[dan86]

I'm having divergence issues with eulerian wall film model. I'm using a solid cone injection of water into air (DPM model), spraying a flat plate (30 mm thick) positioned normal to the axis of the spray. The spray axis horizontal and flat plate vertical, gravity enabled to act on the liquid film in z (downward direction).

The injection is water set at 353 K, while the continuous phase is initialised at 303 K. The point of the simulation is to get an idea of the heating of the plate due to the impinging spray/liquid film.

I'm running as transient solver, with a very small time step 1e-04 s, which gives convergence in around 25 iterations / time step.

Everything is fine up until the liquid film just begins to build up. At first the temperature of the film is equal to the temperature of the incoming droplets (as expected) but maybe 10 time steps later the temperature of the liquid film suddenly increases by around 80K to way above the spray temperature and the solution eventually diverges.

If anyone has any experience with this model or any suggestions, it would be much appreciated. Thank you.