Journal article

Wake structure of a transversely rotating sphere at moderate Reynolds numbers

M Giacobello, A Ooi, S Balachandar

Journal of Fluid Mechanics | CAMBRIDGE UNIV PRESS | Published : 2009

Abstract

The uniform flow past a sphere undergoing steady rotation about an axis transverse to the free stream flow was investigated numerically. The objective was to reveal the effect of sphere rotation on the characteristics of the vortical wake structure and on the forces exerted on the sphere. This was achieved by solving the time-dependent, incompressible Navier-Stokes equations, using an accurate Fourier-Chebyshev spectral collocation method. Reynolds numbers Re of 100, 250 and 300 were considered, which for a stationary sphere cover the axisymmetric steady, non-axisymmetric steady and vortex shedding regimes. The study identified wake transitions that occur over the range of non-dimensional ro..

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University of Melbourne Researchers