If your power is only a function of time or space and you can condense it to a mathematical equation, you can use expressions to input this function.
If the power cannot be condensed into a mathematical equation and you have a spatial and temporal distribution, you will have to use UDF to read the csv file. Please use the UDF manual as your guidepost to getting this data imported into Fluent. I'd strongly suggest trying to read this data for a serial run in the beginning. Parallelizing this UDF will take some effort and time.
Hope this helps.
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