Absolute and Convective Instabilities in Open Shear Flow Layers

Details Absolute and Convective Instabilities in Open Shear Flow Layers Absolute and Convective Instabilities in Open Shear Flow Layers

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003padeu..13...77h&link_type=abstract

In: Contributions to NATO Advanced Research Workshop Turbulence, Waves, and Instabilities in the Solar Plasma; Hungary, 16-20 Se

Astronomy and Astrophysics

Astronomy

Scientific paper

In the present paper we study the absolute and convective nature of instabilities in open shear flows by carrying out fully non-linear adiabatic 2-D hydrodynamic numerical simulations. We found the value of mean flow for which perturbations change from absolute to convective unstable. We fully recover the results of a previous analytic solution. We found that (i) an inviscid incompressible fluid is the most unstable configuration; (b) compressibility and viscosity decrease the value of mean flow necessary for the transition from absolute to convective instability; (c) even a viscosity has dominant influence over compressibility.

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