Numerical Investigation of Separation Phenomenon on the Turbulent Axial Flow Downstream of a Circular Cylinder

Abstract

This article presents a numerical investigation of turbulent flow in an axisymmetric separated and reattached flow over a longitudinal blunt circular cylinder. With respect to the complexity of the simulation of the separation phenomenon, some numerical techniques such as discretization methods and pressure-velocity coupling algorithms were compared to reach a proper numerical method to solve the considered flow case. Further, the results of the standard k-ε and shear stress transport (SST) turbulence models were used to predict the effects of turbulence were investigated. Besides, the effects of using the steady and pseudo-transient equations were discussed. Furthermore, a multi-grid method was employed to accelerate the convergence speed. All the numerical techniques were coded and compiled with Fortran 90 compiler. The code and computational method were then validated against experimental data, with good agreement. Finally, the structure of separation and reattachment of the considered flow case was investigated with the numerical code. Some characteristics of the flow such as reattachment length, velocity distributions, turbulent kinetic energy and pressure were discussed.

Keywords

References

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Journal of Solid and Fluid Mechanics
Volume 1, Issue 1 - Serial Number 1
September and October 2011
Pages 71-80

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