In a student project we are currently doing, we have been trying to use Grasshopper’s Honeybee zones to simulate air being heated as it rises behind a solar heated surface, also called the buoyancy effect or stacking.
The project is about simulating the heat flow behind solar facade panels and, simulate the air temperatures behind the panels.
We have already been looking at trombe-walls, but can’t seem to find anything related and comparable with this in Grasshopper.
My question is, if anyone have been trying to simulate this before, if not in Grasshopper where else? You can also take a look at our Grasshopper file to see if there are errors (which there probably are 
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We have attempted to make it parametric in order to later apply it to a full scale building facade simulation, so we can compare with real life results and other simulations.
Simulating Stacking Effect.gh (735.9 KB)
(We are students and not professionals)