I have hooked the surface reaction UDF DEFINE_SR_RATE to a surface reaction in Fluent. When I run Fluent, the rate for that surface reaction is always zero, no matter what is specified in the UDF. The UDF is properly hooked. What could be wrong? Also, if both Arrehnius coefficients ( via GUI) and DEFINE_SR_RATE are specified for a surface reaction, which will take precedence?
June 5, 2023 at 7:06 amFAQParticipant
The reaction is likely missing from the reaction mechanism. Surface reactions must be included in the reaction mechanism by editing the mechanism in the Mixture Template. There, make sure that the Reaction Type is set to “All” so that the surface reaction can be included in the mechanism. UDFs that are hooked and apply to a given surface reaction will take precedence over any coefficients that are defined in the GUI.
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