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With demands for enhanced environmental performance such as fuel economy, the tendency has been to reduce the amount of wind introduced to the engine room to reduce drag. Meanwhile, exhaust gas temperatures are increasing in order to reduce emissions concentrations. As a result, the temperature environments for parts inside the engine room and underfloor parts are becoming harsher, and accurately understanding the temperature environments of parts is crucial in determining Engine room component layout during vehicle development and applying effective thermal countermeasures. Computational fluid dynamics (CFD) are effective for understanding complex phenomena such as heat generation and cooling. However, this paper reports the development of a method for accurately calculating the vehicle temperature distribution through identification from test results.

This paper describes tool development with which makes it possible for vehicle stylists and aerodynamicists to easily use Computational Fluid Dynamics, i.e., CFD, and evaluate aerodynamic performance at the concept stage of car development. This tool automatically provides CFD results to the user by preparing the vehicle exterior geometries and car specifications. The vehicle exterior, floor, and tires are the essential geometry data. This tool automatically generates the floor and tires based on the vehicle specifications. It, thereafter, executes the following process: automatic mesh generation, solver settings, calculations and standard post-processing. The user is able to obtain results within two hours. The tool enables stylists and aerodynamicists to understand flow phenomena in a timely fashion.