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Second Order Scheme
A second-order discretization sche=
me will be used to approximate the solution. In order to implement the seco=
nd order scheme click on Solution Methods then cl=
ick on Momentum and select Second Order Upwind as shown in the image below.
Set Convergence Criteria
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. W= e'll iterate the solution until the residual for each equation falls below = 1e-6. In order to specify the residual criteria (Click) Monitors > Residuals > Edit...= , as shown in the image below. <= /span>
Next, change the residual under&nb= sp;Convergence Criterion for continuity, x-velocity,and y-velocity, all to 1e-6, as can be seen below.
Lastly, click OK to close the Re= sidual Monitors menu.
Set Initial Guess
Here, the flow field will be initi= alized to the values at the inlet. That is, the initial values of all the c= ells will be set to 1 m/s and 0 Pa for x velocity and gauge pressure respec= tively. In order to carry out the initialization click on Solution Initialization then click on Compute from and select in= let as shown below. =
Then, click the Initialize button,
. This completes the initialization process.
Alternately, you could set the&nbs= p;Gauge Pressure to 0 and set the X Velocity to 1 m/s as shown below.
Then, you would need to press the&= nbsp;Initialize button to apply the specified initial = values to all the cells. Either method will give you the same results.
Iterate Until Convergence
Prior, to running the calculation = the maximum number of iterations must be set. To specify the maximum number= of iterations click on = Run Calculation then set = the Number of Iterations= to 1000, as shown in the= image below.
As a safeguard save the project no= w. Now, click on Calcula= te two times in order to run the calculation. The residuals for each iteration a= re printed out as well as plotted in the graphics window as they are calcul= ated. After running the calculation, you should obtain the following residu= al plot.
The residuals fall below the specified convergence criterion of 1e-6 in = about 557 iterations, as shown below. Actual number of convergence steps ma= y vary slightly.
At this point, save the project once again.