The Blockage Effects on Vehicle Aerodynamics in Closed-Wall Wind Tunnel – A CFD Study
نویسندگان
چکیده
An investigation into the total blockage effects on aerodynamic drag in closed-wall wind tunnel testing has been carried out by computational fluid dynamics (CFD). The simulation of flow past two different realistic, full-scale, heavy-duty truck models was conducted. The models were placed at different yawing angles in the virtual wind tunnels with blockage ratio of about 10%; which is exactly the same as the DNW experimental wind tunnel geometry. To compare the results with ideal (blockage free condition) case, other simulations with larger cross section at the blockage ratio of 1.1% were also conducted. Comparisons of the ideal CFD results to the corrected Cd values obtained by some existing blockage correction methods for closed-wall wind tunnel are also examined.
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