Visualizing the Multi-Regime Multiphase Flow

You visualize the flow of water undergoing different flow regimes by creating an animation. In preparation for the animation, you save the Lagrangian particle diameter, the volume fractions of air and water, and the fluid film thickness to a simulation history (.simh) file.

For your convenience, the scene Multi-Regime Flow is pre-defined with several displayers. You combine several displayers in that scene to visualize the different flow regimes. To follow the progress of the VOF air-water interface, you use an isosurface. The Lagrangian droplets are colored by particle diameter. The water film on the floor is visualized a contour plot.

To visualize the multi-regime multiphase flow:

  1. Create an isosurface to display the VOF air-water interface:
    1. Right-click the Derived Parts node and select New > Isosurface.
    2. In the Create Isosurface panel, select the following properties:
      Property Setting
      Input Parts Regions > Fountain
      Scalar Volume Fraction > Volume Fraction of Water
      Isovalue 0.05
    3. Select No Displayer.
    4. Click Create, then Close.
  2. To define the solution history file:
    1. Right-click the Solution Histories node and select New.
    2. In the Save dialog, specify fountain as File Name, then click Save.
    3. Select the Solution Histories > fountain node and set the following properties:
      Property Setting
      Functions Fluid Film Thickness

      Particle > Particle Diameter

      Volume Fraction > Volume Fraction of Air

      Volume Fraction > Volume Fraction of Water
      Inputs

      Regions > Floor shell

      Regions > Fountain

      Derived Parts > Isosurface

      Lagrangian Phases > Water Droplets
    4. Select the fountain > Update > Time-Step Frequency node and set Frequency to 50.
  3. Open the Scenes > Multi-Regime Flow scene.
  4. Click Scene/Plot and make the following changes:
    1. Select the Multi-Regime Flow > Water > Parts node and set Parts to Derived Parts > Isosurface.
    2. Edit the Water Droplets node and set the following properties:
      Node Property Setting
      Water Droplets Point Scale Mode Scalar
      Point Size Scale Field Function Parcel > Parcel Size
      Map Values Activated
      Map Size Minimum 0.002 m
      Map Size Maximum 0.01 m
      Parts Parts Lagrangian Phases > Water Droplets
      Scalar Field Function Particle > Particle Diameter
    3. Edit the Water Film node and set Parts to Regions > Floor shell > Boundaries > Interface to Fountain [In-place 1].
      Node Property Setting
      Parts Parts Regions > Floor shell > Boundaries > Interface to Fountain [In-place 1]
      Scalar Field Function Fluid Film Thickness
  5. Save the simulation.