Large Eddy Simulation of the Flow-Field around a Full-Scale Heavy-Duty Truck

Prasanjit Das, Makoto Tsubokura, Tomofuyu Matsuuki, Nobuyuki Oshima, Kozo Kitoh
2013 Procedia Engineering  
In this paper, Large Eddy Simulations (LES) of flow field around two different full-scale heavy-duty truck with air deflector and without an air deflector model are presented. The full-scale truck model is considered which contains a number of details such as bumpers, underbody, tractor chassis, wheels and axles. The numerical simulations have been conducted with two virtual wind tunnels at different yaw angle at 0°, 5° and 10°. The models are placed at different yawing angles in the virtual
more » ... d tunnels with a blockage ratio of about 10%, which is same as the experimental wind tunnel. To compare the corrected experimental results with the ideal case, other simulations are also conducted with a larger cross section at the blockage ratio of about 1%. A detailed survey of both instantaneous and timeaveraged flow is presented. The steady state simulations with tetrahedral meshes predict the drag coefficient ( d C ) accurately within 3.3%, 4.5% and 3.3% of with air deflector model and 1.3%, 4.1% and 7% of without an air deflector model to corresponding experimental values at 0 o , 5 o and 10 o yaw cases, respectively. It is observed that aerodynamic coefficients such as drag coefficient ( d C ), side force coefficient ( s C ) and lift force coefficient ( l C ) depend on yaw angles and as well as vehicle geometry.
doi:10.1016/j.proeng.2013.03.155 fatcat:noolkg4uczbdhnulvn42vljcsi