lu et al[252] investigated the dynamic behavior of a helicopter during ditching on wavy water by solving the unsteady Reynolds-Averaged Navier-Stokes equation. The air-water interface was obtained by the volume of the fluid model, and a global moving mesh model was used to record the relative motion between the helicopter structure and water.…”

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confidence: 99%