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Title: Rapidly sheared homogeneous MHD turbulence in a rotating frame
Authors: Akylas, Evangelos 
Kassinos, Stavros C. 
Gravanis, Elias 
Keywords: Turbulence models;Turbulence;Turbulent heat
Category: Civil Engineering
Field: Engineering and Technology
Issue Date: 28-Jul-2011
Source: 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011, Ottawa Convention CentreOttawa, Canada, 28 July 2011 through 31 July 2011
Conference: International Symposium on Turbulence and Shear Flow Phenomena 
Abstract: © 2011 International Symposium on Turbulence and Shear Flow Phenomena, TSFP07. All rights reserved. Rapid distortion theory is applied to magneto-hydrodynamic turbulence that is sheared in a rotating frame. We describe analytically the modification of the three-dimensional velocity spectra due to the presence of an external magnetic field, using the quasi-static approximation. Using this analytical solution, we investigate the effect of the frame rotation in the evolution of one-point statistics, under the linear theory. For initial fields that are two-dimensional (but three-componential), with the axis of independence aligned with the flow direction, we derive analytically one-point statistics, such as the Reynolds stresses and the structure dimensionality tensor in physical space. The analytical results are compared with the linear three-dimensional exact numerical solution for initially isotropic homogeneous turbulence, and they show remarkable agreement. They describe accurately the tendencies in the morphology of the turbulent structures that develop as a result of the two competitive mechanisms of the frame rotation and the Joule dissipation. These results are in qualitative agreement with existing non-linear DNS results.
Description: 7th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2011 Volume 2011-July, 2011
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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