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The Concept of Virtual Penetration and Its Application in Risers With Multiple Contacts

[+] Author Affiliations
Yousun Li

Shell Global Solutions, Houston, TX

Paper No. OMAE2002-28219, pp. 459-465; 7 pages
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3611-8 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME


Marine risers may involve multiple contacts, such as a marine riser consisting of centralized multi-tubes, and a riser with a trumpet bending restrainers. An algorithm has been developed specially for the time-domain simulation of the riser motions with a large number of intermittent contacts. In this algorithm, the contact constrains are lifted, and a pair of contact forces for each contact is added to the applied loads in the global equilibrium equations. Each pair of contact loads are either large enough to keep the wall penetration within a specified tolerance, or vanish when the contact pair is separated. These contact loads can be obtained by iterations, based on a concept called “viavirtual penetrationl”. Through a dual casing riser as an example, the time records of the riser motions are simulated by the algorithm of virtual penetration and by modeling contacts as nonlinear springs. These two results are in good agreement. However, the algorithm developed herein can handle much more intermittent contacts than other methods.

Copyright © 2002 by ASME
Topics: Pipeline risers



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