Suscripción a Biblioteca: Guest
Sixth International Symposium on Turbulence and Shear Flow Phenomena
June, 22-24, 2009 , Seoul National University, Seoul, Korea

DOI: 10.1615/TSFP6

HOMOGENEOUS TURBULENCE WITH BAROCLINIC INSTABILITY: LINEAR THEORY AND SIMULATIONS

pages 1269-1274
DOI: 10.1615/TSFP6.2020
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SINOPSIS

The coupled effects of mean shear, density-stratification and system rotation are investigated in the context of strong turbulence, i.e. accounting for the baroclinic instability. Although there exists a large literature in the rotating shear case (e.g. [6]) and the stratified shear case, with linear approaches, Direct or Large Eddy Simulations, very few studies consider the combined three distortions.
First, one has to define an admissible flow condition for including all three effects, in order to be able to treat properly the homogeneity condition in the numerical simulations. Then, we solve numerically the complete nonlinear equations for the rotating stratified shear homogeneous turbulent flow, using a pseudo-spectral method. The most relevant parameters for these Direct Numerical Simulations (DNS) are chosen from a preliminary comprehensive parametric study that includes two simplified approaches: (a) Rapid Distortion Theory (RDT) with the related stability analysis technique; (b) a simplified "pressureless" stability analysis.

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