Abstract Three-dimensional buoyancy driven flows in vertical cylinders are simulated with a finite difference technique. Asymmetric convective flows are studied for three values of the (length-to-radius) aspect ratio A. One result concerns the occurrence of asymmetric convection in a flat A=0.485 cylinder for Pr=6.7, near the threshold and up to 3Ra c (where Ra c is the critical Rayleigh number and Pr is the Prandtl number). Complex (steady and time-dependent) supercritical regimes have been simulated in cylinders of aspect ratios A=2 and A=4 for Pr=0.02 and in ranges of Ra up to 8Ra c and 6Ra c, respectively. The flow patterns are analysed graphically and discussed with respect to a weakly nonlinear analysis and to experiments. In a particular case, A=4 and Pr=0.02, an oscillatory motion has been obtained and some features of the flow pattern are shown during a period.
Steady and oscillatory convection in vertical cylinders heated from below. Numerical simulation of asymmetric flow regimes
Advances in Space Research ; 8 , 12 ; 281-292
1989-01-01
12 pages
Article (Journal)
Electronic Resource
English
Numerical Simulation of Thermocapillary Oscillatory Convection
Online Contents | 1993
|Numerical simulation of thermocapillary oscillatory convection
Elsevier | 1993
|