Oscillatory Rayleigh-Marangoni convection in a layer heated from above: numerical simulations with an undeformable free surface.
Joint action of buoyancy and thermocapillary forces can destabilize the motionless state in a liquid layer heated from above due to the coupling of internal and surface waves. The nonlinear evolution of this oscillatory instability is studied using three-dimensional direct numerical simulations with a pseudospectral Fourier-Chebyshev code. Alternating rolls and standing, oscillating squares are observed as final convective patterns. The flow is strongly localized near the free surface. Buoyancy plays a negligible role in kinetic energy production.
Boeck
Thomas
T
Laboratoire de Modélisation en Mécanique, Université Pierre et Marie Curie (Paris VI), 8 rue du Capitaine Scott, 75015 Paris, France.
Jurgk
Matthias
M
Bahr
Ute
U