Reynolds Stress Model in the Prediction of Confined Turbulent Swirling Flows

[+] Author and Article Information
Ali M. Jawarneh

Department of Mechanical Engineering,  Hashemite University, Zarqa 13115, Jordanjawarneh@hu.edu.jo

Georgios H. Vatistas

Department of Mechanical and Industrial Engineering, Concordia University 1455 DeMaisonneuve Blvd. West, Montreal, H3G 1M8 Canadavatistas@me.concordia.ca

J. Fluids Eng 128(6), 1377-1382 (Mar 22, 2006) (6 pages) doi:10.1115/1.2354530 History: Received February 09, 2005; Revised March 22, 2006

Strongly swirling vortex chamber flows are examined experimentally and numerically using the Reynolds stress model (RSM). The predictions are compared against the experimental data in terms of the pressure drop across the chamber, the axial and tangential velocity components, and the radial pressure profiles. The overall agreement between the measurements and the predictions is reasonable. The predictions provided by the numerical model show clearly the forced and free vortex modes of the tangential velocity profile. The reverse flow (or back flow) inside the core and near the outlet, known from experiments, is captured by the numerical simulations. The swirl number has been found to have a measurable impact on the flow features. The vortex core size is shown to contract with the swirl number which leads to higher pressure drop, higher peak tangential velocity, and deeper radial pressure profiles near the axis of rotation. The adequate agreement between the experimental data and the simulations using RSM turbulence model provides a valid tool to study further these industrially important swirling flows.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of the vortex chamber

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Figure 2

Inlet flow boundary condition

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Figure 3

Computational domain

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Figure 4

Computational grid near the exit

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Figure 5

Grid independent solution study

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Figure 6

Pressure drop coefficient

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Figure 7

Mean swirl velocity

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Figure 8

Dimensionless mean axial velocity

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Figure 9

Predicted axial velocity vectors near the exit

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Figure 10

Mean radial pressure



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