Numerical study of the Reynolds-number dependence of two-dimensional scour beneath offshore pipelines in steady currents

D.F. Liang, Liang Cheng, K. Yeow

    Research output: Contribution to journalArticlepeer-review

    29 Citations (Scopus)

    Abstract

    A numerical model for local scour below pipelines is employed to investigate the Reynolds-number dependence of the two-dimensional scour beneath offshore pipelines in steady currents. A novel wall function is proposed in calculating the suspended sediment transport rate in the model. Scour developments beneath a model pipeline and the corresponding prototype pipeline are simulated under the same undisturbed Shields parameter but different values of Reynolds number. The effects of the Reynolds number difference on the scour profile development are investigated. It is found that scour depths for prototype pipelines are about 10-15%, smaller than those for model pipelines. The flow phenomena that causes this difference are discussed by means of flow visualization. The normalized time scales are found to be approximately the same. The simulated scour profiles for the model pipelines agree well with the experimental results from an independent study. (c) 2005 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)1590-1607
    JournalOcean Engineering
    Volume32
    Issue number13
    DOIs
    Publication statusPublished - 2005

    Fingerprint

    Dive into the research topics of 'Numerical study of the Reynolds-number dependence of two-dimensional scour beneath offshore pipelines in steady currents'. Together they form a unique fingerprint.

    Cite this