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- W2005156653 abstract "Nonlinear (non-Boussinesq) variations in fluid's density, viscosity, and thermal conductivity caused by a large temperature gradient in a flow domain lead to a wide variety of instability phenomena in mixed convection channel flow of a simple gas such as air. It is known that in strongly nonisothermal flows, the instabilities and the resulting flow patterns are caused by competing buoyancy and shear effects [see S. A. Suslov and S. Paolucci, J. Fluid Mech. 302, 91 (1995)]. However, as is the case in the Boussinesq limit of small temperature gradients, in moderately non-Boussinesq regimes, only a shear instability mechanism is active. Yet in contrast to Boussinesq flows, multiple instability modes are still detected. By reducing the system of full governing Navier-Stokes equations to a dynamical system of coupled Landau-type disturbance amplitude equations we compute a comprehensive parametric map of various shear-driven instabilities observed in a representative moderately non-Boussinesq regime. Subsequently, we analyze nonlinear interaction of unstable modes and reveal physical reasons for their appearance." @default.
- W2005156653 created "2016-06-24" @default.
- W2005156653 creator A5057256056 @default.
- W2005156653 date "2010-02-01" @default.
- W2005156653 modified "2023-09-26" @default.
- W2005156653 title "Mechanism of nonlinear flow pattern selection in moderately non-Boussinesq mixed convection" @default.
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- W2005156653 doi "https://doi.org/10.1103/physreve.81.026301" @default.
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