[wetru]

Hello

I am trying to simulate the condensation on a headlamp. condensation occurs on inner surface of the lens. I try to use Eulerian Wall Film Model. this model is working good without bulbs ON. But when I gave energy to the bulb which means high radiation, results become unreal. since outer air temp is 23°C, and the bulb gives radiation energy to the lens, I had app. (minus) -250 °C on lens surface which is not realistic. By the way I am using DO radiation model.

In help menu there is an explanation as below.

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28.1. Limitations
The following limitations exist for the Eulerian Wall Film model:

• Available for 3-D geometries only
• Compatible with stationary walls only

Many models (e.g., VOF multiphase flow or radiation) will not interact correctly with the film model without first modifying the boundary conditions using UDFs.

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I wanted help from ANSYS support, but do not receive any feedback yet.

So I would like to ask you if anybody knows such kind of problem, and which kind of UDF needed for solution?