一种适用于颗粒非规则分布的阻止SPH数值断裂的方法

 〖HT5”H〗摘〓要〖HTSS〗: 光滑粒子流体动力学(SPH)方法已广泛应用于航空航天领域中大变形的碰撞计算。数值断裂是SPH计算中一种常见问题，可严重影响计算结果。把适用于颗粒规则分布的阻止SPH数值断裂的方法推广到颗粒非规则分布的情形，得到了一种适用于颗粒非规则分布的阻止数值断裂的加颗粒方法。然后将该方法应用于存在数值断裂的悬臂梁弯曲仿真计算，验证了其有效性。最后把该方法应用于弹丸撞击飞机蒙皮的非规则颗粒模型计算，并和规则颗粒模型得到的结果及试验结果进行比较。对比结果表明：对于非规则分布的颗粒模型，该加颗粒方法可有效地阻止数值断裂,提高计算精度，并可较为普遍使用。

A Method of Preventing SPH Numerical Fracture for Irregular Particle Models

Smoothed particle hydrodynamics (SPH) method has been applied widely to the calculation of im-pacts with large deformations in the fields of aeronautics and astronautics. Numerical fractures are often en-countered in SPH computations which can seriously reduce the computational accuracy. First, by extending the method of preventing numerical fractures for regular-distributi0n particle models to irregular-distribution parti-cle models in SPH, an inserting particle method of preventing numerical fracture is obtained for irregular-dis-tribution model. Second, the method is validated by the bending of a 3D cantilever beam with numerical frac-tures. Finally, the method of preventing numerical fractures for irregular particle models is applied to the cal-culation of impacts of the projectile on the aircraft skin, and the results obtained from regular particle models, irregular particle models and the experiment are compared and analyzed. The results show that numerical frac-tures can be effectively prevented for irregular particle models, the computational accuracy can be improved, and the method can be applied widely.