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[FAQ]

When model changes are made, like switching from one turbulence model to another which is using different transport equations/parameters, and when monitors of model specific parameters have been defined, the solver will give an error similar to this: Error: Cell_Function_Values: unrecognized function: production or primitive error: unrecognized function: turbulent This is due to the solution monitors, which no longer have access to the model parameter like turbulent parameters used by the previous turbulence model. Check in the Solution->Monitor menu whether any of your surface or volume monitors are using undefined parameters. If so, change the parameter to one in the drop-down list, which is refreshed once the model has been changed.