Numerical calculation of turbulent corner flows
Two approximations have been presented for predicting local mean velocity and Reynolds stress behaviour in square duct flow. For both cases, the vorticity-generating Reynolds stresses are related to gradients of the mean velocity. Wall proximity effects are introduced in the second approximation by using a new decay function in conjunction with the pressure-strain model proposed by \textit{B. E. Launder}, \textit{G. J. Reece} and \textit{W. Rodi} [J. Fluid. Mech. 68, 537-566 (1975; Zbl 0301.76030)]. The first approximation, however, neglects wall proximity effects. The eddy viscosity is deduced from K, the turbulent energy, and W, a measure of the vorticity fluctuations. It is found that the second approximation performs better than the first approximation when compared with data for fully-developed square duct flow. The second approximation also performs generally better than the model proposed by \textit{W. Rodi}, \textit{I. Celik}, \textit{A. D. Demurren}, \textit{G. Scheyerer} and \textit{E. Skirani}, Proc. 1980-81 AFOSR-HTTM Stanford Conference on Complex Turbulent Flows (1981)] which is based on the K-\(\epsilon\) model.
scientific article; zbMATH DE number 3950025