激光烧蚀瑞利-泰勒不稳定性数值研究

NUMERICAL STUDY OF LASER ABLATIVE RAYLEIGH-TAYLOR INSTABILITY

介绍了激光烧浊流体不稳定性计算程序ＥＵＬ３Ｄ，其计算结果与Ｔａｋａｂｅ公式、ＦＡＳＴＺＤ程序和ＬＡＳＮＥＸ程序的结果以及日本大顾大学激光烧蚀瑞利一泰勒（ＲＴ）不稳定性实验，都较好符合，发现了横向电子热传导烧蚀在长波长扰动的非线性瑞利一泰勒不稳定性演变中起重要作用。在合理近似下，得到了烧蚀ＲＴ不稳定性线性增长率的预热致稳公式。此公式除包含了烧蚀对流致稳和密度梯度致稳因素外，还包含了ＡｔＷ。。ｄ数变小致稳因素，因此与各种情况的二维计算值都很好符合。

Physical equations, numerical methods and slide grids of laser ablative hydrodynamic instability in the code EUL3D are introduced. Simulation results of the EUL3D code are good agreements withthose of the Takabe formula, the FASTZD code and the LASNEX code,and the experimental result of laserablative Rayleigh-Taylor instability in Osaka University. The lower Atwood stabilization due to the preheatis observed in simulations and a new growth rate formula is obtained. It includes the density gradient, thelower Atwood number and the ablative convection stabilizations, so it agrees well with all of 2D simulations.