Author(s)

S.C.M. Yu

Abstract

Turbulent flow calculations in S-shaped diffusing ducts using a viscous marching technique S.C.M. Yu* Fluids Section, Department of Mechanical Engineering, Imperial College of Science, Technology and Medicine, University of London, ABSTRACT Three-dimensional turbulent flow characteristics in S-shaped diffusing ducts are computed using a parabolised form of the Navier Stokes equations incorporated with an algebraic mixing length turbulence model. Elliptic effects of the pressure field are accounted for by a potential flow solution plus a viscous correction factor. Iterative calculation methods are therefore not necessary. Thus, a fine grid density can be implemented in the transverse plane to obtain spatial resolution and as a consequence, wall functions are not required in the calculations. Extensive comparison between velocity measurements and computed solutions are reported and the limitations of using this approach are considered. INTRODUCTION The performance of an in

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