Journal
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
Volume 98, Issue 12, Pages 888-894Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jweia.2010.09.003
Keywords
Flow separation; Recirculation zone; Forward facing step; Wind turbine siting
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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 Re-h 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 (C) 2010 Elsevier Ltd All rights reserved
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