Proposal of a New Algebraic Stress Model and its Application to a Compound Channel Flow

Abstract

An algebraic stress turblence model is developed to reproduce turbulent flows with turbu-lence-driven secondary currents in ducts of arbitrary cross-section. The model is obtained as an extension of the k-ε model to include non-linear effects of the mean rate of strain. The expression of the non-linear terms in the model is derived from Launder-Reece-Rodi model with neglecting advection and diffusion terms. Then, the model is applied to a compound channel flow to test its validity. Comparison between calculated results and experimental data reveals that the present model can reproduce mean flow field as well as Reynolds stress distributions.