Abstract
Turbulent rectangular-duct flow is studied numerically by using an anisotropic k-ε model. A prominent feature of this model lies in an expression for the Reynolds stress, where the deviation of the Reynolds stress from its isotropic eddy-viscosity representation is taken into account. A wall damping function and a corner function are introduced to impose the no slip boundary condition on solid walls and to properly take the corner effect into account. The results obtained show that calculated turbulence characteristics of rectangular-duct flow are in good agreement with experimental data. Especially, the anisotropy of turbulent intensities as well as secondary flows normal to the mainstream, which the usual k-ε model cannot predict, are well reproduced.
