Bolgiano-Obukhov spectrum and mixing efficiency in stably stratified turbulence
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Published on: June 12, 2015
Shadab Alam1, Mahendra K Verma2, Pranav Joshi1
1Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India.
Abstract:
In this paper, using a shell model, we simulate highly turbulent stably stratified flow for weak to moderate stratification at unitary Prandtl number. We investigate the energy spectra and fluxes of velocity and density fields. We observe that for moderate stratification, in the inertial range, the kinetic energy spectrum E_{u}(k) and the potential energy spectrum E_{b}(k) show dual scaling-Bolgiano-Obukhov scaling [E_{u}(k)∼k^{-11/5} and E_{b}(k)∼k^{-7/5}] for k
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