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Solution > Monitors > Residuals - Print, Plot > Edit...

We see that we need to provide a convergence criterion for each PDE that is being solved. 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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