N-S方程数值模拟弹体不可压脱体涡绕流

N-S EQUATION SOLUTIONS FOR INCOMPRESSIBLE VORTICAL FLOWS OVER A TANGENT-OGIVE-CYLINDER

应用在连续方程中增加压力对时间导数项的拟压缩性方法 ,数值求解三维定常不可压N- S方程。采用隐式 Beam- Warming近似因式分解格式求解。以修正的 Baldwin- Lomax代数模型模拟湍流流动。对绕正切拱形旋成柱体的大迎角脱体涡流动进行了数值模拟 ,并分析了层流粘性和湍流粘性对脱体涡及二次分离涡的影响。

The method of pseudocompressibility in which a time derivative pressure term is introduced into the mass conservation equation has been used for numerically solving the three dimensional steady incompressible Navier Stokes equations. The solution procedure employs Beam Warming implicit approximate factorization scheme. The modified Baldwin Lomax algebraic turbulent model is used to numerically simulate high incidence vortical flows about a tangent ogive cylinder. The numerical results are in good agreement with experiment. To reproduce the experimentally observed asymmetric vortices, it was found essential to introduce a small asymmetric jet disturbance near the body apex.