To accelerate convergence and just solve the flow equations initially without turbulence, go to Solution - Solution Controls - Equations. Unselect Turbulence and press OK.
Go to Solution - Run Calculation. Run the calculation for 2000 iterations, monitoring the residuals. Now go back to Solution - Solution Controls - Equations. Select Turbulence and press OK. Run the solution for additional iterations until you obtain steady state residuals. The final plot should look like the figure below.
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