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Hydrodynamic Forces on a Pipeline With Uneven Embedment

[+] Author Affiliations
Hongwei An, Liang Cheng

University of Western Australia, Crawley, WA, Australia

Ming Zhao

University of Western Sydney, Penrith, NSW, Australia

Paper No. OMAE2012-84054, pp. 855-863; 9 pages
doi:10.1115/OMAE2012-84054
From:
  • ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Pipeline and Riser Technology
  • Rio de Janeiro, Brazil, July 1–6, 2012
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4490-8
  • Copyright © 2012 by ASME

abstract

Hydrodynamic forces on a pipeline with uneven embedment on either side, subject to oscillatory flow, are investigated numerically. Two-dimensional Reynolds-Averaged Navier-Stokes equations with a k-ω turbulent model are solved to simulate the flow in the fluid. It is assumed the seepage flow in the seabed is governed by Darcy’s law and Laplace equation is solved to calculate the pore pressure under the assumption of isotropic and homogenous seabed. The effects of embedment depths and KC numbers on the hydrodynamic force are investigated. The flow structure and pressure distribution around the pipeline are discussed. The inline force and lift exerting on the pipeline are presented in the form of peak values and Fourier coefficients. It is found that flow structures around the pipeline are asymmetric due to the difference of seabed levels on the two sides of the pipeline. The degree of asymmetry increases with the increase of |e1-e2|/D. Obvious difference exists between the hydrodynamic forces experienced by the pipeline in two succeeding halves of a period due to the asymmetric flow structure around the pipeline. The peak values of inline force and lift reduce as e2/D increase for all values of e1 examined in this study. The maximum error of the inline force and lift predicted by using sixth order Fourier series is about 4%.

Copyright © 2012 by ASME

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