Two-phase flow modeling of clear-water onset and jet scour under offshore pipelines

Mani Golparvar Fard, Abbas Yeganeh-Bakhtiary, Liang Cheng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A two-phase flow model is presented for simulating early stages of local scour due to steady current under offshore pipelines. Fluid phase is computed with solving Reynolds Averaged Navier-Stokes (RANS) equations in conjunction with a standard k- ε turbulence model for turbulence closure using Finite Volume Method in a Cartesian coordinate system. Seabed under pipeline is treated as an assembly of discrete sand grains, in which local scour is introduced as the motion of granular media under action of unsteady flow. Motion of every sand particle is traced with a numerical code based on Distinct Element Method (DEM), in which the frequent interparticle collision is described with spring and dashpot system. Laboratory measurements have been conducted to calibrate and verify model parameters. Numerical experiments evident that interparticle collisions of moving sand grains induce a predominant micro-mechanism on early stages of local scour around offshore pipelines and it is concluded that two-phase modeling, provides a precise simulation on sediment transport occurring in local scour under offshore pipelines.

Original languageEnglish (US)
Title of host publication31st IAHR Congress 2005
Subtitle of host publicationWater Engineering for the Future, Choices and Challenges
EditorsJun Byong-Ho, Il Lee Sang, Seo Il Won, Choi Gye-Woon
PublisherKorea Water Resources Association
Pages4069-4080
Number of pages12
ISBN (Electronic)8987898245, 9788987898247
StatePublished - 2005
Externally publishedYes
Event31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges - Seoul, Korea, Republic of
Duration: Sep 11 2005Sep 16 2005

Publication series

Name31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Conference

Conference31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges
CountryKorea, Republic of
CitySeoul
Period9/11/059/16/05

Keywords

  • DEM
  • K- turbulence model
  • Local scour
  • Two-phase flow model

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Environmental Science (miscellaneous)
  • Water Science and Technology

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