Current conservation equation implementation
 

Hello.

I am currently trying to develop a low-temperature PEM electrolysis model based on the fluent's fuel cell/electrolysis add-on model via UDF/UDS and I am having trouble understanding how to implement the current conservation equation (equation 3.24 of the ANSYS Fluent Advanced Add-On Modules manual, Chapter 3: Fuel Cell and Electrolysis Model Theory) on the code.

Does anyone know how to set an integral-based equation as a convergence criteria?

Thank you!