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|Title:||Rapidly sheared homogeneous MHD turbulence in a rotating frame||Authors:||Akylas, Evangelos
Kassinos, Stavros C.
|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||URI:||https://ktisis.cut.ac.cy/handle/10488/14233||Type:||Conference Papers|
|Appears in Collections:||Δημοσιεύσεις σε συνέδρια/Conference papers|
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