Visualizing the Results

Training Guide > Combustion Tutorials > Adiabatic PPDF Equilibrium Tutorial > Visualizing the Results

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Visualizing the Results

Go to the Geometry Scene 1 display to view the temperature profile for the converged solution.

Right-click on the scalar bar in the Geometry Scene 1 display and select Mass Fraction of C3H8.

Now examine the CO₂ profile.

The predicted maximum temperature in the model is lower than what would normally be expected from this type of combustor. It is therefore instructive to consider the likely accuracy of the temperature distribution obtained in this tutorial. A good quality measure to use for this purpose is the ratio

(1)

where is the mean mixture fraction and its variance. We will create a field function for this ratio and display its distribution within the combustor geometry.

Right-click the Tools > Field Functions node and select New Function.

Right-click the new User Field Function 1 node and select Rename....

Change the name of the field function to Quality Ratio.

In the Properties window, change the Function Name property to QualityRatio, then enter the Definition property as shown below.

Note that the value of this function in regions of very low mixture fraction is set to zero. This is because the function is a useful measure only within the combustion region.

Select the Geometry Scene 1 > Displayers > Section Scalar 1 node.

In the Properties window, change the Contour Style property to Filled.

In the Geometry Scene 1 display, right-click on the scalar bar and select Quality Ratio.

The resulting scene is shown below.

It will be seen that the ratio's value is generally rather high, implying that the predicted maximum temperature is considerably lower than the adiabatic flame temperature. In a realistic modeling exercise, a considerably finer mesh would be needed to increase confidence in the calculated temperatures.

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