2019 MRV Challenge: Results and Comparisons

This presentation is part of the 2019 Magnetic Resonance Velocimetry (MRV) Challenge and represents the combined results from all the participants of the challenge.~ Four research groups have made measurements in the same apparatus comprising a square cross section U-bend with a tight radius that will cause turbulent flow separation.~ An inlet boundary layer trip marks the common coordinate origin of the flow in the channel.~ The apparatus that was transferred between the research labs includes detailed flow conditioning to ensure that variations in supply and exit plumbing will not disrupt the test section flow.~ The test was conducted at a Reynolds Number of 15,000 based on the channel hydraulic diameter, and a tight radius U-Bend ensures a strongly three-dimensional flow field.~ This presentation will focus on the results from each team, which will be compared in the region near the boundary layer trip, at the entrance to and through the U-Bend, and through the exit passageway using velocity field contour plots, iso-surfaces, and quantities derived from the mean velocity components.~ Similarities and differences will be presented which can provide insight into the opportunities that state of the art MRV provides to researchers.