Numerical Solution

Solution Methods

In the Outline window, select Solution Methods to open the Solution Methods window. Under Spatial Discretization, ensure that the option under Flow Second Order Upwind is selected.

Solution Controls

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 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.

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.

Solution Initialization

In the Outline window, select Solution Initialization. We need to make an "Initial Guess" to the solution so FLUENT can iterate to find the final solution. In the Solution Initialization window, select Standard Initialization, then under Compute from, select farfield from the drop down box. Check to see that the values that generate match our inputted values, then press Initialize

Run Calculation

In the Outline window, select Run Calculation. Change the Number of Iterations to 4000. Double click Calculate to run the calculation. It should a few minutes to solve. After the calculation is complete, save the project. Do not close FLUENT. 

Go to Step 6: Numerical Results

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