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An experimental investigation of the recirculation zone formed downstream of a forward facing step

Sherry, Michael and Lo Jacono, David and Sheridan, John An experimental investigation of the recirculation zone formed downstream of a forward facing step. (2010) Journal of Wind Engineering & Industrial Aerodynamics, vol. 98 (n° 12). pp. 888-894. ISSN 0167-6105

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Official URL: http://dx.doi.org/10.1016/j.jweia.2010.09.003

Abstract

An experimental investigation of the recirculation zone formed downstream of a forward facing step immersed in a turbulent boundary layer has been undertaken using particle image velocimetry. Bluff body flow is observed with the fixed separation point located at the leading edge of the step. The recirculation region dimensions are characterised over a range of Reynolds numbers (1400–19 000), with Reh based on the step height and the free stream velocity. Turbulent perturbations are produced in the free shear layer which develops between the recirculating flow close to the step and the free stream flow. Contour maps of amplification factor, streamwise perturbation velocity and Reynolds stresses are constructed, providing insight into optimal placement of structures within such topographical features. The mechanisms affecting the reattachment distance, namely the turbulent mixing within the boundary layer and the velocity deficit in the boundary layer, are discussed.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Wind Engineering & Industrial Aerodynamics website : http://www.sciencedirect.com/science/journal/01676105
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Monash University (AUSTRALIA)
Laboratory name:
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Deposited By: David LO JACONO
Deposited On:12 Jul 2012 15:12

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