Rough surfaces have been widely used as an efficient way to enhance the heat-transfer
efficiency in turbulent thermal convection. In this paper, however, we show that roughness …

In thermal convection, roughness is often used as a means to enhance heat transport,
expressed in Nusselt number. Yet there is no consensus on whether the Nusselt vs Rayleigh …

The absorption of light or radiation drives turbulent convection inside stars, supernovae,
frozen lakes, and Earth's mantle. In these contexts, the goal of laboratory and numerical …

We use highly resolved numerical simulations to study turbulent Rayleigh-Bénard
convection in a cell with sinusoidally rough upper and lower surfaces in two dimensions for …

In turbulent Rayleigh–Bénard (RB) convection with regular, mono-scale, surface roughness,
the scaling exponent, when the smaller roughness elements fully protrude through the …

We present a systematic investigation of the effects of roughness geometry on turbulent
Rayleigh–Bénard convection (RBC) over rough plates with pyramid-shaped and periodically …

We report an experimental study about the effect of an obstructed centre on heat transport
and flow reversal by inserting an adiabatic cylinder at the centre of a quasi-two-dimensional …

The Pr-dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard
convection Page 1 J. Fluid Mech. (2021), vol. 911, A52, doi:10.1017/jfm.2020.1091 The Pr-dependence …

External modulation on thermal convection has been studied extensively to achieve the
control of flow structures and heat-transfer efficiency. In this paper, we carry out direct …

We study, using direct numerical simulations, the effect of geometrical confinement on heat
transport and flow structure in Rayleigh-Bénard convection in fluids with different Prandtl …