Setting up the Models

Training Guide > Multi-Phase Flow Tutorials > Gravity-Driven Flow Tutorial > Setting up the Models

Setting up the Models

Models define the primary variables of the simulation, including pressure, temperature, velocity, and what mathematical formulation will be used to generate the solution. In this example, the flow is turbulent. The default K-Epsilon turbulence model will be used and a gravitational force applied in the -y direction.

As the problem also involves multi-phase flow, two fluids (air and water) are required for the analysis. However, since these occupy the same domain, only one continuum and one mesh region are required to set up the simulation.

A default continuum called Physics 1 is automatically created when the mesh is imported.

To use a more appropriate name for it, right-click on the Physics 1 node and select Rename...

The Rename dialog will appear.

Change the name to Chambers. Click OK.

The continuum definition will now be edited in order to select appropriate physical models for the fluids.

Right-click on the Continua > Chambers node and select item Select models...

In the Physics Model Selection dialog:

Select the Two Dimensional radio button in the Space group box.

Select the Stationary radio button in the Motion group box.

The dialog will now guide you through the model selection process by showing only options that are appropriate to the initial choices made. Using the same technique as in the previous step:

Select Multi-Phase Mixture in the Material group box.

Select Implicit Unsteady in the Time group box.

Select Turbulent in the Viscous Regime group box.

Select K-Epsilon Turbulence in the Reynolds-Averaged Turbulence group box.

Select Gravity in the Optional Physics Models group box.

The Physics Model Selection dialog should look like this when you are done.

Click Close.

Save the simulation by clicking the

(Save) button.

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