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14.3.3 Using the Multiple Surface Reactions Model for Discrete-Phase Particle Combustion

When you use the multiple surface reactions model, the procedure for setting up a problem involving a discrete phase is slightly different from that outlined in Section  22.11. The revised procedure is as follows:

1.   Enable any of the discrete phase modeling options, if relevant, as described in Section  22.11.5.

2.   Specify the initial conditions, as described in Section  22.12.

3.   Define the boundary conditions, as described in Section  22.13.

4.   Define the material properties, as described in Section  22.14.


You must select multiple-surface-reactions in the Combustion Model drop-down list in the Materials panel before you can proceed to the next step.

5.   If you have defined more than one particle surface species, for example, carbon ( C $<$s $>$) and sulfur ( S $<$s $>$), you will need to return to the Set Injection Properties panel (or Set Multiple Injection Properties panel) to specify the mass fraction of each particle surface species in the combusting particle. Click the Multiple Reactions tab, and enter the Species Mass Fractions. These mass fractions refer to the combustible fraction of the combusting particle, and should sum to 1. If there is only one surface species in the mixture material, the mass fraction of that species will be set to 1, and you will not specify anything under Multiple Surface Reactions.

6.   Set the solution parameters and solve the problem, as described in Section  22.15.

7.   Examine the results, as described in Section  22.16.


Unsteady particle tracking cannot be performed when the multiple surface reactions model is used.

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