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Step 1: Pre-Analysis and Start-Up

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Strategy for Creating Geometry

In order to create the rectangle, we will first create the vertices at the four corners. We'll then join adjacent vertices by straight lines to form the "edges" of the rectangle. Lastly, we'll create a "face" corresponding to the area enclosed by the edges. In Step 2, we'll mesh the face i.e. the rectangle. Note that in 3D problems, you'll have to form a "volume" from faces.

Create a Working Directory

Create a folder called pipe in a convenient location. We'll use this as the working folder in which files created during the session will be stored.

Start ANSYS FLUENT

We'll run FLUENT within the ANSYS Workbench interface.  Start ANSYS workbench:

Start> All Programs> Ansys 12.1> Workbench

The following figure shows the workbench window. 
Go to Step 2: Geometry