The cover lens of vehicle headlights is usually the coldest component when the light is switched off, so that moisture condensation (dew formation) quickly occurs on the inside of the lens. The targeted arrangement of ventilation openings in the headlamp housing creates a flow field that must be used to efficiently remove the moisture from the headlamp.
In the example shown here, a film of water was assumed to form on the pane, which is only removed by ventilating the headlight with dry air. With this procedure, different ventilation options for a headlamp can be examined and optimized for their effectiveness on the virtual model.