Setting up the Models

Training Guide > Multi-Phase Flow Tutorials > Capillary Effects 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 laminar and a gravity force is applied in the +x direction.

As the problem also involves multi-phase flow, two fluids (air and glycerine) are required for the analysis. However, since these occupy the same domain, only one continuum and one 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 Injector. Click OK.

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

Open the Continua node, right-click on the Injector node and select menu 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 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 Laminar in the Viscous Regime group box.

Select Gravity in the Optional Physics Models group box.

Select Surface Tension in the Optional Models group box.

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

Click Close.

Save the simulation by clicking on the

(Save) button.

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