enrico

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Right now, when we specify <n_pins_x> and <n_pins_y> for the heat/fluids surrogate, it doesn't account for guide tubes, so we end up mapping and doing data transfers on regions that don't make sense.

Technically the temperatures of the guide tubes will be affected by the coolant temperature (no heat source = guide tube temp matches fluid temp), so there is some feedback, but it's probably very small and not super important to include in the surrogate anyways.

I think we could add a new parameter like guide_tube_indices to provide (x, y) integer indices for pins that are guide tubes and therefore have a different geometry and no heat source. We can include feedback with some modifications to set_heat_source (because we won't set up tallies for the guide tubes). Or, we could skip the feedback and just omit them from the mapping and not bother solving T/H on them. Which would you prefer?