This study addresses the natural convection flow driven by a heated square cylinder within an air-filled enclosure for parameter values corresponding to the onset of unsteadiness and weakly transitional flow regime. 2D time-resolved PIV measurements are jointly used with 2D and 3D numerical simulations, either with full or linearized equations, to study the intrinsic 3D flow instabilities. Two types of vortical structures develop within the enclosure in the parallel and transverse directions to the cylinder axis. The interaction between these convective cells initiates an unsteady flow regime characterized by large scale eddies swaying around the cylinder and wave oscillations which lead to the generation of peculiar hook-shaped structures. Statistical and spectral analyses of the flow help pointing up some noticeable features of this unsteady flow such as the spectrum of the longitudinal spatial modes that reveals a turbulence-like pattern with unconventional slopes in the inertial and dissipative zones.
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2010 14th International Heat Transfer Conference
August 8–13, 2010
Washington, DC, USA
Conference Sponsors:
- Heat Transfer Division
ISBN:
978-0-7918-4942-2
PROCEEDINGS PAPER
Experimental and 3D Numerical Investigation of Buoyancy-Driven Instabilities Around a Heated Horizontal Square Cylinder Within an Enclosure
Gillian Leplat,
Gillian Leplat
ONERA - The French Aerospace Lab, Toulouse, France
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Philippe Reulet,
Philippe Reulet
ONERA - The French Aerospace Lab, Toulouse, France
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Pierre Millan,
Pierre Millan
ONERA - The French Aerospace Lab, Toulouse, France
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Yann Fraigneau,
Yann Fraigneau
Universite´ Paris-Sud, Orsay, France
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Patrick Le Que´re´
Patrick Le Que´re´
Universite´ Paris-Sud, Orsay, France
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Gillian Leplat
ONERA - The French Aerospace Lab, Toulouse, France
Philippe Reulet
ONERA - The French Aerospace Lab, Toulouse, France
Pierre Millan
ONERA - The French Aerospace Lab, Toulouse, France
Yann Fraigneau
Universite´ Paris-Sud, Orsay, France
Patrick Le Que´re´
Universite´ Paris-Sud, Orsay, France
Paper No:
IHTC14-22259, pp. 209-214; 6 pages
Published Online:
March 1, 2011
Citation
Leplat, G, Reulet, P, Millan, P, Fraigneau, Y, & Le Que´re´, P. "Experimental and 3D Numerical Investigation of Buoyancy-Driven Instabilities Around a Heated Horizontal Square Cylinder Within an Enclosure." Proceedings of the 2010 14th International Heat Transfer Conference. 2010 14th International Heat Transfer Conference, Volume 7. Washington, DC, USA. August 8–13, 2010. pp. 209-214. ASME. https://doi.org/10.1115/IHTC14-22259
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