Research on High-speed Water Entry of Vehicle Based on Two-way Fluid-Structure Coupling
Based on the elastomer hypothesis,a high-precision bidirectional fluid-structure coupling numerical model is established for a vehicle with a diameter of 0.533 m and entering water at a speed of 100 m/s,and the validity of the numerical model is verified by experiments.The evolution law of the cavitation and load is obtained through water entry simulation at different entering angles.The main conclusions are as follows.With the decrease of the water entry angle,the closing time of the splash curtain is delayed,and the asymmetry of cavitation is intensified.When the elastomer enters the water,the peak value of the impact load is smaller than that of the rigid body,and the trend of oscillation attenuation is shown.The peak stress of the vessel is distributed in a circular pattern,and the stress oscillates and attenuates at the initial stage of water entry,which concentrates at the tail.The stress distribution and the longitudinal deformation of the head are asymmetrical during oblique water entry.With the increase of the water entry angle,the peak value of stress and strain increases,and the propagation time of the stress wave becomes shorter.
high-speed water entryfluid-structure couplingcavityimpact load
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