How to enable the ”chemical“ interface？

MFiX
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#1

Hello, developers,I would like to ask why my ”chemical“ interface is gray？How to use ”chemistry“ normally？
Looking forward to any possible answers! Thank you very much!

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#2

Chemistry is enabled when there are more than one species defined. Without species to react, there can be no reactions.

#3

Thank you very much for your answer！But how to define multiple species？Sorry，I didn’t know much because I first started learning MFIX.

#4

Fluid species are defined in the Fluid pane, solids in the Solids pane.
I suggest you take a look at some of the “Reacting flows” tutorials:
https://mfix.netl.doe.gov/doc/mfix/23.1/html/tutorials/advanced_tutorials.html