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Circumferential analysis of a simulated three-dimensional downburst-producing thunderstorm outflow
https://orcid.org/0000-0001-5787-3329
Abstract A high-resolution simulation of a downburst-producing thunderstorm has been conducted using a three-dimensional cloud model. The highly asymmetric near-ground outflow within the downburst has been analyzed within an axi-symmetric framework, by undertaking circumferential spatial averaging of the wind speed components, in order to explore whether the salient features of the outflow can be represented using the simpler models employed in wind engineering. The results indicate that this approach yields, at a given time during the event, outflow profiles that preserve the regions of the highest wind speed but do not preserve any flow structure. It is suggested that the peak radial wind speed around any circumference may be computed from the spatially-averaged mean multiplied by a consistent peak factor.
Highlights Real downbursts are not axi-symmetric, unlike simple engineering downburst models. Circumferential averaging of downburst data preserves regions of highest wind speed. Circumferential averaging does not preserve the dominant outflow vortex structure. The spatial averaging produces a mean outflow wind speed at each position and time. A peak radial speed may then be formed from the mean multiplied by a peak factor.
Circumferential analysis of a simulated three-dimensional downburst-producing thunderstorm outflow
https://orcid.org/0000-0001-5787-3329
Abstract A high-resolution simulation of a downburst-producing thunderstorm has been conducted using a three-dimensional cloud model. The highly asymmetric near-ground outflow within the downburst has been analyzed within an axi-symmetric framework, by undertaking circumferential spatial averaging of the wind speed components, in order to explore whether the salient features of the outflow can be represented using the simpler models employed in wind engineering. The results indicate that this approach yields, at a given time during the event, outflow profiles that preserve the regions of the highest wind speed but do not preserve any flow structure. It is suggested that the peak radial wind speed around any circumference may be computed from the spatially-averaged mean multiplied by a consistent peak factor.
Highlights Real downbursts are not axi-symmetric, unlike simple engineering downburst models. Circumferential averaging of downburst data preserves regions of highest wind speed. Circumferential averaging does not preserve the dominant outflow vortex structure. The spatial averaging produces a mean outflow wind speed at each position and time. A peak radial speed may then be formed from the mean multiplied by a peak factor.
Circumferential analysis of a simulated three-dimensional downburst-producing thunderstorm outflow
https://orcid.org/0000-0001-5787-3329
Abstract A high-resolution simulation of a downburst-producing thunderstorm has been conducted using a three-dimensional cloud model. The highly asymmetric near-ground outflow within the downburst has been analyzed within an axi-symmetric framework, by undertaking circumferential spatial averaging of the wind speed components, in order to explore whether the salient features of the outflow can be represented using the simpler models employed in wind engineering. The results indicate that this approach yields, at a given time during the event, outflow profiles that preserve the regions of the highest wind speed but do not preserve any flow structure. It is suggested that the peak radial wind speed around any circumference may be computed from the spatially-averaged mean multiplied by a consistent peak factor.
Highlights Real downbursts are not axi-symmetric, unlike simple engineering downburst models. Circumferential averaging of downburst data preserves regions of highest wind speed. Circumferential averaging does not preserve the dominant outflow vortex structure. The spatial averaging produces a mean outflow wind speed at each position and time. A peak radial speed may then be formed from the mean multiplied by a peak factor.
Circumferential analysis of a simulated three-dimensional downburst-producing thunderstorm outflow
Orf, Leigh G. (author) / Oreskovic, Chris (author) / Savory, Eric (author) / Kantor, Erica (author)
Journal of Wind Engineering and Industrial Aerodynamics ; 135 ; 182-190
2014-01-01
9 pages
Article (Journal)
Electronic Resource
English
Circumferential analysis of a simulated three-dimensional downburst-producing thunderstorm outflow
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