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In the Outline window, select Solution Controls to open the Solution Controls window. Ensure that the Courant Number is set to 5.0.

The Courant Number defines how stable the solution is. For the density based, implicit solver as in this tutorial, the Courant Number could be reduced if there is difficulty in obtaining convergence for the solution. 

Monitors

In the Outline window, click Monitors to open the Monitors window. In the Monitors window, select Residuals - Print,Plot and press Edit.... This will open the Residual Monitors window. We want to change the convergence criteria for our solution. Under Equation and to the right of Continuity, change the Absolute Criteria to 1e-6. Repeat for x-velocity, y-velocity, and energy, then press OK.

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