基于WENO和HLLC方法的多相可压缩流体数值模型在水下爆炸领域的应用

Application of Compressible Multi-phase Flows Simulation Model based on WENO and HLLC Method in Underwater Explosion

水下近场爆炸过程中由于爆炸气体与周围流体之间存在着复杂的相互作用,目前商业有限元软件对于多相流体运动的模拟精度难以满足要求,其难点在于多相流体运动界面的捕捉。本文采用γ-model界面捕捉方法,建立了基于五阶WENO重构格式与HLLC近似Riemann求解器的多相可压缩流体数值模型,并进行了典型水下爆炸现象的数值模拟,计算结果与试验对比结果表明,本文的计算方法能较为精确地获得水下爆炸中的载荷特征及气泡演化过程。

The finite element commercial softwares are difficult to meet the simulation of multi-phase flows because of complicated interaction between gas and water in near-field underwater explosion. The biggest challenge lies in capturing the high-order interface between multi-phase flows. The five-order WENO reconstruction and HLLC approximate Riemann solver are used for the discrete control equations based on γ-model interface capturing method,which constitutes a simulation model of high-order compressible multi-phase flows. The model is employed to simulate some typical underwater explosion phenomenon. The calculated and experimental results show that the proposed method could accurately describe the load characteristics and bubble evolution.