用多次建表的ISAT方法计算激波诱导火焰失稳

Computations of Flame Instability Induced by Shock Wave Using Multiple in Situ Adaptive Tabulation

对减少燃烧反应化学计算时间的动态自适应建表(ISAT)方法进行了改进,采用多次建表的方法计算了激波诱导火焰失稳的二维瞬态过程.计算结果表明,ISAT方法与直接积分计算结果以及实验结果吻合较好,能够满足计算精度的要求.多次建表方法在没有降低ISAT方法效率的前提下,可有效限制数据表容量,总CPU计算时间可减少2.53倍,其中化学反应的CPU计算时间则减少3.75倍.对瞬态燃烧问题而言,多次建表ISAT方法提供了减少燃烧化学反应计算时间的有效思路.

An in situ adaptive tabulation （ISAT） method, which is adopted to enhance the computational performance of combustion chemistry, is developed to numerically simulate the two-dimensional flame instability induced by shock waves. The computational results show that the multiple ISAT method provides sufficient computational accuracy compared with the direct integration method and experimental results. The multiple ISAT method is capable of limiting the size of data table, without lowering the computational efficiency. A total CPU time speedup of 2.53 and a chemical CPU time speedup of 3.75 can be obtained when the multiple ISAT method is applied to the present study. As to or the transient combustion problem, the multiple ISAT method provides an efficient approach for reducing the computational CPU time of combustion chemistry.