Setting Boundary Conditions

Define the boundary types and specify the appropriate property values.

Specify conditions on the wall and inlet boundaries.

To set the boundary conditions:

  1. Edit the Regions > Boiling_Tube > Boundaries > Wall node and set the following properties:
    Node Property Setting
    Physics Conditions > Thermal Specification Condition Heat Flux
    Physics Values > Heat Flux Method Field Function
    Scalar Function WallHeatFluxIterationRamp

Set the phase conditions for the liquid and vapor phases at the inlet. The turbulence intensity and turbulent viscosity ratio are modified so that the settings match the Initial Conditions.

  1. Edit the In > Phase Conditions node and set the following properties:
    Node Property Setting
    Liquid > Physics Values
    Static Temperature Value $InletTemperature
    Turbulence Intensity Value 0.01
    Turbulent Viscosity Ratio Value 200
    Velocity Magnitude Method Field Function
    Scalar Function InletVelocity > Laboratory > i
    Volume Fraction Value 1.0
    Node Property Setting
    Vapor > Physics Values
    Sauter Mean Diameter Value 0.001
    Static Temperature Value $SaturationTemperature
    Velocity Magnitude Method Field Function
    Scalar Function InletVelocity > Laboratory > i
    Volume Fraction Value 0.0

Define the outlet boundary. The static temperature for the liquid and vapor phases at the outlet are set. These values are the same as for the inlet.

  1. Edit the Out > Phase Conditions node and set the following properties:
    Node Property Setting
    Liquid > Physics Values
    Static Temperature Value $InletTemperature
    Turbulence Intensity Value 0.01
    Turbulent Viscosity Ratio Value 10
    Volume Fraction Value 1.0
    Node Property Setting
    Vapor > Physics Values
    Sauter Mean Diameter Value 0.001
    Static Temperature Value $SaturationTemperature
    Volume Fraction Value 0.0


  2. Save the simulation.