An Automobile is a combination of several industrial technologies in a miniaturised form. CFD can be applied in different areas and would then have to be approached as per the characteristics of those physics.
The fundamental concepts of the Aerodynamics of an automobile can be found in several excellent books.
A few are listed here :
1. Aerodynamics of Road Vehicles -Hucho
2. Aerodynamics of Race Cars - J.Katz
CFD can be applied in situations pertaining to the external car aerodynamics, climate control, engine cooling, combustion in engines, exhaust flow and design
FEM or FDM technique can be used to find out the response of a temperature sensor mounted on exhaust gas manifold.
FEM techniques are widely used to check whether a sensor mounted would withstand the engine vibration and its life
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