多介质ALE方法流固耦合影响因素及参数分析  

Influence Factors and Parameters of Fluid-solid Coupling in Multi-medium ALE Method

作　　者：汪振 吴茂林[1] 孙玉松[1] WANG Zhen;WU Mao-lin;SUN Yu-song(College of Arms Engineering,Navy University of Engineering,Wuhan Hubei 430033,China)

机构地区：[1]海军工程大学兵器工程学院,湖北武汉430033

出　　处：《计算机仿真》2021年第2期18-23,共6页Computer Simulation

摘　　要：为了探究LS-DYNA程序流固耦合关键字PFAC参数大小以及网格大小对数值模拟结果的影响,同时得到适合大口径弹体入水数值模拟的参数,应用LS-DYNA程序ALE方法对大口径弹体以速度200m/s垂直入水进行数值模型。研究了网格密度以及控制流固耦合关键字中PFAC参数大小对结果的影响。从能量以及理论角度对结果进行了分析。对参数变化从理论及数值模拟结果的角度进行解释。得出了网格密度对此数值计算模型的影响,得到了合理的网格密度。对比了不同PFAC数值对平头和钝头弹体入水的影响。In order to explore the influence of the parameters of LS-DYNA program fluid-solid coupling keyword PFAC and the grid size on the numerical simulation results,the parameters suitable for the numerical simulation of large-caliber projectile body entering water were obtained in this paper.The ls-dyna program ALE method was applied to conduct a numerical model of a large-caliber projectile body entering water vertically at a speed of 200 m/s.The influence of grid density and the size of PFAC parameters on the results was studied.The results were analyzed in terms of energy and theory.The variation of parameters was explained theoretically and numerically.The influence of mesh density on the numerical model was obtained,and the reasonable mesh density was also obtained.The influences of different PFAC values on the water entry of flat and blunt projectiles were compared.

关 键 词：流固耦合 罚函数 网格密度 

分 类 号：TJ67[兵器科学与技术—武器系统与运用工程]