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۱A Study of the Asymptotic Equilibrium Behavior in Stratified Turbulence Submitted to Horizontal Shear
اطلاعات انتشار: Journal Of Applied Fluid Mechanics، هفتم،شماره۳، ۲۰۱۴، سال
تعداد صفحات: ۱۳
In this work, the asymptotic equilibrium behaviour of dimensionless parameters in stably stratified turbulence submitted to a horizontal shear is studied using two different methods. The first one is an analytic method and is based on linear solutions obtained when non linear effects of pressure and viscosity are neglected. The Laplace Transform is used for integrating differential system. The principal result of this first part of our work is the existence of asymptotic equilibrium states at high shear for all non dimensionless parameters. The second method is a numerical one and is based on a second–order modeling of equations. The Speziale Sarkar and Gatski (SSG) model is retained for pressure–strain correlation and dissipation time evolution equation, whereas, three of the most known second–order models are retained for the scalar field. The principal result of this second part is the big contribution of the SSG models for predicting asymptotic equilibrium states of non dimensional parameters.

۲Obstacle Geometry Effect on the Stability of Two–Dimensional Incompressible Flow in a Channel
نویسنده(ها): ، ، ، ،
اطلاعات انتشار: Journal Of Applied Fluid Mechanics، نهم،شماره۲، ۲۰۱۶، سال
تعداد صفحات: ۹
Two–dimensional incompressible fluid flow around a rectangular shape placed over a larger rectangular shape is analyzed numerically. The vortex shedding is investigated at different arrangements of the two shapes. The calculations are carried out for several values of Reynolds numbers from low values up to 52. At low Reynolds number, the flow remains steady. The flow characteristics are analyzed for each configuration. The analysis of the flow evolution shows that with increasing Re beyond a certain critical value, the flow becomes unstable and undergoes a bifurcation. It is observed that the transition to unsteady regime is performed by a Hopf bifurcation. The critical Reynolds number beyond which the flow becomes unsteady is determined for each configuration.
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