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The goal of the present work is to simulate through a commercial CFD code the flow within the headlamp, including the condensation process in the lens of the headlamp. Considering the results, it has been possible to obtain a better comprehension of the condensation process, temperature profile and moist air flow inside the headlamp. Looking for the upgrade in headlamps designs, a mathematical model able to represent the water fogging and defogging conditions on the lens of automotive headlamp was develop. The proposed model represents evaporation and condensation of water film on specified walls. Relative humidity profile within the headlamp has also been analyzed, evaluating the regions where the moisture is closer of the saturation condition. The obtained results in simulation have been in concordance with expected ones, showing the same condensation regions observed in the experimental tests performed by the automaker.

In last years environmental complains and instable petroleum prices have brought up a necessity to develop more efficient vehicles, witch shows less fuel consumption. With this aim better projected engines are being put into market utilizing renewable fuels like brazilian ethanol. Another fundamental way to improve efficiency is minimizing the resistance furnished by the vehicle to air flowing through during a translation. This resistance reduction known as Drag is one of the main objectives of Vehicle Aerodynamic science. A low drag vehicle might be considered as more susceptible to air flow instabilities, as wind gusts, resulting in unsafe situations to its occupants therefore this material intends to demonstrate the vehicle drag and aerodynamic stability are distinct concepts and it is possible have a drag efficient car without losing drivability. The use of Basic Models geometry to demonstrate aerodynamic concept is a feature defunded in automotive industry.