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Setup and Solution

a.Enter nozzle for Zone Name.

This name is more descriptive for the zone than wall-2.

b.Click the Thermal tab.

i.Retain the default selection of Heat Flux in the Thermal Conditions list.

ii.Retain the default value of 0 for Heat Flux, so that the wall is adiabatic.

c.Click OK to close the Wall dialog box.

13.5.7. Initial Reaction Solution

You will first calculate a solution for the basic reacting flow neglecting pollutant formation. In a later step, you will perform an additional analysis to simulate NOx.

1. Solution → Solution → Methods...

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Retain the default selections.

2.Ensure the plotting of residuals during the calculation.

Solution → Reports → Residuals...

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Setup and Solution

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

b.Click OK to close the Residual Monitors dialog box.

3.Initialize the field variables.

Solution → Initialization

a.Retain the default Hybrid initialization method and click Initialize to initialize the variables.

4.Save the case file (gascomb1.cas.gz).

File → Write → Case...

a.Enter gascomb1.cas.gz for Case File.

b.Ensure that Write Binary Files is enabled to produce a smaller, unformatted binary file.

c.Click OK to close the Select File dialog box.

5.Run the calculation by requesting 200 iterations.

Solution → Run Calculation → Advanced...

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a.Enter 5 for the Timescale Factor.

The Timescale Factor allows you to further manipulate the computed Time Step calculated by ANSYS Fluent. Larger time steps can lead to faster convergence. However, if the time step is too large it can lead to solution instability.

b.Enter 200 for Number of Iterations.

c.Click Calculate.

6.Save the case and data files (gascomb1.cas.gz and gascomb1.dat.gz).

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