Fri July 1st 2016
14:00 – 15:00
ZH286
Seminar Decoding Physics of Convective Turbulence
Mahendra K. Verma

Details:

In this talk we present the present status of the turbulence phenomenology of turbulent thermal convection. Using pseudospectral simulations of turbulent thermal convection at very high resolution (4096^3) and high Rayleigh number (1.1 × 10^11) with unit Prandtl number. We conclude that convective turbulence exhibits behaviour similar to fluid turbulence, that is, Kolmogorov’s k^−5/3 spectrum with forward and local energy transfers, along with a nearly isotropic energy distribution. The energy transfer diagnostics have provided a very useful diagnostics to this question.

We also compute the rms values of various terms of the momentum equation of turbulent convection. We show that the acceleration of a fluid parcel is provided mainly by the pressure gradient, and the buoyancy and dissipation term are quite close to each other. Thus, the effect of buoyancy is annulled in convective turbulence, leading to Kolmogorov’s theory of turbulence.
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The 10th Complex Motion in Fluids 2020
Max Planck Gesellschaft
MCEC
Twente
Centre for Scientific Computing
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