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Drag on flat plates of arbitrary porosity

Published online by Cambridge University Press:  29 August 2018

K. Steiros*
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, 41 Olden St, Princeton, NJ 08544, USA
M. Hultmark
Affiliation:
Department of Mechanical and Aerospace Engineering, Princeton University, 41 Olden St, Princeton, NJ 08544, USA
*
Email address for correspondence: [email protected]

Abstract

A new model for the drag force on a two-dimensional flat plate of arbitrary porosity, oriented normal to the free stream, is introduced. The model is an extension of that introduced by Koo & James (J. Fluid Mech., vol. 60(3), 1973, pp. 513–538), where the performance at low porosities is improved by including a base-suction term. The additional drag due to the base suction is calculated implicitly using momentum theory, which makes the model self-contained. The model predictions exhibit convincing agreement with experimental observations over a wide range of porosities, including the solid case, as long as shedding is absent or suppressed.

Type
JFM Rapids
Copyright
© 2018 Cambridge University Press 

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