弹丸高速侵彻水介质的理论分析与数值仿真

Theoretical Analysis and Numerical Simulation for Projectile Penetrating into Water at High Speed

弹丸在水中高速运动时涉及到复杂的流固耦合及多相流流体动力学问题,对于弹丸高速侵彻水介质的研究一直以来没有获得较大的突破。通过理论分析,给出了弹丸高速侵彻水介质的理论分析模型。并应用ANSYS/LS-DYNA软件,采用ALE算法对高速弹丸侵彻水介质过程进行了流固耦合的数值仿真计算。结果表明:该仿真模型有效解决了弹丸高速侵彻水介质时,由于流固耦合计算中流体形变引起的数值计算困难;弹丸初速越高,速度衰减越快,且变形越严重;衰减系数和阻力系数都随着弹丸初速的增大而增大。为弹丸高速侵彻水介质的理论分析和数值仿真研究提供有价值的参考。

The movement of high speed projectile in the water involves complex fluid-structure interaction（FSI） and fluid dynamics of multiphase flow problems. An important breakthrough is made in the study for high speed projectile penetrating into water. Through theoretical analysis, its theoretical analysis model of high speed projectile penetration into water is given out. The software ANSYS/ LS-DYNA and mulfi-matedal Arbifrary Lagrange Euler（ALE） are used to simulate the process of its penetration at high speed. The results show that the model can be used to solve the difficulty in numerical calculation of fluid- structure interaction （FSI） caused by fluid deformation when it penetrates into water. The higher its impact velocity is, the faster the velocity reduces under the water, and the more its deformation is. The attenuation coefficient and drag coefficient increases with the increase of impact velocity. It can be provides the valuable reference for theoretical analysis and numerical simulation studies of its penetration into water.