计算物理 ›› 2000, Vol. 17 ›› Issue (5): 518-524.

• 论文 • 上一篇    下一篇

机翼跨声速非定常绕流IA型反命题变域变分有限元解

郭加宏, 刘高联   

  1. 上海大学 上海市应用数学和力学研究所, 上海 200072
  • 收稿日期:1999-01-28 出版日期:2000-09-25 发布日期:2000-09-25
  • 作者简介:郭加宏(1966~),男,浙江嘉兴,副教授,硕士,从事计算流体力学,流体机械及工程方面的研究,上海市延长路149号189信箱200072.

VARIABLE DOMAIN VARIATIONAL FINITE ELEMENT APPROACH TO IA INVERSE PROBLEM OF UNSTEADY TRANSONIC FLOW AROUND OSCILLATING AIRFOILS

GUO Jia-hong, LIU Gao-lian   

  1. Shanghai Institute of Applied Math & Mech, Shanghai University, Shanghai 200072, P R China
  • Received:1999-01-28 Online:2000-09-25 Published:2000-09-25

摘要: 以文[1]提出的二维振荡机翼含激波跨声速非定常绕流IA型反命题变分原理为基础,构建求解IA型反命题的有限元解法。构造了三维时空可变节点有限元来捕获自由尾涡面和翼面几何形状,跨声速流中的激波用人工密度法捕获。在远场边界上采用简化的无反射边界条件,新型非定常Kutta条件被用于处理尾缘条件。用该方法,根据翼型跨声速非定常绕流翼面压力分布求解IA型反命题,得到了NACA64A010翼型的几何形状,计算结果令人满意。

关键词: 机翼绕流, 跨声速非定常流, 反命题, 变分有限元

Abstract: On the basis of the variational principles developed in Ref[1], a finite element method(FEM) is constituted for soluting the inverse problem of 2-D unsteady transonic flow around oscillating airfoils, incorporating the non-reflecting far-field boundary conditions and a new unsteady Kutta condition[7]. All unknown boundary(airfoil contour) and discontinuities(shocks and free trailing vortex sheets) are handled(captured) via the functional variation with variable domain and artificial density concept. For the numerical realization of variable-domain variation, a special finite element with self-adjusting nodes is also suggested herein. The numerical results show that the present method is effective for the design of unsteady airfoil.

Key words: airfoil, transonic flow, inverse problem, variational finite element

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