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Double click on Setup in the Workbench Project Page which will bring up the FLUENT Launcher. When the FLUENT Launcher appears change the Options to "Double Precision", and Processing Options to "Parallel (Local Machine)" with Number of Processes equal to "4" or to the available number of processors at your end. Click OK as shown below.
Twiddle your thumbs a bit while the FLUENT interface starts up. This is where we'll specify the governing equations and boundary conditions for our problem. On the left-hand side of the FLUENT interface, we see various items listed under Problem Setup. and Solution. We will work from top to bottom of both these items to setup the physics of our boundary-value problem. On the right hand side, we have the Graphics pane and, below that, the Command pane.
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For incompressible flows, the energy equation is decoupled from the continuity and the momentum equations. So the energy equation is not solved. Make sure that Energy is set to Off in Problem Setup > Models > Energy.
Define Material Properties
Now, the properties of the fluid that is being modeled will be specified. The properties of the fluid were specified in the Problem Specification section. In order to create a new fluid(Click) Materials > Fluid > Create/Edit... as shown in the image below.