Setting Up Film Stripping to a Lagrangian Phase

To model film stripping in a Lagrangian Multiphase simulation, you set up a Film-Lagrangian phase interaction, activate the Stripping model, and specify the film stripping injector.

Make sure that you have already defined:
  • An Implicit Unsteady, PISO Unsteady, or Steady simulation.
  • A Lagrangian Multiphase simulation with the Fluid Film model activated.
  • Lagrangian phases and Fluid Film phases.

When you set up Lagrangian stripping, you create a Lagrangian injector and (for impingement) specify two-way coupling.

To model film stripping in a Lagrangian Multiphase simulation:

  1. Activate the Two-Way Coupling model so that the Lagrangian droplets can exchange mass, momentum, and energy with the fluid film.
  2. Create a Film-Lagrangian Phase Interaction with the appropriate Lagrangian phase and Fluid Film phase.
  3. Set up the Film-Lagrangian Phase Interaction:
    1. In the Phase Interaction Model Selection dialog, activate the Stripping model.
    2. Select the Stripping node and set Stripping Option to activate either or both Wave Stripping and Edge Stripping.
      See Stripping Model Properties.
    3. If you are modeling a multi-component fluid film and a multi-component droplet, map the components between the two phases.
  4. Set the Wave Stripping and Edge Stripping property values according to your simulation.

A Film Stripping Injector is used to identify a film surface from which droplets leave the film and are injected into the bulk flow.

  1. Create a Lagrangian injector, and set the following properties:
    Property Value
    Type Film Stripping
    Inputs Specify the entities which are used to generate inject points. In this case, select the Fluid-Film Interface boundary on the original fluid region.
    Lagrangian Phase The appropriate Lagrangian phase.
  2. Set the injector Time Randomization condition and the injector Parcel Streams value.
Note

If a film stripping injector is not activated for the Lagrangian phase, the film stripping models are still active. In this scenario, a warning message similar to the following is displayed:

Warning: Stripping injector [Film Stripping Injector] is inactive as no Lagrangian Phase has been selected. The Film Stripping model for [Film] will strip into void.

The stripping on the fluid film side is calculated but the stripped mass is not transferred into the Lagrangian phase. This feature can be useful in cases where you expect the stripped mass to make a negligible contribution to the relevant transport processes.