Inhibition of phase turbulence close to onset of convection by permeable lateral boundary condition for the mean flow

Abstract : We show that the mechanisms which govern the onset of time dependence in usual Rayleigh-Bénard convection at low Prandtl number may be inhibited by a suitable choice of the lateral boundary condition for the sole mean flow. We first build a boundary condition which behaves like a rigid one for the roll flow and like a permeable one for the mean flow. We then observe that phase turbulence is inhibited close to the onset of convection. We understand this effect by solving the mean-flow field from the Cross-Newell equations. Our experimental result together with its interpretation demonstrates indirectly the existence of mean flows and enlightens the ways by which mean flows destabilize patterns.
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F. Daviaud, A Pocheau. Inhibition of phase turbulence close to onset of convection by permeable lateral boundary condition for the mean flow. Europhys. Lett, 1989, 9 (7), pp.675-680. ⟨cea-01374041⟩

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