SPH方法对金属表面微射流的数值模拟

 光滑粒子流体动力学（Smoothed Particle Hydrodynamics）方法是一种无网格的拉氏计算方法，具有计算格式简单、易于计算大变形问题等优势。用二维SPH程序模拟了冲击加载下金属铝表面的沟槽状缺陷产生微射流的过程，得到了喷射物的总质量、最大速度和质量-速度曲线。还计算了相同深度、不同夹角的沟槽微射流，并与实验结果进行了比较。结果表明：计算得到的喷射物总质量和最大速度与实验结果符合较好，SPH方法对于估算金属表面的微射流提供了一种有效的数值模拟手段。

Simulated Microjet from Free Surface of Aluminum Using Smoothed Particle Hydrodynamics

Smoothed Particle Hydrodynamics (SPH) is a meshless Lagrangian hydrodynamic computational technique,and the form of SPH equations is simple.An obvious advantage of SPH is that it is meshless,thus large deformation calculations can be easily done with no connectivity complications.In this paper,the dynamic process of microjet from shocked aluminum with grooved surface is simulated with two-dimension SPH code.Jet mass,tip velocity and jet mass mass-velocity were obtained.Numerical results of microjet from grooves with the same depth and different angle are also presented,and compared with experimental ones.It is shown that SPH technique is an effective means for simulating microjet from metal free surface under shock loading.