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Drag on flat plates of arbitrary porosity

Published online by Cambridge University Press:  29 August 2018

K. Steiros Open the ORCID record for K. Steiros [Opens in a new window]  and
M. Hultmark
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: ksteiros@princeton.edu
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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.

JFM classification

Nonlinear Dynamical Systems: Low-dimensional models Wakes/Jets: Wakes
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 853 , 25 October 2018 , R3
Copyright
© 2018 Cambridge University Press 

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