Subjects: Mechanics >> Basic Mechanics submitted time 2022-12-21 Cooperative journals: 《应用力学学报》
Abstract：
In order to study the high-speed water entry of tandem revolved bodies,a three-dimensional numerical simulation model of high-speed water entry of tandem revolved bodies is established based on solving Reynolds time averaged Navier Stokes equation,using VOF multiphase flow model and 6 degrees of freedom(6DOF)rigid body motion model,Schnerr-Sauer cavitation model and overlapping grid technology.Some new phenomena in the cavities evolution of tandem revolved bodies were found,and the evolution law of cavities under different water entering time sequences were obtained.Combined with the evolution law of cavities,the influence mechanism of the evolution process of cavities on the motion of tandem revolved bodies was analyzed,and the motion mode of tandem revolved bodies entering water at high speed was given.The results show that the water entry process of the secondary revolved body is affected by the cavitation flow field of the first revolved body.In the water entry impact stage,the impact force of the secondary revolved body is less than that of the first revolved body.Moreover,the velocity attenuation of the secondary revolved body is less than that of the first revolved body.With the increase of water entering time sequence,the water entry motion mode of tandem revolved bodies appears rear-end collision mode and weak disturbance mode in turn.In the rear-end collision mode,the secondary revolved body can enter the water entry cavity formed by the first revolved body and finally catch up with the first revolved body.In the weak disturbance model,the cavities evolution process of the first revolved body is not affected by the water entry of the second revolved body,while the cavities evolution and motion of the second revolved body are disturbed by the cavitation wake of the first revolved body.
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