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We see that we need to provide a convergence criterion for each PDE that is being solved. The solver will stop iterating when mass, momentum, energy, k and epsilon imbalances (called residuals) fall below the convergence tolerance. We'll use a residual tolerance of 10^-6 for all six PDE's being solved. FLUENT will consider the iterations have converged when all six residuals have fallen below this tolerance. Set the residuals tolerance as shown in the figure below. Make sure to scroll down and set the tolerance for k and epsilon equations also. 

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Solution > Run Calculation 
Enter 500 for Number of Iterations and click Calculate. Note that 500 is the maximum number of iterations we want the solver to carry out. You will see a window message saying Calculating the solution... Wait for FLUENT to finish the calculation. Our solution converges in about 350 - 400  iterations. So the solver will stop the iterations before it reaches the maximum number of iterations specified (500). You should see a residual plot on screen as the computation is being performed. It should look something like this:

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