Save the blocking file.
> >
Save the mesh in unstructured format with the default name
hex.unsto the working directory.
> > The mesh will automatically be loaded.
Write the input file for Ansys Fluent.
>

Select Ansys Fluent from the Output Solver drop-down list.
Click .
Set the appropriate boundary conditions.
>
Set the boundary condition for ELBOW_1_1 to wall.
Click Create new under ELBOW_1_1.

Select wall from the list of Boundary Conditions in the Selection dialog box.
Click .
Enter the zone ID, if required.
Similarly, set the boundary conditions for INLET to velocity-inlet and OUTLET to pressure-outlet, exhaust-fan, outlet-vent.
Set the boundary conditions for FLUID to fluid and SOLID to solid.

Click after setting the boundary conditions.
Note: Mixed/unknown refers to the dimension of the elements in a part. If a part contains all volume elements, it clearly belongs in the Volumes branch. Similarly, parts in the Surfaces branch should contain only shell elements, and the Edges branch should contain only curve elements, and so on. However, if a part has a mixture of surfaces, curves and points, then the mesh will contain a mixture of element types and the part will be located in the Mixed/unknown branch of the tree. If you apply wall properties, these are applied to the shells in that part only.
Write the input file for Ansys Fluent.
>
Select the appropriate .uns file.
The Ansys Fluent dialog will appear.

Enter elbow for Output file.
Click .
You can read this mesh file and proceed to setup and solve in Ansys Fluent.