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Mark V. Morkovin Wind Tunnel  The Mark V. Morkovin closed-return wind tunnel is of the closed-return type and is capable of running at speeds up to 35 m/s while maintaining turbulence-intensity levels below 0.1 % in the high-speed test section. A 4:1 contraction leads to the 0.91 m-high x 0.61 m-wide x 6 m-long test section. Over the past fifteen years, the high-speed test section has been dedicated to turbulent boundary layer research. The test boundary layer develops along a mirror-finish aluminum flat plate which is placed 0.3 m above the test section floor, leaving a 0.61 m x 0.61 m flow area on top of the plate. Transition to turbulence is triggered using a flush-mounted 24-grit 0.2-m long sandpaper strip, located about 0.15 m downstream of the leading edge of the flat plate. The streamwise pressure gradient in the test section can be controlled by adjusting the movable test-section ceiling to accommodate the growth of boundary layers. The low-speed test section of the wind tunnel is designed to allow for simulation of atmospheric boundary layer. This allows environmental type of research; e.g., wind effects on sky scrapers and buildings, to be investigated using scaled-down models of the structures of interest.
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