The coexistence of distinctly different patterns in Rayleigh-Bénard slot convection is presented. This state, which occurs at moderate Prandtl number ( P ) and high Rayleigh number ( R ), is characterized by two domains of convection rolls which differ considerably in local wavelength. The onset and behaviour of this state depends on the number of rolls in the slot ( i.e. the average wavelength). One domain always consists of stationary long-wavelength rolls while the other domains consists of small-wavelength rolls which are either oscillating or stationary depending on the average wavelength and R .
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Hegseth et al. (1992) studied this question.
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