【摘要】 SIMPLE算法是求解不可压缩流体流动 Navier-Stokes方程数值解应用非常广泛的算法 .但是在求解非稳态流体流动问题时 ,对非稳态项的处理一直是个棘手问题 .本文扼要介绍了 SIMPLE算法的基本思想 ,重点阐述非稳态流场的数值计算中密度和压力的时间不均匀性对非稳态项的影响 .通过对气相密度的修正和压力修正方程的改进 ,达到改进非稳态源项的目的 ,从而使解收敛 .结果表明 ,对 SIMPLE算法的新改进可以得到非稳态流体流动的流场更多还原

【Abstract】 The SIMPLE algorithm proposed in 1972 by Patankar and Spalding has been widely used in numerical simulation of incompressible fluid flow.While in calculation of unsteady state problems,the transient terms are always knotty problems to deal with.The present paper gives a brief introduction to the basic principle of SIMPLE algorithm and lays emphasis on the idea about the new modified SIMPLE algorithm,in which the nonuniform of density and pressure resulted from unsteady flow was considered.In order to get the convergent solution,the transient term was modified by the modification of the fluid density and the pressure equation.The results of simulation showed that the new modification of SIMPLE algorithm could give the stable solution for unsteady incompressible fluid flow.更多还原