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We don't need to set any parameters for the wall pipewall zone. FLUENT will automatically detect that this location should be set as a wall based on its name. Verify this by selecting that zone and looking at its type in the drop down menu.

Next, let's look at the centerline. Since we are solving an axisymmetric problem, we will set the centerline as the axis; this will impose symmetry at this boundary. Set centerline to axis boundary type, using the drop down menu. Click Yes and OK to confirm.

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Choose inlet and click on Edit..... This boundary is set to velocity-inlet type by default which is right in our case. Change the Velocity Specification Method to Magnitude, Normal to Boundary. Enter 1 m/sfor Velocity Magnitude. This indicates that the fluid is coming in normal to the inlet at the rate of 1 meter per second. Select Intensity and Hydraulic Diameter next to the Turbulence Specification Method. Then enter 1% for Turbulence Intensity and 0.2m for Hydraulic Diameter. Click OK to set the boundary conditions for the inlet.

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Let's setup the reference values, which will be used later on while calculating resultswhile viewing non-dimensional results (this setting doesn't affect the numerical solution).

Problem Setup > Reference Values
Select Compute from > inlet.

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