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Vortex-Induced Vibrations of a Riser With Design Variations

[+] Author Affiliations
Robert F. Zueck

US Navy - NAVFAC EXWC, Port Hueneme, CA

Paper No. OMAE2016-54990, pp. V002T08A046; 10 pages
doi:10.1115/OMAE2016-54990
From:
  • 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

abstract

As meta-stable motions transverse to fluid flow in slender bluff-bodied structures, Vortex-Induced Vibrations (VIV) are mostly determined by three-dimensional (3D) geometric and relativistic changes that evolve in the structure. Simplistic models of the structure ignore these key physical principles.

In a 2014 OMAE paper, we introduced the key physical concepts for simulating VIV in a horizontal-oriented slender structure (pipeline). In a 2015 OMAE paper, we re-oriented the same structure vertically to simulate VIV in a vertical riser.

In this paper, one or more of the following variations in the vertically-oriented riser will be made, in order to judge the physical effect each variation has on the character and distribution of VIV along the riser:

• Cyclically move the upper end of the vertical riser

• Change into an S-shaped riser by adding weight/buoyancy

• Disconnect the lower end of the S-shaped riser

The simulations help show and reinforce the following mechanical concepts of VIV

• How gravity and fluid drag evolves a 3D shape in the riser

• How this shape creates specific structural flexibilities

• How these flexibilities set the stage for specific VIV

• How tension and end conditions are vital to VIV behavior

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