Termite Mound Passive Ventilation Stack (2D)

Fungus-farming termite mounds keep their underground nest breathable without a single moving part, using the same physics that draws smoke up a chimney. Metabolic heat from the colony and its fungus garden warms the core air relative to the outside; that density difference drives a slow convective draft — warm air rising through a central chimney and exiting near the top, drawing cooler air in through peripheral channels near the base. This 2D cross-section goes one step further than a static ΔT slider: it solves a real coupled heat-balance and buoyancy-driven duct-flow model, so the internal temperature and draft strength genuinely self-regulate as you change how much heat the colony produces and how hot it is outside.