Inertial waves are oscillations in a rotating fluid that arise due to the restoring action of the
Coriolis force. Low-frequency inertial waves are known to create columnar flow structures
inrapidly rotating systems. Columnar heat transport away from the equator has been
observed in some strongly forced, rapidly-rotating geodynamo simulations of the Earth's
core. In this study, we investigate the mechanism governing this heat transport by performing
direct numerical simulations of model problems comprising buoyant blobs under rapid …