Numerical simulations of instabilities in the implosion process of inertial confined fusion in 2D cylindrical coordinates

作者：Yong Heng; Zhai ChuanLei; Jiang Song; Song Peng^*; Dai ZhenSheng; Gu JianFa

来源：Science China Physics,Mechanics & Astronomy, 2016, 59(1): 614704.

DOI：10.1007/s11433-015-5711-6

• material interfaces
• Rayleigh-Taylor instability
• Richtmyer-Meshkov instability
• arbitrary Lagrangian and Eulerian framework
• Moment-of-Fluid method

In this paper, we introduce a multi-material arbitrary Lagrangian and Eulerian method for the hydrodynamic radiative multi-group diffusion model in 2D cylindrical coordinates. The basic idea in the construction of the method is the following: In the Lagrangian step, a closure model of radiation-hydrodynamics is used to give the states of equations for materials in mixed cells. In the mesh rezoning step, we couple the rezoning principle with the Lagrangian interface tracking method and an Eulerian interface capturing scheme to compute interfaces sharply according to their deformation and to keep cells in good geometric quality. In the interface reconstruction step, a dual-material Moment-of-Fluid method is introduced to obtain the unique interface in mixed cells. In the remapping step, a conservative remapping algorithm of conserved quantities is presented. A number of numerical tests are carried out and the numerical results show that the new method can simulate instabilities in complex fluid field under large deformation, and are accurate and robust.

• 出版日期2016-1
• 单位北京应用物理与计算数学研究所