Abstract
In turbulent Rayleigh-B\'enard convection in a cubic cell, a new oscillation is found in the temperature profile shape of the large-scale circulation (LSC). This geometry dependence is explained by a model which assumes that heat conducted to the LSC from thermal boundary layers is proportional to the LSC path length along the boundary layers at the top and bottom plates. In a non-circular cross-section cell, oscillations of the flow orientation around a corner lead to container shape oscillations in the LSC reference frame, and thus a path length oscillation of the LSC.
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