【毕设用---外文翻译来源】ANSYS英文论文 (48).pdf

Numerical Simulation of Automobile Windshield
Defogging

Mark Doroudian
Mindware Engineering
Abstract
Visibility in the automotive industry is a major source of concern for the car manufacturers and safety
design engineers. Water film (fog) that forms on the windshield during winter times would reduce and
disturb the driver’s visibility. This water film is originating from condensing water vapor on the inside
surface of the windshield due to low outside temperatures. Primary source of this vapor is the passenger’s
breath, which condenses on the windshield.
Warm and dry air, which impinges at certain velocity and angle relative to the windshield, will reduce the
thickness of this water film (defogging) and hence improves driver’s visibility. Therefore, a well-designed
HVAC system will help reduce this water film thickness to an accepted level for visibility.
CFD technology can be utilized to study the defogging process by tracking water vapor content and predict
transient variation of condensed water layer on the glass surface.
An analytical approach to simulate the defogging process including removal of the water vapor from the
passenger cabin glass is discussed. The pre-processing including grid generation was performed using
ICEMCFD. The transient thermal CFD simulation was performed using Fluent.
Introduction
Visibility in the automo