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Technical Brief

Characteristics of turbulent flows over forward facing steps in adverse pressure gradients based on two-point analyses

[+] Author and Article Information
Hassan Iftekhar

University of Ontario Institute of Technology 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
Hassan.Iftekhar@uoit.ca

Martin Agelin-Chaab

University of Ontario Institute of Technology 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
martin.agelin-chaab@uoit.ca

1Corresponding author.

ASME doi:10.1115/1.4036666 History: Received September 05, 2016; Revised April 02, 2017

Abstract

This study reports the results of turbulent flows on forward facing steps (FFS) in pressure gradients using a particle image velocimetry (PIV) technique to obtain data up to 68 step heights downstream. The contours of two-point velocity correlations indicate that regardless of the pressure gradients, the physical size of the coherent structures characterized by the auto-correlations grow as the flow develops downstream along the step. Additionally, adverse pressure gradient (APG) elevates the size of the auto-correlations.

Copyright (c) 2017 by ASME
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