Creating Phases and Selecting Phase Models

Create the phases and select the appropriate phase models.

The two phases flowing through the coolant section of vertical pipe are water and steam. These phases are defined by creating them under the Eulerian Phases model, and selecting the corresponding material properties.

To create the phases and select the phase models:

Create the liquid phase.

In the Coolant continuum, right-click the Models > Multiphase > Phases node and create a phase.
Rename the Phase 1 node to Liquid.

For the Liquid phase, select the following models:


Group Box	Model
Enabled Models	Flow (Pre-selected) Turbulent (Pre-selected)
Material	Liquid Reynolds-Averaged Navier-Stokes (Selected automatically)

Deactivate Auto-select recommended models.

Select the following models in order:


Group Box	Model
Reynolds-Averaged Turbulence	K-Epsilon Turbulence
K-Epsilon Turbulence Modelss	Standard K-Epsilon Wall Distance (Selected automatically)

Activate Auto-select recommended models.

Select the following models in order:


Group Box	Model
Enabled Models	High y+ Wall Treatment (Selected automatically)
Equation of State	Constant Density
Energy	Segregated Fluid Temperature

Click Close.
Rename the Liquid > Models > Liquid > H2O node to H2O (l).

Create the gas phase.

Create a second phase and rename it to Vapor.

For the Vapor phase, select the following models:


Group Box	Model
Enabled Models	Flow (Pre-selected) Turbulent (Pre-selected)
Material	Gas Reynolds-Averaged Navier-Stokes (Selected automatically)

Deactivate Auto-select recommended models.

Select the following models in order:


Group Box	Model
Reynolds-Averaged Turbulence	K-Epsilon Turbulence
K-Epsilon Turbulence Models	Standard K-Epsilon Wall Distance (Selected automatically)

Activate Auto-select recommended models.

Select the following models in order:


Group Box	Model
Enabled Models	High y+ Wall Treatment (Selected automatically)
Equation of State	Constant Density
Energy	Segregated Fluid Temperature

Click Close.
Rename the Vapor > Models > Gas > Air node to H2O (g).

The Phases node appears as shown.

The material properties for each phase are now modified, starting with the water phase.

Edit the Liquid > Models > Liquid > H20 (l) > Material Properties node and set the following properties:


Node	Property	Setting
Density > Constant	Value	745.65 kg/m^3
Dynamic Viscosity > Constant	Value	9.253E-5 Pa-s
Heat of Formation > Constant	Value	1276100 J/kg
Specific Heat > Constant	Value	5310.0 J/kg-K
Standard State Temperature > Constant	Value	560.65 K
Thermal Conductivity > Constant	Value	0.574 W/m-K

Next set the properties of the vapor phase:

Edit the Vapor > Models > Gas > H2O (g) > Material Properties node and set the following properties:


Node	Property	Setting
Density > Constant	Value	37.52 kg/m^3
Dynamic Viscosity > Constant	Value	1.9034E-5 Pa-s
Heat of Formation > Constant	Value	2770300 J/kg
Specific Heat > Constant	Value	5440 J/kg-K
Standard State Temperature > Constant	Value	560.65 K
Thermal Conductivity > Constant	Value	0.06514 W/m-K

Save the simulation.