Wind and Structures

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Impinging jet simulation of stationary downburst flow over topography

  • Mason, M.S. (School of Civil Engineering, University of Sydney) ;
  • Wood, G.S. (Cermak Peterka Petersen, Pty. Ltd.) ;
  • Fletcher, D.F. (School of Chemical and Biomolecular Engineering, University of Sydney)
  • Received : 2007.05.15
  • Accepted : 2007.09.03
  • Published : 2007.10.25
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Abstract

A non-translating, long duration thunderstorm downburst has been simulated experimentally and numerically by modelling a spatially stationary steady flow impinging air jet. Velocity profiles were shown to compare well with an upper-bound of velocity measurements reported for full-scale microbursts. Velocity speed-up over a range of topographic features in simulated downburst flow was also tested with comparisons made to previous work in a similar flow, and also boundary layer wind tunnel experiments. It was found that the amplification measured above the crest of topographic features in simulated downburst flow was up to 35% less than that observed in boundary layer flow for all shapes tested. From the computational standpoint we conclude that the Shear Stress Transport (SST) model performs the best from amongst a range of eddy-viscosity and second moment closures tested for modelling the impinging jet flow.

Keywords

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