Phase dynamics of convective rolls

Evidence of convective rolls in a sunspot penumbra

Aims. We study the recently discovered twisting motion of bright penumbral filaments with the aim of constraining their geometry and the associated magnetic field. Methods. A large sunspot located 40 from disk center was observed at high resolution with the 1-m Swedish Solar Telescope. Inversions of multi-wavelength polarimetric data and speckle reconstructed time series of continuum images wer...

Convective rolls and hydrothermal waves in evaporating sessile drops.

Recent experiments on the evaporation of sessile droplets have revealed the spontaneous formation of various patterns including the presence of hydrothermal waves. These waves had previously been observed, in the absence of evaporation, in thin liquid layers subjected to an imposed, uniform temperature gradient. This is in contrast to the evaporating droplet case wherein these gradients arise n...

Amplitude equations for Rayleigh-Bénard convective rolls far from threshold.

An extension of the amplitude method is proposed. An iterative algorithm is developed to build an amplitude equation model that is shown to provide precise quantitative results even far from the linear instability threshold. The method is applied to the study of stationary Rayleigh-Bénard thermoconvective rolls in the nonlinear regime. In particular, the generation of second and third spatial h...

Pinching instability of convective rolls in an anisotropic fluid : first step to chaos

Numerical Simulation and Analysis of Horizontal Convective Rolls and Their Potential Impact on 03 May 1999

A three-dimensional, high-resolution model is employed to investigate the conditions prior to the 03 May 1999 tornado outbreak in order to ascertain if conditions were favorable for the formation of horizontal convective rolls. Horizontal convective rolls (HCRs) are an overlooked meteorological phenomena that may have significant implications on storm initiations in environments from which they...