CFD Methodology to Correlate the Defrost Flow and Passenger Car's Windshield Defogging 2010-36-0335
The vehicle windshield defogging performance has direct
influence under driver safety. In extreme situations, when the
vehicle is not equipped with air conditioner and loaded with
maximum occupancy, the defroster system must correctly direct the
flow in order to defog pre-defined regions on the windshield. This
process can't take too long and must guarantee a minimum
fog-free area to increase driver's visibility.
The main objective of this paper is to demonstrate the defogging
simulation methodology developed by FIAT Brazil and Multicorpos
Engineering. It uses CFD simulations with StarCCM+ software.
Experimental data obtained from climatic chamber is used to compare
the numerical data and validate the methodology.
The simulations were able to conclude that defogging performance
is correlated to flow homogeneity and its mean velocity on the
internal windshield area. CFD simulations were used to indicate fin
angles that can enhance the fog layer removal.