For a reaction in porous zone, DEFINE_SR_RATE udf was used. Fluent returns warning : Zero number of gas phase reactions, when UDF hooked and run the calcualtion. Is it usual, as there is only surface reaction? Does I am setting any thing wrong.

Volumetric and wall surface enabled in Species Transport window and wall surface enabled in reaction window.

Does any one come across such a warning?

Thank you

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