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Flow Around a Pipeline Near a Smooth Bed in Steady Current

[+] Author Affiliations
Xikun Wang, Soon Keat Tan

Nanyang Technological University, Singapore

Zhiyong Hao

Shanghai Maritime University, Shanghai, China

Paper No. OMAE2010-20749, pp. 725-730; 6 pages
doi:10.1115/OMAE2010-20749
From:
  • ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering
  • 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B
  • Shanghai, China, June 6–11, 2010
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4913-2 | eISBN: 978-0-7918-3873-0
  • Copyright © 2010 by ASME

abstract

The flow around submarine pipelines is represented by a circular cylinder near a horizontal plane wall. The combined effects of Reynolds number (Re = 4000, 6400 and 9200) and gap ratio (S/D = 0.125–2, where S is the gap height between the cylinder bottom and the wall surface, and D is cylinder diameter) on the flow are investigated experimentally using Particle Image Velocimetry (PIV). Detailed velocity vector maps, contours of vorticity, root-mean-square (rms) velocities and Reynolds shear stress are provided. Results show that both the ensemble-averaged and the instantaneous flow fields are primarily dependent on S/D, yet the effects of Re are also obvious over the Re-range considered. Shear layers surrounding the recirculation region behind the cylinder are discussed in terms of the flow physics and vortex formation lengths of large-scale Karman vortices. It is found that the critical gap ratio is about 0.3, higher than which the wake flow is characterized by the alternate Karman-like vortex shedding from the two sides of the cylinder, whereas below which there is no mutual coupling between the two shear layers. Flow structures depending upon the gap ratio and Reynolds number are interpreted with quantitative representations.

Copyright © 2010 by ASME

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