Numerical Calculations of Two-Dimensional Large Prandtl Number Convection in a Box
J. Fluid Mech. (2013), vol. 729, pp. 584–602. c Cambridge University Press 2013 584 doi:10.1017/jfm.2013.330 Numerical calculations of two-dimensional large Prandtl number convection in a box J. A. Whitehead1,†, A. Cotel2, S. Hart3, C. Lithgow-Bertelloni4 and W. Newsome5 1Physical Oceanography Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA 2Civil and Environmental Engineering Department, University of Michigan, 1351 Beal Avenue, Ann Arbor, MI 48109, USA 3Geology and Geophysics Department, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA 4Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK 5Geological Sciences Department, University of Michigan, 1100 North University Avenue, Ann Arbor, MI 48109, USA (Received 30 August 2012; revised 17 June 2013; accepted 22 June 2013; first published online 24 July 2013) Convection from an isolated heat source in a chamber has been previously studied numerically, experimentally and analytically. These have not covered long time spans for wide ranges of Rayleigh number Ra and Prandtl number Pr. Numerical calculations of constant viscosity convection partially fill the gap in the ranges Ra 103–106 and Pr 1; 10; 100; 1000 and . Calculations begin with cold fluid everywhereD and localizedD hot temperature at1 the centre of the bottom of a square two-dimensional chamber. For Ra > 20 000, temperature increases above the hot bottom and forms a rising plume head. The head has small internal recirculation and minor outward conduction of heat during ascent. The head approaches the top, flattens, splits and the two remnants are swept to the sidewalls and diffused away.
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