Stability transitions and turbulence in horizontal convection
Bishakhdatta Gayen, Ross W Griffiths, Graham O Hughes
JOURNAL OF FLUID MECHANICS | CAMBRIDGE UNIV PRESS | Published : 2014
Recent results have shown that convection forced by a temperature gradient along one horizontal boundary of a rectangular domain at a large Rayleigh number can be turbulent in parts of the flow field. However, the conditions for onset of turbulence, the dependence of flow and heat transport on Rayleigh number, and the roles of large and small scales in the flow, have not been established. We use three-dimensional direct numerical simulation (DNS) and large-eddy simulation (LES) over a wide range of Rayleigh numbers, Ra ~ 10 8-1015, for Prandtl number Pr = 5 and a small aspect ratio, and show that a sequence of several stability transitions at Ra ~ 10 10 - 1011 defines a change from laminar t..View full abstract
Awarded by Australian Research Council
Awarded by ARC Future Fellowship
Computations were carried out using the Australian National Computational Infrastructure, through the National Computational Merit Allocation Scheme supported by the Australian Government. This work was supported by Australian Research Council grants DP1094542 and DP120102744. G.O.H. was supported by ARC Future Fellowship FT100100869.