View photosMoreMechanical engineers Abdullah Mojeb Aldar L , 26, and Fahad al-Musalam, 24, move a 3d-printed model of QatarÕs Al Bayt stadium, which will host a World Cup semi-final in 2022, at a laboratory at Qatar University in Doha, Qatar June 16, 2016.
Qatar has sought to allay concerns about its summer heat and moved the competition to the cooler month of November.
But Qatar still experiences sand and dust storms in winter months.
"We're looking at aerodynamics, how changing the shape of the stadium affects the dust, heat and wind inside," Ghani said.
Like an open-top car, you want air flying over not swirling inside," he said, pointing to smoke billowing around a cavernous black stadium inside the wind tunnel.
3D printing has been used by engineers to build prototypes for decades but has recently become more widespread, with uses including the production of dental crowns and light aircraft parts.