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FLOW SEPARATION CHARACTERISATION OF A FORWARD FACING STEP IMMERSED IN A TURBULENT BOUNDARY LAYER

Michael John Sherry
Fluids Laboratory for Aerospace and Industrial Engineering, Department of Mechanical and Aerospace Engineering, Monash University, Victoria, 3800, Australia; Department of Mechanical Engineering, University of Calgary, Calgary, Canada

David Lo Jacono
Fluids Laboratory for Aerospace and Industrial Engineering, Department of Mechanical and Aerospace Engineering, Monash University, Victoria, 3800, Australia

John Sheridan
Fluids Laboratory for Aerospace and Industrial Engineering, Department of Mechanical and Aerospace Engineering, Monash University, Victoria, 3800, Australia

Romain Mathis
Walter Basset Aerodynamic Laboratory, Department of Mechanical Engineering University of Melbourne, Victoria, 3010 Australia

Ivan Marusic
Department of Mechanical Engineering, The University of Melbourne, Melbourne, VIC, 3010, Australia

Abstract

Flow separation experiments are conducted in two facilities using particle image velocimetry (PIV) and pressure tappings over a wide Reynolds number range for a forward facing step immersed in a turbulent boundary layer. Bluff body flow is observed with the fixed separation point located at the leading edge of the model. The recirculation region dimensions are characterised over the entire Reynolds number range using the PIV technique. Pressure tappings provide insight into the surface pressure distribution in a recirculation region. The mechanisms affecting the reattachment distance, XL, namely the turbulent mixing within the boundary layer and the velocity deficit in the boundary layer are commented on.