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It is always a good practice to check mesh, specially if you are importing mesh that wasn't created by you. It is not frequent rare to get matching errors, particularly when meshes with multiple Cell-Zones like our case.

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You can also note that, when Fluent is first launched, the second menu box (described previously) contains the options for "General". There, on the first option you can see under "Mesh", the option for Checkan option to check the mesh was available, under "General". You can see this highlighted in the above figure.

Lastly, you can type "mesh/check" and hit Enter in the messages box (number 4 from previous description).

Create mesh interfaces

As briefly discussed, we need to start by creating the interfaces between the different zones of mesh.

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In the first box, "Mesh Interface", write "blade_bot". That's the name of the interface. No select Select as Interface Zone 1 , the 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.

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Note: you don't have to close the Mesh Interface window all the time. After clicking "Create" you can go ahead and give the name for the new Interface and create it.

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

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Now that we're done with Boundary Conditions, we're almost ready to run the simulation!

Save your project.

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

Go to Step 5: Numerical Solution

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