Windshield visibility for passenger buses is a crucial matter since it is
directly related to the safety of the drivers. The fog that forms on the
windshield restricts the driver’s visibility and adversely affects driving
safety. Due to these concerns, there should be an effective demisting system in
every passenger bus. In this study, the performance of the windshield demisting
system was investigated in a passenger bus developed by Anadolu Isuzu. The
demisting system in the vehicle was examined by performing CFD (computational
fluid dynamics) analysis with the software Ansys FLUENT R20 version. Tests were
performed on the vehicle with the existing system in order to measure air
velocity values and temperatures on the nozzles. Fan boundary conditions in the
CFD simulations are applied to entrance of blower, which is a radial fan placed
in defroster unit to supply air to windshield. With this method, the flow rate
values of the blower and the nozzle outlet velocity values are obtained as
outputs of the analysis without modeling the blower in all cases. This method
can decrease much more time consumption in these simulations and is used to
improve system design with validation of vehicle test and CFD results. In
addition, realizable k-ε, SST k-ω with PRESTO in pressure scheme, and SST k-ω
turbulence models were compared in the calculations and SST k-ω was found to be
the most consistent one.
© ANADOLU ISUZU Otomotiv Sanayi A.Ş.; Published by SAE International. This Open
Access article is published under the terms of the Creative Commons Attribution
Non-Commercial, No Derivatives License
(http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits use,
distribution, and reproduction in any medium, provided that the use is
non-commercial, that no modifications or adaptations are made, and that the
original author(s) and the source are credited.