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Computational study of decaying annular vortex flow using the r ε/k-ε turbulence model

M. Saqr, Khalid and Kassem, Hassan I. and Aly, Hossam S. and Abdul Wahid, Mazlan (2012) Computational study of decaying annular vortex flow using the r ε/k-ε turbulence model. Applied Mathematical Modelling, 36 (10). pp. 4652-4664. ISSN 0307-904X

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Official URL: https://dx.doi.org/10.1016/j.apm.2011.11.082

Abstract

In this article, we present three dimensional CFD study of turbulent vortex flow in an annular passage using OpenFOAM 1.6. The vortex flow is generated by introducing the flow through a tangential entry to the passage. For the analysis presented in this article, turbulence was modeled using the Rε/k − ε model, in addition, a comparison between such model with the standard k − ε model was conducted and discussed. The main characteristics of the flow such as vortex structure and recirculation zone were investigated. It was found that flow is subjected to Rankine vortex structure with three forced vortex regimes and a free vortex region near to the outer wall. The phenomenon of vortex decay was investigated by depicting the swirl number trend along the axial direction of the flow domain. It was found that the vortex decay is subjected to an exponential decay behavior. New coefficients for the exponential decay correlation were derived based on local values of velocity components in different radial planes.

Item Type:Article
Uncontrolled Keywords:Mathematical modelling
Subjects:Q Science > QA Mathematics
Divisions:Mechanical Engineering
ID Code:46724
Deposited By: Haliza Zainal
Deposited On:22 Jun 2015 05:56
Last Modified:30 Sep 2017 00:46

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