水下弹体空化流动的数值模拟

采用均质流模型对水下弹体的空化流动进行了数值模拟,控制方程的求解采用有限体积法,对流项采用迎风通量差分格式,时间步的推进则采用了LU-SGS隐式方法.使用质量传输模型模拟汽-液之间的质量转换.为了更好的计算低速流动,在计算中对对流项进行了预处理,并对质量传输源项进行了点隐式处理.对绕圆柱钝头体空化流动进行了模拟,雷诺数Re＝136 000,计算得到了圆柱形钝头体在空化数σ＝0.1,0.2,0.3时的壁面压力系数,并与试验结果进行了对比,符合良好.在此基础上研究了弹体带尾迹的超空化现象,空化数σ＝0.2,0.1,0.06,在σ＝0.06下得到了水下弹体的超空化尾迹. 

Numerical simulation of cavitation flow field for under water projectile

A homo-equilibrium model was used to compute the hydrodynamic cavitation flow field over an axisymmetric projectile by solving the incompressible Navier-Stokes equations.The governing equations were resolved in a finite volume manner,the convective fluxes were treated by an upwind differencing scheme and the time was integrated using the LU-SGS approach.A mass transfer model introduced by Kunz was implemented in a viscous Navier-Stokes solver.A preconditioning method was used for the low-speed computations ...