Excitation and evolution of waves on an inhomogeneous flexible wall in a mean flow
UNSPECIFIED (2003) Excitation and evolution of waves on an inhomogeneous flexible wall in a mean flow. In: 5th International Symposium on Fluid-Structure Interaction, Aeroelasticity, Flow-Induced Vibration and Noise, NEW ORLEANS, LA, NOV, 2002. Published in: JOURNAL OF FLUIDS AND STRUCTURES, 18 (2). pp. 251-267.Full text not available from this repository.
Official URL: http://dx.doi.org/10.1016/j.jfluidstructs.2003.07....
The excitation of neutrally stable small-amplitude waves in a system comprising uniform flow over a flexible wall is studied. Linear theory and numerical simulation are used. A feature of wave excitation in such systems is that distinct amplitude ratios exist when more than one wave is present. An amplitude-ratio equation is first derived for the two waves excited directly by oscillatory excitation applied to a spatially homogeneous plate-spring flexible wall. Thereafter, a second amplitude-ratio equation is derived for waves on a wall with spatially varying foundation-spring stiffness coefficient. In this case, waves beyond a region of changing flexibility are continuously excited by waves propagating through the region of change. Alternatively, it can be considered that an incoming wave evolves into the outgoing wave that emerges from the region of changing wall flexibility. Both energy-flux and WKB methods are used to derive the final amplitude-ratio equation. The theory holds for both upstream- and downstream-propagating waves. It is shown, inter alia, that the waves on either side of the region of slowly changing wall properties are well-described by the dispersion equation based upon local wall properties. Finally, the case of waves incident upon a region of rapidly changing wall properties is simulated and discussed. (C) 2003 Elsevier Ltd. All rights reserved.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||T Technology > TJ Mechanical engineering and machinery|
|Journal or Publication Title:||JOURNAL OF FLUIDS AND STRUCTURES|
|Publisher:||ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD|
|Official Date:||September 2003|
|Number of Pages:||17|
|Page Range:||pp. 251-267|
|Title of Event:||5th International Symposium on Fluid-Structure Interaction, Aeroelasticity, Flow-Induced Vibration and Noise|
|Location of Event:||NEW ORLEANS, LA|
|Date(s) of Event:||NOV, 2002|
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