Owkes, MarkBenson, MichaelElkins, ChristopherWilde, NicholasVan Poppel, Bret2021-03-242021-03-242020-07Owkes, Mark, Michael Benson, Christopher Elkins, Nicholas Wilde, and Bret Van Poppel. “Three-Dimensional Velocity and Concentration Measurements and Simulations of a Scaled Jack Rabbit II Mock Urban Array.” Atmospheric Environment 233 (July 2020): 117520. doi:10.1016/j.atmosenv.2020.117520.1352-2310https://scholarworks.montana.edu/handle/1/16164Magnetic resonance (MR) techniques provide non-invasive, three-dimensional measurements of velocity and concentration fields. Applying MR techniques to measure flows of contaminants through urban arrays provides a wealth of information that is difficult to obtain with large-scale field tests. In this project, a 1:188 scaled model of the phase 1 Jack Rabbit II field test was replicated and studied using a water tunnel with properties chosen to mimic field conditions. Three-dimensional, time-averaged flow data was measured using magnetic resonance velocimetry (MRV) and magnetic resonance concentration (MRC) techniques. The scaled flow was also modeled with large-eddy simulations (LES) to provide a dataset for comparison with the MR based measurements. Despite a complex, three-dimensional flow field, both velocity and concentration show good agreement between the experimental measurements and simulation data. Measurement uncertainty was estimated to be of each of the measured velocity components at each location for MRV and of the measured concentration at each location for MRC.en-US© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 licensehttp://creativecommons.org/licenses/by-nc-nd/4.0/Article