Numerical investigation of a water flow in a rib-roughened channel by using Reynolds stress model

International journal of computational fluid dynamics

Abstract

Abstract In this paper, water flow in a rib-roughened channel is investigated numerically by using Reynolds stress turbulence models (RSM) on a three-dimensional (3-D) domain. Computational results for mean streamwise velocity component and turbulent kinetic energy show good agreements with available experimental data. Five rib pitch-to-height ratios (p/h) of 1, 5, 10, 15 and 20 are analysed for six different Reynolds numbers (Re) of 3000, 7000, 12,000, 20,000, 40,000 and 65,000. Velocity vectors, streamlines and Reynolds stresses are showed for these ratios and Re numbers. Streamlines revealed that Reynolds numbers do not affect flowfield but play an important role in the Reynolds stresses. Keywords: rib-roughened channelReynolds stress turbulence modelskin frictioncomputational fluid dynamics (CFD)water flow

Keywords

Streamlines, streaklines, and pathlines Reynolds stress Turbulence Reynolds number Mechanics Reynolds stress equation model Turbulence kinetic energy Computational fluid dynamics Reynolds decomposition K-epsilon turbulence model Open-channel flow Physics Mathematics Materials science Geometry Reynolds equation K-omega turbulence model

Subject Areas

Heat Transfer Mechanisms ·Mechanical Engineering ·Physical Sciences

Fluid Dynamics and Turbulent Flows ·Computational Mechanics ·Physical Sciences

Heat transfer and supercritical fluids ·Computational Mechanics ·Physical Sciences

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Numerical investigation of a water flow in a rib-roughened channel by using Reynolds stress model

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