In #144 , @vidanovic @simon-wacker and @christoph-maurer have implemented the option to define a constant forced convection in a gap. This serves well for exhaust air removal between a glazing and an interior roller blind which is not permeable for air.
As discussed with @dccurcija and @vidanovic , Fraunhofer ISE wants to develop a model for exhaust air removal between a glazing and an air-permeable interior roller blind. A thermal-pneumatic network needs to be developed to determine the air flow through the blind and the vertical distribution of the temperatures in the gap and the blind. For this network, we probably need a very good solver. Therefore, the Ceres solver is planned to be integrated in #171 .