International Journal of Fluid Dynamics (1998),
Vol. 2, Article 1
Simulated Flow around Long Rectangular Plates under Cross Flow Perturbations
B.T. Tan, M.C. Thompson, K. Hourigan
Fluid-dynamics Laboratory for Aeronautical and Industrial Research
(FLAIR)
Department
of Mechanical Engineering,
Monash University, Clayton, Victoria, Australia
(First received 5th June 1998; and in revised form 30th November
1998.
Published 22nd December 1998.)
Abstract
Numerical simulations of flow past long rectangular plates of various aspect
ratios are performed. Comparisons are made with previous experimental and
computational results. Simulations without external forcing show
the stepwise increase in Strouhal number based on chord length characteristic
of the Impinging Shear Layer Instability; in the present case, the shear layer develops into
shed vortices upstream of the impingement for longer plates.
Simulations with a small amplitude crossflow oscillatory
forcing also exhibit a similar receptivity at these Strouhal numbers. This
is demonstrated by Strouhal number stepping corresponding to local
maxima of base suction as the plate aspect ratio is varied. Flow
visualisations and animations indicate that the stepping corresponds
to a similar integer mode of shedding as observed in the unperturbed case
and reveals the phase relationship between leading- and trailing-edge shedding.
Keywords
Copyright Notice
Abstract
Next Section: 1. Introduction
2. Numerical Technique
3. Results and Discussion
4. Conclusions
Acknowledgements
References