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# Physics Setup

### Governing Equations

In the following video, we go into FLUENT and specify the governing equations that we will use.

HTML
<iframe width="640" height="360" src="//www.youtube.com/embed/67tPSoxGw4o" frameborder="0" allowfullscreen></iframe>

Summary of steps in the above video:

1. Fluent Launcher
1. Select double precision
2. Select parallel and choose the number of cores, I recommend using as many as you have but note that you need a special HPC license if you choose to use more than 4 cores.
2. Models
1. Edit viscous
1. K-omega
2. SST
3. Cell zone conditions
1. Edit Fluid
1. Enable Frame Motion
2. Specify angular velocity to be -2.22 m/s

### Boundary Conditions

We now specify the boundary conditions.

HTML
<iframe width="640" height="360" src="//www.youtube.com/embed/09ZoFt7U4MQ" frameborder="0" allowfullscreen></iframe>

Summary of steps in the above video:

...

1. Inlet
1. Velocity magnitude: 12m/s
2. Inlet-Top
1. Component (X,Y,Z): (0,0,-12m/s)
1. Default, wall
4. Periodic 1 and Periodic 2
1. Change to Interface

...

Info

### This module is from our free online simulations course at edX.org (sign up here). The edX interface provides a better user experience and the content has been updated since it was first recorded, so we recommend that you go through the module there rather than here. Also, you will be able to see answers to the questions embedded in the module there.

...

Note

The order in which the interface zones is selected matters because of how the offset is computed.

Make the first interface zone periodic 1 and second interface zone periodic 2.

Otherwise, you may get the error: Cannot intersect two interfaces.

Note
title ANSYS 19.1 Users

To access the interface dialog shown in the above video, make sure "Period 1" and "Period 2" are labeled as interfaces under Boundary Conditions.

Once you do this, a section called "Mesh Interfaces" appears in the tree. Double click this. In the window that opens, click "Manual Create" at the bottom.

This opens the window that is shown in the above video. Follow the steps of the video from here.

Also: If you named both quadrilateral surfaces, but only one is now appearing in the Setup stage, rename them "surface 1" and "surface 2".

### Go to Step 5: Numerical Solution

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