Research Article
Jun 1975

Fluid-Dynamic Excitation Involving Flow Instability

Publication: Journal of the Hydraulics Division
Volume 101, Issue 6

Abstract

Most flow-induced structural vibrations can be traced to shear-layer instability. They are generated by feedback mechanisms through which disturbances to the free shear layer are self-generated and amplified with an inherent dominant frequency and pressure fluctuations are produced over any portion of the body surface near the free shear layer. The range of flow conditions within which such vibrations may occur for given mechanical and geometrical properties of the structure is predicted by means of a kinematic analysis based on some results of stability theory and experiments. Verification of the validity of the analysis is provided by a comparision with tests for a typical hydraulic structure: a high-head gate with downstream lip. The results give support to the general applicability of this method for the determination of flow conditions under which structural vibrations can be excited.

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Published In

Journal of the Hydraulics Division
Volume 101Issue 6June 1975
Pages: 681 - 698

History

Published in print: Jun 1975
Published online: Feb 3, 2021

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Wallace W. Martin
Asst. Prof., Dept. of Mech. Engrg., Univ. of Toronto Toronto, Canada; formerly, Research Assoc., Inst. of Hydromechanics, Univ. of Karlsruhe, Karlsruhe, Germany
Eduard Naudascher, F.ASCE
Prof. of Civ. Engrg. and Dir., Inst. of Hydromechanics, Univ. of Karlsruhe, Karlsruhe, Germany
Mahadevan Padmanabhan
Grad. Student, School of Civ. Engrg., Georgia Inst. of Tech., Atlanta, Ga.; formerly, Research Asst., Inst. of Hydromechanics, Univ. of Karlsruhe, Karlsruhe, Germany

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