Numerical study of subcritical Rayleigh–Bénard convection rolls in strongly shear-thinning Carreau fluids

2015 ◽  
Vol 219 ◽  
pp. 19-34 ◽  
Author(s):  
Mathieu Jenny ◽  
Emmanuel Plaut ◽  
Antoine Briard
Keyword(s):  
Numerical Study ◽  
Shear Thinning ◽  
Bénard Convection ◽  
Benard Convection ◽  
Convection Rolls ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

scholarly journals From zonal flow to convection rolls in Rayleigh–Bénard convection with free-slip plates

2020 ◽  
Vol 905 ◽  
Author(s):  
Qi Wang ◽  
Kai Leong Chong ◽  
Richard J. A. M. Stevens ◽  
Roberto Verzicco ◽  
Detlef Lohse
Keyword(s):  
Zonal Flow ◽  
Bénard Convection ◽  
Benard Convection ◽  
Convection Rolls ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

Abstract

Numerical Study of Effect of Polymer Additives on Heat Transport in Turbulent Rayleigh- Bénard Convection

2012 ◽  
Vol 472-475 ◽  
pp. 1283-1288 ◽  
Author(s):  
Chen Hui Zheng ◽  
Chang Feng Li ◽  
Hua Hong Jiang
Keyword(s):  
Heat Transport ◽  
Large Scale ◽  
Numerical Study ◽  
Navier Stokes ◽  
Polymer Additive ◽  
Bénard Convection ◽  
Turbulence Regime ◽  
Benard Convection ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

In this study, the Reynolds-Averaged-Navier-Stokes (RANS) model combined with the Cross Viscosity Equation is used, applied to the soft turbulence regime (Ra =5×105~4×107) and hard turbulence regime (Ra>4×107) of Rayleigh-Bénard convection (RBC). The relation curves between heat transport (Nusselt number) and other parameters, as well as flow pattern changes of RBC are obtained for the cases with different Rayleigh number and concentration of the polymer additive. The simulations show that the presence of polymer additive can lead to an enhancement of the heat transfer with larger effect in the hard turbulence regime than those in the soft turbulence regime. It is also shown that in the soft turbulence regime the reversal cycles are shorter than in hard turbulence regime. The symmetric vortices in the diagonal corner of enclosed space shrink and the velocities of large-scale circulation (LSC) increase accordingly.

Sign in / Sign up

Export Citation Format

Share Document