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Numerical characterization of three-dimensional bluff body shear layer behaviour

Published online by Cambridge University Press:  21 June 2016

Daniel T. Prosser  and
Marilyn J. Smith
Daniel T. Prosser*
Affiliation:
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
Marilyn J. Smith
Affiliation:
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
*
†Email address for correspondence: dpross1100@msn.com
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Abstract

Three-dimensional bluff body aerodynamics are pertinent across a broad range of engineering disciplines. In three-dimensional bluff body flows, shear layer behaviour has a primary influence on the surface pressure distributions and, therefore, the integrated forces and moments. There currently exists a significant gap in understanding of the flow around canonical three-dimensional bluff bodies such as rectangular prisms and short circular cylinders. High-fidelity numerical experiments using a hybrid turbulence closure that resolves large eddies in separated wakes close this gap and provide new insights into the unsteady behaviour of these bodies. A time-averaging technique that captures the mean shear layer behaviours in these unsteady turbulent flows is developed, and empirical characterizations are developed for important quantities, including the shear layer reattachment distance, the separation bubble pressure, the maximum reattachment pressure, and the stagnation point location. Many of these quantities are found to exhibit a universal behaviour that varies only with the incidence angle and face shape (flat or curved) when an appropriate normalization is applied.

JFM classification

Aerodynamics: Aerodynamics Mathematical Foundations: Computational methods Turbulent Flows: Turbulent Flows

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Type
Papers
Information
Journal of Fluid Mechanics , Volume 799 , 25 July 2016 , pp. 1 - 26
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© 2016 Cambridge University Press 

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