Jet flow over foredunes

Patrick Hesp, Thomas Smyth

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)


    Jet flows, which are localized flows exhibiting a high speed maxima, are relatively common in nature, and in many devices. They have only been occasionally observed on dunes, and their dynamics are poorly known. This paper examines computational fluid dynamic (CFD) two-dimensional (2D) modelling of jet flow over a foredune topography. Flow was simulated in 10° increments from onshore (0°) to highly oblique alongshore (70°) incident wind approach angles. CFD modelling reveals that the formation of a jet is not dependent on a critical wind speed, and an increase in incident wind velocity does not affect the magnitude of jet flow. A jet is first formed at ~1.0 m seawards of the foredune crest on the Prince Edward Island foredune morphology example examined here. A jet is not developed when the incident wind is from an oblique approach angle greater than ~50° because there is significantly less flow acceleration across a much lower slope at this incident angle. The presence of a scarp does influence the structure of the crest jet, in that the jet is more pronounced where a scarp is present. Surface roughness affects the magnitude of jet expansion and jets are better developed on bare surfaces compared to vegetated ones.

    Original languageEnglish
    Pages (from-to)1727-1735
    Number of pages9
    JournalEarth Surface Processes and Landforms
    Issue number12
    Publication statusPublished - 30 Sept 2016


    • computational fluid dynamics (CFD)
    • flow dynamics
    • foredune
    • jet
    • jet flow


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