Pressure-Strain-Rate Model Including Effect of Streamline Curvature and Prediction of Turbulent Swirling Pipe Flow : 2nd Report, Numerical Prediction of Turbulent Decaying Swirling Flow in a Long Pipe

Abstract

Numerical predictions employing three types of stress equation models, which are those of Launder et al., Gibson-Younis and the authors' are conducted and compared with an experiment of turbulent decaying swirling flow in a long circular pipe. The accuracy of the prediction with the authors' model is demonstrated as compared with those of Launder et al. and Gibson-Younis. Characteristic momentum transport induced by swirl is interpreted with respect to the interaction between production and pressure-strain-rate terms. In particular, it is stressed that it is important to consider the effect of isotropization on source-like terms which appear in convection terms.