Numerical simulation of the dynamics of non-zero buoyancy turbulent mixing zone in a linearly stratified medium
N.P. Moshkin1,2, A.V. Fomina3, G.G. Chernykh4,2
1Lavrentyev Institute of Hydrodynamics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3Kuzbass Humanitarian Pedagogical Institute KSU, Novokuznetsk, Russia
4Federal Research Center for Information and Computational Technologies, Novosibirsk, Russia
Keywords: zone of turbulent mixing of non-zero buoyancy, linearly stratified medium, semi-empirical models of turbulence, numerical modelling
Abstract
A numerical model of the dynamics of a flat localized region of turbulent perturbations of non-zero buoyancy in a linearly stratified medium has been developed on the basis of the mathematical model, including differential equations for Reynolds stresses transfer and algebraic model of a vector of turbulent scalar flux. The evolution of a heated turbulent spot has been considered. The non-zero buoyancy is the reason of an increase in the geometrical size of the turbulent spot and generation of internal waves of greater amplitude. The generation of the total energy of turbulence is insignificant even in the case when the initial potential energy of a turbulent spot of non-zero buoyancy is comparable to the initial total energy of turbulence in it.
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