A fully developed turbulent flow in an S-bend duct with a rectangular cross-section of 25 degrees curvature is considered. The turbulence model adopted is based on an isotropization of production differential second-model closure. The flow rate is on prescribing a constant pressure gradient,  in the streamwise direction. The numerical scheme adopted for the solution is obtained implicitly on the -plane using the finite-volume formulation and solved via a multigrid method. The A marching scheme is then used to advance the solution in the streamwise z-direction. Two scenarios are considered: (a) the    S-duct without a manipulator and (b) with a manipulator mounted  with the duct. The solutions for mean velocity profiles, turbulent  shear stress and the wall pressure distribution are compared with the available experimental data. The comparison between computations and experimental data is in reasonable agreement.

turbulent flow, second moment closure, multigrid, finite volume.