16.6.4 Postprocessing the Flamelet Data

For the flamelet model, you can display or write flamelet curves. Click the Display Flamelets... or Display Unsteady Flamelet... button. If you have a single flamelet, as for the unsteady flamelet model, you can access the Flamelet 2D Curves dialog box (Figure  16.6.3).

Figure 16.6.3: The Flamelet 2D curves Dialog Box

For the steady flamelet model with more than one flamelet, you can display 2D plots and 3D surfaces showing the variation of species fraction or temperature with the mean mixture fraction or scalar dissipation using the Flamelet 3D Surfaces dialog box (e.g., Figure  16.6.4).

To access this dialog box, click the Display Flamelets... button in the Flamelet tab of the Species Model dialog box, as shown in Figure  16.6.1.

Figure 16.6.4: The Flamelet 3D Surfaces Dialog Box

To display the flamelet tables graphically, use the following procedure:

1.   In the Flamelet 3D Surfaces dialog box, in the Plot Variable drop-down list, you can select temperature or species fraction as the variable to be plotted.

2.   Specify the Plot Type as either 3D Surface or 2D Curve on 3D Surface.

• For a 3D surface, enable or disable Draw Numbers Box under Options. When this option is turned on, the display will include a wireframe box with the numerical limits in each coordinate direction.

• For a 2D curve on a 3D surface:

  (a)   Specify whether you want to write the plot data to a file by toggling Write To File under Options.

  (b)   Specify the X-Axis Function against which the plot variable will be displayed by selecting Scalar Dissipation ( $\chi$), or Mixture Fraction ( $f$). The variable that is not selected will be held constant.

  (c)   Specify the type of discretization (i.e., how the flamelet data will be sliced) for the variable that is being held constant (under Constant Value of Mixture Fraction or Constant Value of Scalar Dissipation).

  • If you selected Index under Slice by, specify the discretization Index of the variable that is being held constant. The range of integer values that you are allowed to choose from is displayed under Min and Max, and is equivalent to the number of points specified for that variable in the Flamelet tab of the Species Model dialog box (see Section  16.6).

  • If you selected Value under Slice by, specify the numerical Value of the variable that is being held constant. The range of values that you can specify is displayed under Min and Max.

3.   Write or display the flamelet table results. If you have turned on the Write To File option for a 2D plot, click Write and specify a name for the file in the Select File dialog box (see Section  2.1.6). Otherwise, click Plot or Display as appropriate to display a 2D plot or 3D surface in the graphics window.

Figures  16.6.5 and 16.6.6 show examples of a 2D curve plot and 3D surface plot of a flamelet table.

Figure 16.6.5: Example 2D Plot of Flamelet Data

Figure 16.6.6: Example 3D Plot of Flamelet Data