Abstract
Numerical simulations show that natural convection in tall Hele–Shaw slots has a dynamics similar to that of the convection loop. A Hopf bifurcation followed by homoclinic explosion is the route of transition to chaotic flow. The Hopf bifurcation leads to one-sided periodic motion while the homoclinic bifurcation point is the origin of the two-sided diagonal oscillation. Periodic regimes are separated by a Lorenz-type strange attractor. The instability of an internal boundary layer is the physics underlying the diagonal oscillation.
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