Fluid-Dynamic Excitation Involving Flow Instability

by Wallace W. Martin, Asst. Prof.; Dept. of Mech. Engrg., Univ. of Toronto, Canada; formerly, Research Assoc., Inst. of Hydromechanics, Univ. of 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,
Eduard Naudascher, (F.ASCE), Prof. of Civ. Engr., and Dir.; Inst. of Hydromechanics, Univ. of Karlsruhe, Karlsruhe, Germany,

Serial Information: Journal of the Hydraulics Division, 1975, Vol. 101, Issue 6, Pg. 681-698

Document Type: Journal Paper


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.

Subject Headings: Vibration | Excitation (physics) | Fluid flow | Shear flow | Free surfaces | Geometrics | Mechanical properties | Structural behavior

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