2021 MRV Challenge: Seoul National University Results

This work is a contribution to the 2021 Magnetic Resonance Velocimetry (MRV) Challenge, and describes the results of Seoul National University. Experiments were conducted on a square cross-section water channel, which had an array of rectangular blocks that represent buildings, and an injection hole in the floor behind the first building. It should be noted that this apparatus was transferred between multiple research groups worldwide to provide a common platform to compare results. The Reynolds number of the main channel flow is 15,000, and a pulsatile jet is ejected into the main flow, producing a highly transient 3D flow structure. Phase-locked 3D velocity measurements were acquired by a 3T Siemens MRI scanner, and reconstructed using 22 phases across the jet injection cycle. Detailed results of the complex 3D flow interaction between the transient jet, main flow, and buildings are presented throughout the injection cycle at various locations. Implications in regards to mixing with transient jet plumes will be discussed.