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Considering the increment of computational power and the accuracy on the results, virtual engineering tools are becoming more popular among the industries, especially inside the automotive, seeking development time and cost reduction. Taking advantage of the modern resources, it was developed a simulation methodology in order to verify the water flow behavior from the roof to the side ditch of the vehicle's roof. Within this methodology it is possible to virtually test a vehicle without a real prototype, analyze the roof performance and suggest design changes without any prototype part being made, which implies in cost and development time reduction.