Aerodynamic analysis of GTD model administrative service vehicle

In this study, experimental study and three dimensional simulation are performed to determine drag force and drag coefficient of the pickup vehicle. Experimental study is carried out with ¼ scale model vehicle in two different steps in Ankara Wind Tunnel. In the first step pressures measured and in the second step drag force measurements had been done for five different velocities. Simulation is performed in test velocities with same vehicle and with a similar wind tunnel to Ankara Wind Tunnel. Governing equations are solved numerically using Fluent CFD solver. Turbulent effect has been calculated using k-?(standard, realizable,RNG) and Reynolds stess model with near wall treatment (standard wall function, non-equilibrium wall fuction, enhanced wall treatment) and k-? (standard, SST) turbulent models. Experiments and simulation results show that maximum pressure occurs in front of vehicle, minimum pressure occurs in the intersection of windscreen and the roof. Drag coefficient of model vehicle has been calculated. Key Words : Aerodynamic analyses, turbulence, drag coefficient,