14.11. Controlling Film Movement with Lagrangian Wall Film Model

You can control the movement of the Lagrangian wall film particles using the define/models/dpm/options/film-movement text command.

When film condensation is enabled on a wall (wall-film is selected as Discrete Phase BC Type in the Wall dialog box (DPM tab)), the film particles formed by condensation are, by default, stagnant. To enable the movement of the condensing film particles, answer no to the first prompt:

define/models/dpm/options/film-movement
Disable movement of condensing film particles? [yes] no

Further more, you can disable the acceleration of all film particles by answering yes to the next prompt:

Disable acceleration of all film particles? [no] yes

When modeling the movement of the condensing film particles, note the following:

The convective wall-film heat transfer model (described in Convective Heat Transfer Model in the Fluent Theory Guide) is not compatible with the condensing particle movement.
Depending on the specific application, interpolation of wall film properties can cause large fluctuations of film particles velocity. This can be resolved by disabling the interpolation option of the wall film properties by issuing the following text command:
```
define/models/dpm/numerics/high-resolution-tracking/barycentric-interpolation/
interpolate-wallfilm-properties?
Activate interpolation of wallfilm properties? [yes] no
```