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An aerodynamic analysis methodology which makes efficient use of ANSA and FLUENT software's in the aerodynamic design of tractor-trailer class heavy commercial road vehicles is presented. The aerodynamic drag coefficient of the truck is used as the main control parameter to evaluate the performance of the methodology. Analysis methodology development activities include determining optimal FLUENT software analysis parameters for the defined problem (RANS based turbulence models, wall boundary layer models, solution schemes) and the necessary ANSA mesh generation parameters (boundary layer number and growth rate, wall surface mesh resolution, total mesh resolution). Proposed methodology is first constructed based on CFD simulations for the zero-degree yaw angle case of the 1/8 sized GCM geometry. The present results are within 1% of the experimental data.

The purpose of this study is to present the effects of several design actions on engine cooling performance of a heavy duty construction truck, with the aid of numerical and experimental investigations. The design actions involve the modifications of the front end geometry and implementation of different heat exchangers and fans. The sensitivity of engine cooling performance related to the concerned design changes is monitored with the variation in the engine coolant temperature. Numerical investigations are carried out with the Reynolds averaged Navier Stokes Equations based CFD solver, UH3D, and the results are validated with the experiments conducted at Behr wind tunnel facilities in Stuttgart. It is seen that the experimental results show good correlation with the CFD simulations.