Abstract

Computations were performed to study the threedimensional flow and heat transfer inside a smooth and a ribbed U-shaped duct of square cross section with a tightly wound 180-degree bend under rotating and non-rotating conditions. Results are presented which show how flows induced by Coriolis force and centrifugal buoyancy in the smooth portion of the duct are affected by secondary flows induced by ribs and by a 180-degree bend. The computations are based on the ensemble-averaged conservation equations of mass, momentum (compressible Navier-Stokes). and energy closed by a low Reynolds number k-o> model of turbulence. Solutions were generated by using a cell-centered finite-volume method based on flux-differen ce splitting and a diagonalized alternating-direction implicit scheme with multigrid.

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