Turbulent flow computation in a circular U-Bend
1 Laboratory of Naval Aero-Hydrodynamics, Marine Engineering Department, Faculty of Mechanics, USTO MB, P.O. 1505 EL-Mnaouar, Algeria.
2 Laboratory of Aeronautics and Propulsive Systems, Mechanical Engineering Department, Faculty of Mechanics, USTO MB, P.O. 1505 EL-Mnaouar, Algeria.
a Corresponding author: firstname.lastname@example.org
Published online: 25 March 2014
Turbulent flows through a circular 180° curved bend with a curvature ratio of 3.375, defined as the the bend mean radius to pipe diameter is investigated numerically for a Reynolds number of 4.45×104. The computation is performed for a U-Bend with full long pipes at the entrance and at the exit. The commercial ANSYS FLUENT is used to solve the steady Reynolds–Averaged Navier–Stokes (RANS) equations. The performances of standard k-ε and the second moment closure RSM models are evaluated by comparing their numerical results against experimental data and testing their capabilities to capture the formation and extend this turbulence driven vortex. It is found that the secondary flows occur in the cross-stream half-plane of such configurations and primarily induced by high anisotropy of the cross-stream turbulent normal stresses near the outer bend.
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