Setting Up Eulerian Impingement

To model droplet impingement from a Eulerian phase in a Eulerian Multiphase simulation, you set up a Film-Eulerian phase interaction or a Film-Physics Continuum phase interaction. You then activate the Incident Mass Flux Impingement model or the Caraghiaur Impingement model and specify the appropriate properties.

Pre-requisites:

  • A Eulerian Multiphase (EMP) simulation with the Fluid Film model activated.

  • The relevant Eulerian phases and fluid film phases defined.

    Both single-component phases and multi-component phases are supported.

To model mass transfer due to inertial impingement on a surface:

  1. Set up a Film-Eulerian Phase Interaction.
  2. In the Phase Interaction Model Selection dialog, activate the Incident Mass Flux Impingement model or the Caraghiaur Impingement model.
    See Impingement Model Reference.
Set the appropriate model properties:
  1. If you are using the Incident Mass Flux Impingement model, specify the impingement efficiency of the liquid phase at the fluid-film interface.
    1. Select the Boundaries > [fluid-film interface] > Phase Conditions > [eulerian phase] > Physics Values > Impingement Efficiency node.


    2. In the Impingement Efficiency Properties window, set the appropriate Method and Value.

      The default impingement efficiency is a constant value of 1.0, meaning all of the impinging liquid phase is added to the fluid film. However, if you have some understanding of the impingement efficiency in your specific case, you can use a field function to provide an appropriate expression. For example, you can use this setting to model different impingement conditions without changing the physics setup.

  2. If you are using the Caraghiaur Impingement model, specify the proportion of droplets that hit the wall and the method that is used to evaluate the Lagrangian integral time scale of the fluid following the path of an inertial drop.
    1. Select the Multiphase Interaction > Phase Interactions > [Phase Interaction] > Models > Caraghiaur Impingement node, and specify Phi, the fraction of droplets that are moving towards the wall.
    2. Select the Lagrangian Integral Time Scale node and specify the method for calculating the Lagrangian integral time scale of the fluid following the path of an inertial drop.

      The options are Field Function and Zaichik.



  3. If you are using a multi-component fluid film and a multi-component droplet, select the Component Mapping node and map the components of the two phases.