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15.7.3 Enabling a Secondary Inlet Stream

If you are modeling a system consisting of a single fuel and a single oxidizer stream, you do not need to enable a secondary stream in your PDF calculation. As discussed in Section  15.2.1, a secondary stream should be enabled if your PDF reaction model will include any of the following:

To include a secondary stream in your model, turn on the Secondary Stream option under Options in the Chemistry tab.

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Using a secondary stream substantially increases the calculation time for your simulation since the multi-dimensional PDF integrations are performed in FLUENT at run-time.


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