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On the Effects of a Non-Stationary Seabed on the Morison Hydrodynamic Force for Off-Shore Structures

[+] Author Affiliations
Vincent O. S. Olunloyo, Charles A. Osheku

University of Lagos, Lagos, Nigeria

Paper No. OMAE2005-67475, pp. 955-971; 17 pages
doi:10.1115/OMAE2005-67475
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4195-2 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

It is well known that hydrodynamic forces can have significant effect on the dynamic stability and performance of moving offshore structures that are deployed for the exploration and exploitation of seabed geo-resources. This paper presents an integral transform approach for investigating the effects of non-stationary behavior of the seabed on the Morison hydrodynamic force associated with vertically moving submerged and partially buried offshore structures located in the neighborhood of an exploration zone. For this, the fluid-structure-soil dynamic interaction boundary value problem is modeled as a one-degree-of-freedom system, and the geo-mechanical behavior of the seabed is idealized as a spring and visco-elastic damper. In particular, the corresponding fluid velocity potential and acceleration kernels in the Morison force empirical relation as modified by the seabed poro-mechanics are computed and their implications for the design of such offshore structures analyzed.

Copyright © 2005 by ASME

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