基于任意拉格朗日-欧拉流固耦合方法的标枪飞行仿真

ALE-based fluid-structure coupling method in javelin flight simulation

目的(1)确定使用任意拉格朗日-欧拉(ALE,Arbitrary Lagrangian-Eulerian)流固耦合方法进行标枪飞行仿真的可行性;(2)通过ALE方法,确定最佳投掷时的攻角值。方法使用Femb前处理软件建立了标枪和空气的有限元模型;同时设置了标枪和空气的材料属性和单元属性,施加载荷、初始和边界条件,在此基础上用LS-DYNA求解器对给定出手参数的标枪进行了计算机仿真。结果给出了速度为30m/s,倾角为39°,高度为2m时,不同攻角下枪尖的水平和竖直位移。结论通过仿真,不但证明了使用ALE流固耦合方法进行标枪飞行计算机仿真是可行性的,而且出手参数的调节也容易控制;通过仿真分析,确定了30m/s和39°出手时,获得最佳投掷距离的攻角值为-3°。

Objective （1） To determine the feasibility of using fluid-structure coupled ALE（Arbitrary Lagrangian- Euledan） method in javelin flight simulation; （2） To determine the attacking angle in the optimum thrust by ALE method. Methods A FEM model of both javelin and air was built by Femb pre-processing software; and materials and elements properties were set up. Based on the applied loads, initial and boundary conditions, the simulation was carried out for given release parameters using LS-DYNSA solver. Results The vertical and horizontal displacement of javelin tip were obtained at 30m/s release speed, 39 degree release angle and 2 meters＇ height. Conclusion It is feasible to simulate javelin flight using ALE method; and the adjustment of release parameters in simulation can be controlled easily. The attacking angle is -3°obtained for the optimum throwing distance at 30m/s and 39 degree.