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Setup and Solution

a.Ensure w-high-y is selected in the From Boundary Zone selection list.

b.Select w-low-y from the To Boundary Zones selection list.

c.Click Copy.

d.Click OK when the Question dialog box opens asking whether you want to copy the boundary conditions of w-high-y to all the selected zones.

e.Close the Copy Conditions dialog box.

8.4.8. Obtaining the Solution

1.Set the solution parameters.

Solution → Solution → Methods...

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Select Body Force Weighted from the Pressure drop-down list in the Spatial Discretization group box.

2.Set the convergence criteria for you simulation.

Solution → Reports → Residuals...

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Setup and Solution

a.Ensure that Plot is enabled in the Options group box.

b.Enter 0.0001 for the Absolute Criteria of continuity, x-, y-, and z-velocity.

c.Enter 1e-7 for the Absolute Criteria of energy.

Decreasing the criteria for these residuals will improve the accuracy of the solution.

d.Click OK

3.Initialize the solution.

Solution → Initialization

a.Retain the default selection of Hybrid Initialization from the Initialization Methods list.

b.Click Initialize.

4.Create a surface report definition to aid in judging convergence.

It is good practice to use reports of physical solution quantities together with residual monitors when determining whether a solution is converged. In this step you will create a surface report definition for the average temperature on the z=0 plane.

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a.Create the new surface, zz_center_z.

Domain → Surface → Create → Iso-Surface...

i.Enter zz_center_z for New Surface Name.

Note

If you want to delete or otherwise manipulate any surfaces, click Manage... to open the Surfaces dialog box.

ii.Select Mesh... and Z-Coordinate from the Surface of Constant drop-down lists.

iii.Click Compute and retain the default value of 0 for Iso-Values.

iv.Click Create and close the Iso-Surface dialog box.

b.Create the surface report definition.

Solution → Reports → Definitions → New → Surface Report → Area-Weighted Average...

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Setup and Solution

i.Enter surf-mon-1 for the Name of the surface report definition.

ii.In the Create group box, enable Report Plot and Print to Console.

Note

Unlike residual values, data from other reports is not saved as part of the solution set when the ANSYS Fluent data file is saved. If you want to access the surface report data in future ANSYS Fluent sessions, you can enable the Report File option. The report file will be saved in your working directory.

iii.Select Temperature... and Static Temperature from the Field Variable drop-down lists.

iv.Select zz_center_z from the Surfaces selection list.

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v.Click OK to save the surface report definition settings and close the Surface Report Definition dialog box.

5.Save the case file (rad_a_100.cas.gz).

File → Write → Case...

6.Start the calculation by requesting 400 iterations.

Solution → Run Calculation→Advanced...

a.Select User Specified from the Time Step Method list.

b.Retain the default value of 1 for Pseudo Time Step.

c.Enter 400 for Number of Iterations.

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Setup and Solution

d. Click Calculate.

Figure 8.3: Temperature Surface Report

The surface report history shows that the average temperature on zz_center_z has stabilized, thus confirming that the solution has indeed reached convergence. You can view the behavior of the residuals (Figure 8.4: Scaled Residuals (p. 297)) in the Scaled Residuals graphics window tab.

Figure 8.4: Scaled Residuals

7.Save the case and data files (rad_a_100.cas.gz, rad_a_100.dat.gz).

File → Write → Case & Data...

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