An application of in situ adaptive tabulation method in numerical simulation of gaseous detonation
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摘要: 为减少反应流计算花费的时间，采用动态存储建立热力学数据表（In situ adaptive tabulation, ISAT）的方法来取代反应流计算中化学反应的直接积分（Direct integral, DI），并针对气相H2/O2爆轰波的传播过程进行了数值模拟。采用两种不同的ISAT误差放大判据对一维爆轰波的压力、温度及组分变化进行了计算，并和DI的结果进行了比较以考察其计算精度。此外，还探讨了ISAT方法的效率。计算结果表明，和DI方法相比，在爆轰波传播计算中ISAT方法计算误差小于3％，化学反应计算速度提高了8倍。Abstract: To reduce the CPU time cost by reactive flow calculations, the direct integral (DI) of chemical reactions is replaced by an in situ adaptive tabulation (ISAT) method. The ISAT method with two enlargement criterions of calculated error is used to numerically simulate the gaseous detonation process for H2/O2 mixture. The calculated pressure, temperature and mass fractions of species by ISAT are compared with those by DI to verify the accuracy of the ISAT. The computed CPU time and find, enlargement and record process of data in ISAT, which represent the calculated efficiency of ISAT, are discussed. Compared with those by DI method, the calculated errors by ISAT method are no more than 3% and the calculated efficiency of ISAT is improved 8 times. It is concluded that the ISAT method shows the advantage in the calculations of detonation wave propagation.
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