Abstract
Engine compartments of motor vehicles are analyzed in terms of aerodynamic drag and cooling airflow by means of a simplified geometry. The geometry is based on an Ahmed body with a blunt rear end, equipped with a porous media modeling heat exchangers and a realistic engine section. Analytical results, wind tunnel exp erimentations and numerical simulations are conducted on this simplified geometry to provide a better understanding of the flows around and inside engine compartments, to connect the flows in teraction to the drag value, and to establish a link between the aerodynamic drag and the flow rate through the heat exchangers. Configurations favorable to low drag values and hig h engine cooling are put in evidence. Nomenclature ( ) z y, x, = coordinate system subscripts: L
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