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Numerical Solution

We'll use second-order discretization for the momentum equation, as in the laminar pipe flow tutorial, and also for the turbulence kinetic energy equation which is part of the k-epsilon turbulence model.

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Set Convergence Criteria

Recall that FLUENT reports a residual for each governing equation being solved. The residual is a measure of how well the current solution satisfies the discrete form of each governing equation. We'll iterate the solution until the residual for each equation falls below 1e-6.

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Select Print to Console and Plot under Options (these are the defaults). This will print as well plot the residuals as they are calculated which you will use to monitor convergence.

Click OK.

Set Initial Guess

We'll use an initial guess that is constant over the entire flow domain and equal to the values at the inlet:

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This completes the problem specification. Save your project.

Iterate Until Convergence

Solve for 700 iterations.

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We need a larger number of iterations for convergence than in the laminar case since we have a finer mesh and are also solving additional equations from the turbulence model.

Setup Data Export

In addition to the standard data quantities, we would also like to view the results for the Skin Friction Coefficient. This quantity is not transferred to the post-processor by default; so we have to do it manually.

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Under Additional Quantities, select Skin Friction Coefficient, which should be roughly half way down. Your window should now look like this:

Go to ResultsSee and rate the complete Learning ModuleStep 6: Numerical Results

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