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Higher harmonic resonance of two-dimensional disturbances in Rayleigh- Bénard convection. (English) Zbl 0744.76053
Summary: A higher harmonic resonance with wavenumber ratio of 1:3 is found to take place in Rayleigh-Bénard convection under rigid-rigid boundary conditions. Bifurcation diagrams for two-dimensional motion are obtained for various values of the Prandtl number $P$. It is found that a pure mode and mixed mode solutions exist as nonlinear equilibrium states of primary roll solutions for relatively high-Prandtl-number fluids $(P\geq 0.13)$ while the pure mode, mixed modes, travelling wave and modulated wave solutions exist for relatively low-Prandtl-number fluids $(P\leq0.12)$.

76E15Convective instability (fluid mechanics)
76R10Free convection (fluid mechanics)
76E30Nonlinear effects (fluid mechanics)
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