The interaction of a bluff body with a vortex wake

A theoretical, experimental and numerical study is presented of the interaction of a vortex–wake created by an upstream blade with a downstream prismatic block. The aim of the study is to investigate the fundamentals of force and noise generation for this type of flow and explain how inter-object sp...

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Bibliographic Details
Published in:Journal of fluids and structures 2009-07, Vol.25 (5), p.867-888
Main Authors: Leclercq, D.J.J., Doolan, C.J.
Format: Article
Language:English
Subjects:
Acoustics
Computational fluid dynamics
Curle's formulation
Exact sciences and technology
Fluid dynamics
Fluid flow
Fundamental areas of phenomenology (including applications)
Mathematical models
Noise
Noise levels
Phase relationships
Physics
Separation
Structural acoustics and vibration
Turbulent flows, convection, and heat transfer
Unsteady
Vortex–wake interaction
Vortices
Wakes
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Summary:A theoretical, experimental and numerical study is presented of the interaction of a vortex–wake created by an upstream blade with a downstream prismatic block. The aim of the study is to investigate the fundamentals of force and noise generation for this type of flow and explain how inter-object spacing affects the far-field noise level. A theoretical model, based on a compact form of Curle's formulation, is developed and shows that acoustically constructive or destructive interference is determined by the amplitude and phase of the forces on each object. Experimental and two-dimensional, unsteady numerical results of the vortex–wake interaction case are presented for several blade–block separation distances. Using a combination of experimental and numerical data, the theoretical model is able to explain observed variations in far-field noise level with blade–block separation distance. The numerical model accurately predicts the phase relationship between the unsteady forces on each object.
ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2009.02.005