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We'll use second-order discretization for the momentum equation, as in the laminar pipe flow tutorial, and also for the turbulence kinetic energy equation which is part of the k-epsilon turbulence model.

Problem Setup Solution > Solution Methods

Change the Discretization for Momentum, Turbulence Kinetic Energy and Turbulence Dissipation Rate equations to Second Order Upwind (if you do not see all of the equations scroll down to see them).

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Recall that FLUENT reports a residual for each governing equation being solved. The residual is a measure of how well the current solution satisfies the discrete form of each governing equation. We'll iterate the solution until the residual for each equation falls below 1e-6.

Problem Setup > Solution > Monitors > Residuals, Statistic and Force Monitors

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We'll use an initial guess that is constant over the entire flow domain and equal to the values at the inlet:

Problem Setup > Solution > Solution Initialization

In the Solution Initialization menu that comes up, choose inlet under Compute From. The Axial Velocity for all cells will be set to 1 m/s, the Radial Velocity to 0 m/s and the Gauge Pressure to 0 Pa. The Turbulence Kinetic Energy and Dissipation Rate(scroll down to see it) values are set from the prescribed values for the Turbulence Intensity and Hydraulic Diameter at the inlet.

Click Initialize. Close the Solution Initialization window. 

This completes the problem specification. Save your work:

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Solve for 100 iterations first.

Problem Setup > Solution  Solution > Run Calculation

In the Iterate menu that comes up, change the Number of Iterations to 100. Click Calculate.

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