Full Content is available to subscribers

Subscribe/Learn More  >

Transient Waterhammer Force and Pipe Response Using Fluid and Structural Coupling

[+] Author Affiliations
E. Prado, F. J. Moody

General Electric Nuclear Energy, San Jose, CA

Paper No. IMECE2003-55003, pp. 29-34; 6 pages
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Recent Advances in Mechanics of Solids and Structures
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-3726-2 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME


The problem presented in this report is intended to be instructive. It is designed to be a step by step approach on how pipe response due to waterhammer can be solved using fundamental engineering principles. When fluid accelerates in a piping system, the pipe experience a reaction force that is equal and opposite to the force exerted by the fluid. The relationship between fluid and structural behaviors in this type of problem can be analyzed by the fluid-structure coupling approach. This methodology takes the decoupled fluid force, predicted for a rigid pipe, and applies it to the dry pipe with an added hydraulic mass to obtain the exact coupled pipe motion response. To demonstrate the application of the fluid-structure coupling approach, an analysis of waterhammer effects due to valve closure is performed on a horizontal pipe with elbows attached to two vertical segments at both ends; both instantaneous and ramp-in-time valve closures are modeled. The analysis starts first by determining whether the fluid response corresponds to bulk flow or propagative flow. Then from conservation of mass and momentum equations, employed with the space-time diagram, the transient forcing function on the stationary, rigid horizontal pipe is determined. By modeling the two vertical piping segments as cantilever beams, and adding the appropriate hydraulic mass to the dry pipe, the piping response can be obtained. As a result, the piping response is a function of pipe geometry, initial fluid velocity, mass of pipe and fluid, and pipe stiffness. Given this fluid-structure coupled function, one can predict the maximum deflection of the pipe and the stresses induced on the pipe restraints.

Copyright © 2003 by ASME
Topics: Force , Fluids , Pipes



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In