基于ALE,CEL和SPH方法的球形破片高速冲击充液结构对比研究

为研究ALE,CEL和SPH方法在高速冲击流固耦合动力学数值分析中的差异性,开展球形破片高速冲击充液结构数值模拟研究。建立经文献资料验证的ALE,CEL和SPH三种动力学模型,研究了流体压力变化、形成的空腔尺寸、破片速度衰减变化和充液结构变形等模拟精度,并分析相应的计算成本。结果表明,ALE,CEL和SPH三种方法均能有效模拟破片高速冲击充液结构的流固耦合动力学过程;ALE方法预测的空腔尺寸精度较高;CEL方法预测的流体压力、破片速度衰减和充液结构变形精度较高;SPH方法预测的空腔尺寸、破片速度衰减精度较高;当网格尺寸一致时, SPH方法计算时长约为ALE和CEL方法的两倍,但SPH方法前后处理更加简便。

Comparative study of fluid-filled structure impacted by high-speed spherical fragments based on ALE,CEL and SPH

In order to study the difference of ALE,CEL and SPH methods in the fluid-solid interaction dynamics of high-speed impact,the numerical simulation study on the fluid-filled structure of spherical fragments under high-speed impact was carried out.Based on the verified dynamic model,the fluid pressure change,cavity size,fragment velocity attenuation change and fluid-filled structure deformation were studied respectively.And the corresponding calculation cost was also analyzed.The results show that ALE,CEL and SPH can effectively simulate the fluid-solid interaction dynamic process of the fluid-filled structure under high-speed impact of fragments.Then ALE can predict the cavity size with high accuracy.On the other hand,CEL can predict the fluid pressure,fragment velocity attenuation and fluid-filled structure deformation with high accuracy.But SPH can predict the cavity size and fragment velocity attenuation with high accuracy.When the mesh size is the same,the calculation time of SPH method is about twice those of ALE and CEL methods.However,the pretreatment and post-processing of SPH method are more convenient.