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Note that "Mesh Interfaces" option appear on the main menu to the left.

To save time in the future, you can already assign the Go ahead and set the other interfaces Boundary Conditions. There is no quick way to do that, as Fluent does not allow you to Copy Interfaces Boundary Conditions. So, proceed as before and assign the following Zones to Interface:

blade_bot_in

blade_bot_outer

blade_right_in

blade_right_outer

blade_top_in

blade_top_outer

hub_inner

hub_outer

Now we're ready to finally create the interfaces!

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In the first box, "Mesh Interface", write "blade_bot". That's the name of the interface. No select as Interface Zone 1, blade_bot_in. For Interface Zone 2 select blade_bot_outer. Click "Create". The window will not close by it self, go ahead and close it.

FIGURE 6

Repeat this and create the remaining 3 interface zones.

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Be careful to select the correct in-outer pairs!!

Note: you don't have to close the Mesh Interface window all the time. But be aware that after selecting the first zone, a warning will pop saying that the second zone is already assigned to other interface. Just close the message and select the correct Interface Zone 2.

By the end of this step, you window should look like this.

FIGURE 7

Set Solver informations

Now, resuming...

Select the first option under "Setup": "General".

Here we can change key information about the solver, like whether it's steady or transient, planar or axisymmetric, etc.

For our problem, you can leave the default options, i.e., Pressure-Based 

Set the Model

Here is where we tell FLUENT all simplifications for the model it can assume. For instance, here you specify if the model is Inviscid, Laminar or Turbulent, if you should consider the Energy Equation (for supersonic flows), and other options.

For us, 

ADD MATCH CONTROL TO MESH? (see wind blade tutorial) 
Import mesh as a wbpz file instead o msh? 

(v) Mesh info > size to check number o elements

(v) It's always a good practice to check the mesh. Mesh > check and verify that there are no errors

 (skipped) Display mesh color by ID

before digging into the rest, we need to creat the mesh interfaces for the problem. The geometry is composed of 5 zones:
outer inner and inside blade zones. FIGURE showing this. The mesh created is "non-conformal" (i.e. the nodes does not match across the interface), so we need to tell Fluent that the ajudascent cells across that interface share information.

In order to do that, go under boundary conditions. set xxxx to interface. Note that "mesh interfaces" appeared under the setup menu. Click on that.

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To explain a little bit about the MFR method, see Numerical Results part, where I wrote something very short.

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