Setting up the Models

Training Guide > Compressible Flow Tutorials > Transonic Flow over an Airfoil > Setting up the Models

Setting up the Models

Models define the spatial and temporal solution methods and the physical properties of the flow. In this example, the flow is steady, turbulent and compressible. The default Spalart-Allmaras turbulence model and the ideal gas model will be used. The analysis will also use the coupled solver, which is recommended for all supersonic and transonic compressible flows.

By default, a continuum called Physics 1 is created when the mesh is imported. To use a more appropriate name:

Right-click the Physics 1 node and select Rename...

The Rename dialog will appear. Change the name to Aerofoil.

Click OK.

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

Right-click the Aerofoil continuum node and select item Select models...

In the Physics Model Selection dialog, select the Two Dimensional radio button in the Space group box.

This changes the group types that now appear in the dialog as shown below.

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

Select Stationary in the Motion group box.

Select Gas in the Material group box.

Select Coupled Flow in the Flow group box.

Select Ideal Gas in the Equation of State group box.

Select Steady in the Time group box.

Select Turbulent in the Viscous Regime group box.

Select Spalart-Allmaras Turbulence in the Turbulence group box.

The Physics Model Selection dialog should look as shown below when you are done.

Click Close.

Save the simulation by clicking the (Save) button.

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