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In the Outline window, select Solution Methods to open the Solution Methods window. Under Spatial Discretization, ensure that the option under option for Flow is specified as Second Order Upwind is selected.. (Hint: If you don't see Flow, go back and ensure that you changed the solver from Pressure-based to Density-based under the General tab.)

Solution Controls

In the Outline window, select Solution Controls to open the Solution Controls window. Ensure . (Note: In later versions, this is simply named Controls.) Ensure that the Courant Number is set to 5.0.

The Courant number can be considered a non-dimensionalized timestep. The density-based solver obtains the steady-state solution by starting with the initial guess and marching in pseudo-time until convergence is obtained. The Courant number controls the time step the solver uses. The larger it is, the faster the solution will converge but it will not be very stable and can diverge. The smaller it is, the slower it is to reach convergence but the solution is much more stable.

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In the Outline window, click Monitors to open the Monitors window outline. In the Monitors window outline, select Residuals - Print,Plot and press Edit...double-click Residuals. 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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