Abstract
A contaminant release within a stadium is studied experimentally using MRI techniques. The stadium geometry includes several realistic features, such as tunnels and a large roof opening, that enable ventilation and affect internal flow. MRI techniques are well suited for resolving flows in challenging internal geometries, and the three-dimensional measurements provide detailed insight into the complex flow and scalar dispersion occurring in, through, and around the stadium. Three-component velocity measurements were obtained for 0 and 45 degree wind angles measured relative to the minor axis of the roof opening. In both orientations, openings on the sides of the stadium provide most of the inflow, while the large roof opening provides most of the outflow. The data also demonstrate differences between the flow fields in the two orientations. Pressure gradients in the 0 degree orientation cause flow to enter the stadium via openings on its leeward side, while flow exits the stadium through openings on that side in the 45 degree case. The velocity results suggest that the 45 degree orientation yields a higher level of ventilation overall. Concentration measurements were obtained for the 0 degree wind angle, and demonstrate that recirculation causes contaminant to collect in the windward side of the stadium. Contaminant primarily exits the stadium through the roof, forming an elevated downstream plume. High concentrations within the stadium relative to the wake suggest that contaminant residence times within the stadium are significant. Along with providing detailed insight into ventilation dynamics, the MRI datasets are expected to be advantageous for robust model evaluation efforts.
Original language | English |
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State | Published - 2022 |
Externally published | Yes |
Event | 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 - Osaka, Virtual, Japan Duration: Jul 19 2022 → Jul 22 2022 |
Conference
Conference | 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022 |
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Country/Territory | Japan |
City | Osaka, Virtual |
Period | 07/19/22 → 07/22/22 |