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Momentum and heat transport in a three-dimensional transitional wake of a heated square cylinder

Published online by Cambridge University Press:  27 October 2009

L. DJENIDI  and
R. A. ANTONIA
L. DJENIDI*
Affiliation:
Discipline of Mechanical Engineering, School of Engineering, University of Newcastle, Newcastle 2308 NSW, Australia
R. A. ANTONIA
Affiliation:
Discipline of Mechanical Engineering, School of Engineering, University of Newcastle, Newcastle 2308 NSW, Australia
*
†Email address for correspondence: lyazid.djenidi@newcastle.edu.au
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Abstract

The transport of momentum and a passive scalar (temperature) in a three-dimensional transitional wake of a heated square cylinder has been carried out through direct numerical simulations using the lattice Boltzmann method at a Reynolds number Rd = 200 (d is the cylinder diameter) and a Prandlt number of 0.7. The simulations shows that while momentum and heat are transported by vortical structures, heat is in general more effectively transported than momentum. It is argued that the nature of the structural flow is responsible for the longitudinal heat flux uθ being larger than the lateral one vθ in the wake region extending up to 45d. It was shown that a gradient transport model could, to a first-order approximation, be used to model uv but would be less accurate for modelling vθ. Also the Reynolds analogy between momentum and heat transports is not verified in this flow. The fluctuating temperature field presents thermal structures similar to the velocity structures with, however, a different spatial organization. In addition the analogy between fluctuating turbulent kinetic energy and the temperature variance is relatively well satisfied throughout the wake flow.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 640 , 10 December 2009 , pp. 109 - 129
Copyright
Copyright © Cambridge University Press 2009

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