FLUID-DYNAMIC EXCITATION INVOLVING FLOW INSTABILITY

Most flow-in-duced 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.

• Corporate Authors:

  American Society of Civil Engineers

  345 East 47th Street
  New York, NY  United States  10017-2398
• Authors:
  • Martin, W W
  • Naudascher, E
  • Padmanabhan, M
• Publication Date: 1975-6

Media Info

• Features: References;
• Pagination: p. 681-698
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 101
  • Issue Number: 6
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Atmospheric pressure; Shear stress; Unsteady flow; Walls
• Old TRIS Terms: Flow stability; Pressure fluctuations; Wall shear stress
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00126810
• Record Type: Publication
• Source Agency: Engineering Index
• Files: TRIS
• Created Date: Nov 5 1975 12:00AM