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Wind and Structures Volume 10, Number 5, September 2007 , pages 437-462 DOI: https://doi.org/10.12989/was.2007.10.5.437 |
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Impinging jet simulation of stationary downburst flow over topography |
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M.S. Mason, G.S. Wood and D.F. Fletcher
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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. | ||
| Key Words | ||
| downburst; speed-up; topography; impinging jet. | ||
| Address | ||
| M.S. Mason; School of Civil Engineering, University of Sydney, Sydney, NSW 2006, Australia G.S. Wood; Cermak Peterka Petersen, Pty. Ltd., St. Peters, NSW 2044, Australia D.F. Fletcher; School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, NSW 2006, Australia | ||