摘要
发展基于隐式双时间步法的化学非平衡流解耦型计算方法.采用算子分裂法对流动和反应进行解耦处理,流动方程组通过双时间步方法求解;源项方程组采用二阶梯形公式迭代求解;提出"源项消去"法,以消除化学反应源项对流动求解引入的误差,从而保证流动方程组求解的时间精度.理论分析和计算结果表明,方法既可以保证双时间步法的求解效率,又可以获得比较精确的非定常计算结果.
An uncoupled method based on an implicit dual time-step approach for nonequilibrium flows is developed. Flow and reaction are separated by using operator-splitting method. Flow equations are solved by a dual time-step approach and source equations are solved by 2nd order trapezoidal formulas. A source-eliminating method is designed to remove error imposed to the solution by chemical source, which is very effective to assure time precision of flow-solving. Analysis and computations suggest that the method maintains efficiency of dual time-step approach as well as precision of unsteady computational results.
出处
《计算物理》
EI
CSCD
北大核心
2010年第5期685-691,共7页
Chinese Journal of Computational Physics
关键词
化学非平衡
算子分裂
双时间步法
“源项消去”法
chemical nonequilibrium
operator-splitting
dual time-step approach
source-eliminating method
