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Click on Boundary Conditions tab on the left hand side pane. Choose Outlet and click Edit....Change the Turbulence Specification Method to Intensity and Hydraulic Diameter. Set Backflow Turbulent Intensity to 10% and Backflow Hydraulic Diameter to 0.0127m. Click OK.

Next, click on Solution Methods tab on the left hand side pane. Choose Second Order Upwind for Turbulent Kinetic Energy and Turbulent Dissipation Rate. 

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Click on Monitors > Residual  and click Edit.... Set 1e-06 for k and epsilon and click  epsilon. In order to get faster convergence, choose 1e-05 for continuity and click OK.

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The solution converges in about 600 iterations. 

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