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Numerical research on slamming characteristics of aircraft landing on water

Journal of Hydrodynamics 2023年第1期35卷 171-184页

作者： Dao-sheng Ning Ya-jun Shi Gui-yong Zhang Heng Wang Huan Hu Zhi-fan Zhang State Key Laboratory of Structural Analysis for Industrial Equipment School of Naval Architecture EngineeringDalian University of TechnologyDalian116024China China Ship Scientific Research Center Wuxi200136China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai200240China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

In order to investigate the impact characteristic of an aircraft landing on water,a computational fluid dynamics(CFD)simulation is conducted to explore the slamming characteristics of the NACA TN 2929 A *** flow around the model is solved by using Reynolds-averaged Navier-Stokes equations with the shear stress transport(SST)k—ωturbulence model,based on finite volume method(FVM).The free surface is captured by using the volume of fluid(VOF)method,and the aircraft impact process is realized with help of overset mesh ***,the effects of horizontal and vertical velocities and initial pitch angle on the slamming load,attitude change,impact pressure and flow field evolution are *** results reveal that the horizontal velocity has a considerable influence on whether the aircraft’s horizontal tail hits the water,and further affects the maximum vertical load as well as the maximum pitch angle throughout the impact *** vertical velocity determines the slamming load before the horizontal tail strikes the water,while the horizontal velocity has a significant effect on the load after the horizontal tail hits the water.A smaller initial pitch angle results in not only a heavier slamming load but also a more dramatic change of the posture after the aircraft impacts the *** impact pressure of the aircraft is maximized at the junction of the approaching surface of the fuselage and the free *** some cases,the pressure is also concentrated on the undersurface of the horizontal tail.

关键词： Computational fluid dynamics(CFD) aircraft landing water entry slamming load motion attitude change

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Hydroelastic Analysis of a Rectangular Plate Subjected to slamming loads

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Journal of Marine Science and Application 2017年第4期16卷 405-416页

作者： Shan Wang C.Guedes Soares Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TécnicoUniversidade de LisboaLisboa 1049-001Portugal

A hydroelastic analysis of a rectangular plate subjected to slamming loads is presented. An analytical model based on Wagner theory is used for calculations of transient slamming load on the ship plate. A thin isotropic plate theory is considered for determining the vibration of a rectangular plate excited by an external slamming force. The forced vibration of the plate is calculated by the modal expansion method. Analytical results of the transient response of a rectangular plate induced by slamming loads are compared with numerical calculations from finite element method. The theoretical slamming pressure based on Wagner model is applied on the finite element model of a plate. Good agreement is obtained between the analytical and numerical results for the structural deflection of a rectangular plate due to slamming pressure. The effects of plate dimension and wave profile on the structural vibration are discussed as well. The results show that a low impact velocity and a small wetted radial length of wave yield negligible effects of hydroelasticity.

关键词： slamming load hydroelastic analysis vibration of plates modal expansion method finite element method

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A comparison between Smoothed-Particle Hydrodynamics and RANS Volume of Fluid method in modelling slamming

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Journal of Ocean Engineering and Science 2016年第2期1卷 119-128页

作者： Marcus Sasson Shuhong Chai Genevieve Beck Yuting Jin Jalal Rafieshahraki National Centre for Maritime Engineering and Hydrodynamics Australian Maritime CollegeUniversity of TasmaniaLauncestonTasmaniaAustralia

The oil and gas industry requires complex subsea infrastructure in order to develop offshore oil and gas *** installation,these components may encounter high slamming loads,stemming from impact with the water *** paper utilises two different numerical methods,the mesh-free Smoothed Particle Hydrodynamics(SPH)approach and Reynolds Averaged Navier-Stokes(RANS)Volume of Fluid(VOF)method to quantify these loads on a free-falling *** investigation is also interested in conducting a parameter study and determining the effect of varying simulation parameters on the prediction of slamming event kinematics and *** surface impact of a freefalling wedge was introduced as a case study and has been simulated using SPH and RANS,with the results being compared to an experimental *** was found from the SPH simulations that particle resolution and the size of the SPH particle kernel are very important,whilst the diffusion term does not play an important *** latter is due to the very transient nature of slamming events,which do not allow sufficient time for diffusion in the fluid *** the RANS simulations,motion of the wedge was achieved using the overset grid technique,whereby varying the discretising time step was found to have a pronounced impact on the accuracy of the captured slamming *** analysing the numerical data,one can observe that the RANS results correlate slightly better with the experimental data as opposed to that obtained from the SPH ***,considering the robustness and quick set up of the SPH simulations,both of these two numerical approaches are considered to be promising tools for modelling more complicated slamming problems,including those potentially involving more intricate structures.

关键词： Smoothed Particle Hydrodynamics Reynolds Averaged Navier-Stokes slamming load Wedge

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