The following limitations exist for the Eulerian Wall Film model:
The Eulerian Wall Film model is available for 3D geometries only.
Many models (for example, VOF multiphase flow or radiation) will not interact correctly with the film model without first modifying the boundary conditions using UDFs.
Wall-film behavior at junctions with baffles (zero-thickness walls) may lead to unphysical results due to the local mesh topology (wall, wall-shadow) and should be used with care, that is, isolated film walls must not share a common edge.
The wall film can only be single-component, but not multi-component.
The Eulerian Wall Film model is not compatible with the following models and features:
Non-conformal interfaces
Overset meshes
Mesh operations (such as fuse, zone extrusion, zone type change, zone activation, and others)
Note that cell/face separation and cell/face merge are compatible with the EWF model. See Overview of Using the Eulerian Wall Film Model for details.
Moving and deforming meshes
Note that moving or rotating boundaries are compatible with the EWF model.
Lagrangian Wall Film (LWF) model
When EWF is enabled in the Eulerian Wall Film dialog box, then the wall-film option will not appear in the Discrete Phase BC Type drop-down list in the Wall dialog box (DPM tab).