Step 16: Loading and Comparing the Results to Those in a Refined Mesh

To this point you have been working with a coarse mesh. In this section you will compare the results from that mesh to those from a refined mesh:

1.   Select File/Load Results. The Load Results File dialog box appears.

2.   On the Load Results File dialog box, select Keep current cases loaded and keep the other settings unchanged.

3.   Select elbow3.cdat.gz (or elbow3.cdat) and click Open.

In the 3D Viewer, there are now two viewports: in the title bar for View1 you have elbow1, and in View2 you have elbow3. In the Outline tree view under Cases you have elbow1 and elbow3; all boundaries associated with each case are listed separately and can be controlled separately. You also have a new entry: Case / Case Comparison.

4.   In the Toolbar, select the Synchronize camera in displayed views icon .

If the two cases are not oriented in the same way, clear the Synchronize camera in displayed views icon and then select it again.

Examine the operation of CFD-Post when the two views are not synchronized and when they are synchronized:

1.   In the viewer toolbar, clear the Synchronize visibility in displayed views icon .

2.   With the focus in View 1, select Insert / Contour and create a contour of pressure on pressure outlet 7 that displays values in the local range.

Note that the contour appears only in View 1. When visibility is not synchronized, changes you make to User Location and Plots settings apply only to the currently active view.

3.   In either view (while in viewing mode), click on the Z axis on the triad. Both views show their cases from the perspective of the Z axis.

4.   In the viewer toolbar, select the Synchronize visibility in displayed views icon .

5.   With the focus on the view that contains elbow3, select Insert / Contour. Accept the default name and click OK. Define a contour that displays temperature on the symmetry plane:

Tab	Field	Value
Geometry	Locations	symmetry
	Variable	Temperature
	Range	Local
Render	Lighting	(clear)

Click Apply.

Note that the contour appears in both views. You can see the differences between the coarse and refined meshes:

Figure 1.13: Comparing Contour Plots of Temperature on Two Mesh Densities

You can now compare the differences between the coarse and refined meshes:

1.   In the Outline tree view, double-click Cases / Case Comparison.

2.   In the Case Comparison Details view, select Case Comparison Active and click Apply. The differences between the values in the two cases appear in a third view. Click the Z axis of the triad to restore the orientation of the views.

Figure 1.14: Displaying Differences in Contour Plots of Temperature on Two Mesh Densities

Now, revert to a single view that shows the original case:

1.   To remove the Difference view, clear Case Comparison Active and click Apply.

2.   To remove the refined mesh case, in the Outline tree view, right-click elbow3 and select Unload.