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Determining the Hydrodynamic Coefficients of a BOP

[+] Author Affiliations
Samuel Holmes

Red Wing Engineering, Inc., Palo Alto, CA

William Calver, II

Altair Product Design, Troy, MI

Michael Tognarelli

BP America Production Company, Houston, TX

Yiannis Constantinides

Chevron, Houston, TX

Massimiliano Russo

Statoil, Houston, TX

Paper No. OMAE2016-54932, pp. V002T08A044; 6 pages
  • ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 2: CFD and VIV
  • Busan, South Korea, June 19–24, 2016
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4993-4
  • Copyright © 2016 by ASME


Blow-out preventers (BOPs) can be subjected to vortex induced vibration and also oscillating wave-induced loads from attached risers. Typically, the response of the BOP is estimated using heuristic codes and assumed hydrodynamic coefficients (added mass and drag) of the BOP and attached structures. In current practice, complex structures such as a BOP are tested in a tow basin using physical models to find these coefficients. An alternative, which is explored here, is to use computational fluid dynamics (CFD). Two BOP designs have been tested in 1:12 scale. We use CFD to simulate these experiments and to calculate forces on the models the resulting force histories. Added mass and drag coefficients are calculated from the CFD results at various Keulegan-Carpenter numbers and the results are compared with data derived from tow tank experiments. It is shown that the CFD simulations can provide an alternative to tow tank experiments over a wide range of experimental parameters. CFD simulations are also used to predict the hydrodynamic coefficients of a full scale structure and the results compared with the model scale results.

Copyright © 2016 by ASME



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