Randomic Porosity in Fluent

Good afternoon everyone, could someone help me?

I am working with porous media and I want to set a random porosity in my domain. I tried a DEFINE_PROFILE, but it calculates random values for my porosity at each iteration, but I only want it to calculate the profile once and use it for the rest of the calculations.

I tried creating a DEFINE_INIT, and I was able to initialize random values and associate them with a UDS variable, but I can't associate these values from the profile generated in the cell zone conditions.

Does anyone have any ideas?

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