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Experimental Simulation Of A Density-Driven Downburst Translating Within A Turbulent Boundary Layer, Shivani Ashitkumar Jariwala
Experimental Simulation Of A Density-Driven Downburst Translating Within A Turbulent Boundary Layer, Shivani Ashitkumar Jariwala
Electronic Thesis and Dissertation Repository
Downburst outflows emerging from thunderstorm producing clouds are contained within the atmosphere where the outflow interacts with the preexisting atmospheric boundary layer (ABL). This novel study employs a realistic approach for experimental simulation of downbursts by translating the downburst source within a scaled ABL within a hydraulic flume system that produces open channel flow. The density-driven model approach is used, involving an iris operated cylinder release mechanism translating inside the ABL generated over a restrictive fetch using passive turbulence generating devices at model scales of 1:5500 and 1:10,000. The velocity vector fields across a vertical plane revealed asymmetrical outflows generated …
Experimental Simulation Of Density-Driven Thunderstorm Downbursts, Roghayyeh Babaei Koli
Experimental Simulation Of Density-Driven Thunderstorm Downbursts, Roghayyeh Babaei Koli
Electronic Thesis and Dissertation Repository
Evaporative cooling of the precipitation within the thunderstorm cloud results in the formation of a mass of cold and dense air which moves toward the ground and after impingement turns into strong radial winds near the surface. In this study, an experimental approach was taken to investigate the downbursts. The two-fluid model was used, and the various features of the experimental setup of previous researchers were modified to incorporate the specifications of natural downbursts. First, two new release cylinders were manufactured and their capabilities in producing repeatable and symmetric outflows were examined. Then, the effects of cylinder wall design, density …