Exercises

Exercise 1

When setting up this simulation, we chose to use the k-epsilon turbulence model. We mentioned that changing these values should not have a large impact on the results of the simulation. As an exercise, try varying the values of k and epsilon and compare them with the original results. When specifying the inlet conditions, change the method to "Turbulent Intensity-Turbulent Length Scale". Set the intensity to 0.5%, and the length scale to 0.000588m.

Enrichment Exercises

Plotting Temperature Profiles

One can look at the temperature profiles before and after the heated section.

Duplicate the Axial Velocity Profiles chart by right-clicking on the plot name in the "tree" on the upper left. Rename it as "Temperature Profiles".

Double-click on "Temperature Profiles" in the tree view to edit its properties. This should be just below "Axial Velocity Profiles" in the list.

Change the title and x-axis variable (to Temperature). Click Apply. Here's what we get.

This plot shows that:

• the temperature increases in the heated section
• the temperature is much higher near the wall in the heated section
• the temperature is nearly uniform at the end of the mixing section
  All these trends are as expected.

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