强爆炸火球辐射流体自适应网格高精度数值模拟  

High-precision Numerical Simulation of Strong Explosion Fireball with Adaptive Mesh

作　　者：李康 李守先[2] 刘娜 LI Kang;LI Shouxian;LIU Na(Software Center for High Performance Numerical Simulation,China Academy of Engineering Physics,Beijing 100088,China;Institute of Applied Physics and Computational Mathematics,Beijing 100088,China)

机构地区：[1]中物院高性能数值模拟软件中心,北京100088 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《计算物理》2021年第2期146-152,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金(11971070,U1830139)资助项目。

摘　　要：提出一种自适应网格方法,应用于基于Euler方法的强爆炸辐射流体高精度数值求解。通过与Zinn数值结果对比,验证该方法的正确性。研究自适应网格对冲击波和光辐射输出模拟精度的影响,对比不同网格尺度下的计算耗时。在相同的条件下,使用自适应网格与均匀网格加密3倍得到的冲击波超压分布、光辐射输出演化接近,计算效率提升约8.5倍。由此可知,提出的自适应网格方法可用于强爆炸问题的高精度数值模拟,显著地提升模拟精度和模拟效率。A method of adaptive mesh is proposed and simulation of strong explosion radiation hydrodynamics based on Euler method is carried out. To demonstrate feasibility of the approach, comparisons with Zinn’s numerical results are made. It shows that profiles of over-pressure and visible output power with adaptive mesh is close to those with uniform mesh with three times grid number. Meanwhile, the time consumed decrease to 1/8.5. It shows that the adaptive mesh method is feasible in high-precision numerical simulation and accuracy and efficiency are increased prominently.

关 键 词：辐射流体动力学 火球 EULER方法 高精度模拟 自适应网格 

分 类 号：O35[理学—流体力学] O38[理学—力学]