Plume structures in the hard-turbulent regime of three-dimensional infinite Prandtl number convection

Details Plume structures in the hard-turbulent regime of three-dimensional infinite Prandtl number convection Plume structures in the hard-turbulent regime of three-dimensional infinite Prandtl number convection

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..383m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 5, p. 383-386.

Physics

23

Computerized Simulation, Convective Heat Transfer, Rayleigh Number, Three Dimensional Models, Turbulent Flow, Boundary Conditions, Power Spectra, Prandtl Number, Temperature Distribution, Thermal Boundary Layer

Scientific paper

Numerical simulations of three-dimensional infinite Prandtl number thermal convection with Rayleigh number (Ra) up to 10 exp 8 are reported. Convection with Ra higher than 10 exp 7 is characterized by the appearance of disconnected thermal plumes. The smaller plumes are detached by the currents produced by the larger plumes. The low wavenumber portion of a thermal power spectrum near the boundary layer becomes flat at high Ra, while the spectrum measured in the interior shows a positive slope for low wavenumbers. Differences are found in the thermal spectra between 2D and 3D models.

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