Abstract
Numerical analysis has been performed for three-dimensional developing turbulent flow in a U-bend of strong curvature with rib-roughened walls by using an algebraic Reynolds stress model. Special attention is paid for the developing turbulent flow in U-bend with positive and negative rotations in this study. It has been pointed out as a characteristic features from the experimental result that positive rotation leads to a more uniform velocity distribution within bend, whereas, the high momentum fluid remains closer to the inner side with negative rotation. The present method could relatively predict such velocity profiles and reproduce the separated flow generated near the outer wall which is just located at downstream of curved duct.
