The flow development and behaviour of a fluid in a twodimensionalcavity, heated and cooled periodically from onesidewall, with all other walls adiabatic, is investigated via numericalsimulation. The heating and cooling on the sidewallproduce alternating direction vertical natural convection boundarylayers that entrain fluid from the cavity interior and dischargeit at the top and bottom of the cavity. At start up andduring a transition phase the heat content of the cavity, which isbiased by the initial heating phase, has a non-zero mean. At fulldevelopment the flow is quasi steady with the natural convectionboundary layers maintaining a stable stratification in thecavity interior and the heat content oscillating around a zeromean value. The stratification strength is shown to be stronglydependent on the forcing frequency.
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