How to define custom volumetric reaction rate in a porous medium?
It is possible to define a custom volumetric reaction rate through a DEFINE_VR_RATE UDF (User-Defined Function) macro. In the case of a porous zone, the actual reaction will take place in only the fluid region of the porous medium, therefore, the true reaction rate is the value defined in DEFINE_VR_RATE multiplied by the porosity.
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