Influence of tilt and surface roughness on the outflow wind field of an impinging jet

M. S. Mason, G. S. Wood, D. F. Fletcher

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)


    A physical and numerical steady flow impinging jet has been used to simulate the bulk characteristics of a downburst-like wind field. The influence of downdraft tilt and surface roughness on the ensuing wall jet flow has been investigated. It was found that a simulated downdraft impinging the surface at a non-normal angle has the potential for causing larger structural loads than the normal impingement case. It was also found that for the current impinging jet simulations, surface roughness played a minor role in determining the storm maximum wind structure, but this influence increased as the wall jet diverged. However, through comparison with previous research it was found that the influence of surface roughness is Reynolds number dependent and therefore may differ from that reported herein for full-scale downburst cases. Using the current experimental results an empirical model has been developed for laboratory-scale impinging jet velocity structure that includes the influence of both jet tilt and surface roughness.

    Original languageEnglish
    Pages (from-to)179-204
    Number of pages26
    JournalWind and Structures, An International Journal
    Issue number3
    Publication statusPublished - May 2009


    • Downburst
    • Empirical model
    • Impinging jet
    • Microburst
    • Surface roughness
    • Tilted jet


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