Journal ArticleDOI
Forces on cylinders in viscous oscillatory flow at low Keulegan-Carpenter numbers
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TLDR
In this article, a comparison between theory and experiment for the in-line forces on cylinders of general cross-section in planar oscillatory flows of small amplitude is presented, where the boundary-layer contribution due to both skin friction and displacement effects is calculated to first order in the Stokes parameter β−½.Abstract:
This paper presents a comparison between theory and experiment for the in-line forces on cylinders of general cross-section in planar oscillatory flows of small amplitude. The theoretical analysis evaluates corrections to the standard inviscid inertial force at low Keulegan-Carpenter numbers which arise from the presence of viscous laminar boundary layers and from the development of vortex shedding. The boundary-layer contribution due to both skin friction and displacement effects is calculated to first order in the Stokes parameter β−½. The contribution to the in-line force from separation and vortex shedding, for which the results presented only apply to sharp-edged bodies, is taken from previous work on vortex shedding from isolated edges using the discrete vortex modelling technique. The resulting force has components both in phase with the fluid acceleration (inertia) and in phase with the velocity (drag).The theoretical results are compared to measurements taken in a [xcup ]-tube water channel on a number of cylinders of different cross-section including circular cylinders and sharp-edged sections. The comparisons suggest that the theory is valid for Keulegan–Carpenter numbers below about 3 and for moderately high values of the β parameter.read more
Citations
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Journal ArticleDOI
The Motion of High-Reynolds-Number Bubbles in Inhomogeneous Flows
Jacques Magnaudet,Ian Eames +1 more
TL;DR: In this article, a trident approach consisting of experimental, analytical, and numerical work has given a clearer description of the hydrodynamic forces experienced by isolated bubbles moving either in inviscid flows or in slightly viscous laminar flows, and a significant part of the paper is devoted to a discussion of drag, added mass force, and shear-induced lift experienced by spheroidal bubbles moving in inertially dominated, time-dependent, rotational, nonuniform flows.
Journal ArticleDOI
Force on a circular cylinder in viscous oscillatory flow at low Keulegan—Carpenter numbers
TL;DR: In this article, the in-line force coefficients for circular cylinders in planar oscillatory flows of small amplitude were compared with the theoretical predictions of Stokes (1851) and Wang (1968).
Journal ArticleDOI
Low-Reynolds-number flow around an oscillating circular cylinder at low Keulegan–Carpenter numbers
TL;DR: In this article, the authors performed time-averaged LDA measurements and time-resolved numerical flow predictions to investigate the laminar flow induced by the harmonic in-line oscillation of a circular cylinder in water at rest.
Journal ArticleDOI
A numerical simulation of vortex shedding from an oscillating circular cylinder
TL;DR: In this article, a physically consistent method is used for the reconstruction of velocity fluxes which arise from discrete equations for the mass and momentum balances, and a comparison of phase-averaged velocity vectors between measurements and predictions is presented.
Journal ArticleDOI
A visual study of the flow around an oscillating circular cylinder at low Keulegan–Carpenter numbers and low Stokes numbers
M. Tatsuno,Peter W. Bearman +1 more
TL;DR: In this paper, the structures of the flow induced by a circular cylinder performing sinusoidal oscillations in a fluid at rest are investigated by means of flow visualization, and the experiments are carried out at Keulegan-Carpenter numbers between 1.6 and 15 and at Stokes numbers between 5 and 160.
References
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The Force Exerted by Surface Waves on Piles
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Forces on cylinders and plates in an oscillating fluid
G.H. Keulegan,L.H. Carpenter +1 more
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On high-frequency oscillatory viscous flows
TL;DR: In this paper, the equations governing high-frequency oscillatory viscous flows are investigated through the separation of the steady and the unsteady parts All Reynolds number ranges are studied and the orders of magnitude of the Steady streaming produced by the Reynolds stresses are established.