engineers led by researcher Greg Gatlin have sprayed fluorescent oil on a 5.8 percent scale model of a futuristic hybrid wing body during tests in the14 by-22-Foot Subsonic Wind Tunnel.
The oil helps researchers "see" the flow patterns when air passes over and around the model.
https://www.nasa.gov/sites/default/files/hwb_oil_visualization_larc_2013.jpg
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