本文根据摄动理论中的Plindstedt——Poincare方法,提出了一种在规则边界面上具有弧立突体的湍流场计算新方法,即在突体附近的规则边界流动区域进行局部坐标摄动变形,然后利用不可压粘性流体流动的有限元法求解N～S方程.该方法成功地模拟了二维等腰三角形弧立突体后不恒定分离流的回流,通过与相平行的试验结果比较表明,两者吻合良好. According to the Plindstedt - Poincare method in perturbation theory, a new method for calculating turbulent flow fields with curved protuberances on regular boundary surfaces is presented in this paper. The local perturbation deformation , Then the N ~ S equation is solved by using the finite element method of incompressible viscous fluid flow.This method successfully simulates the backflow of 2-dimensional isosceles triangular arc-shaped protuberances which is not consistent with the separation flow, which is shown by comparison with the experimental results , Both agree well.