XXI ICTAM, 15–21 August 2004, Warsaw, Poland LARGE EDDY SIMULATION OF RAYLEIGH-BÉNARD CONVECTION IN AN INFINITE FLUID LAYER
نویسندگان
چکیده
A numerical study of Rayleigh-Benard convection in an infinite fluid layer (Pr=0.71) is performed using large eddy simulation (LES) of the Navier-Stokes equations with the Boussinesq approximation. We present results in the ’hard turbulence’ regime (2.10 < Ra < 2.10). The LES modelling uses the mixed scale diffusivity model, that we have originally developed in the case of the differentially heated cavity. The main observation is the ability of the computations to reproduce the 2/7 scaling behavior over a large Ra range (2.10 < Ra < 2.10). Moreover the regime transition towards the ’ultra-hard regime’ is observed at Ra = 2.10.
منابع مشابه
XXI ICTAM, 15–21 August 2004, Warsaw, Poland NONLINEAR CONVECTIVE PATTERNS IN SPHERICAL RAYLEIGH-BÉNARD SYSTEMS
Nonlinear thermal convection in a spherical fluid layer in the presence of spherically symmetric gravity, spherical RayleighBénard convection, is investigated. At the onset of spherical Rayleigh-Bénard convection, there exists the (2l+1)-fold degeneracy of the linear solution, where l is the degree of a spherical harmonics. Nonlinear convection is studied through fully three-dimensional numeric...
متن کاملXXI ICTAM, 15-21 August 2004, Warsaw, Poland AHP SETUP FOR LOW LAMINAR MELT FLOW STUDY IN CRYSTAL GROWTH
For verification of numeric methods and development of experimental benchmarks for 2D and 3D models of heat and mass transfer in crystal growth, the experimental AHP setup based on a novel AHP crystal growth method is designed to conduct experiments with NaNO3 and ice. It is equipped with PIV and PVT visualizations systems to provide finding of field of flow velocity and temperature distributio...
متن کاملXXI ICTAM, 15-21 August 2004, Warsaw, Poland SIMULATION OF CONTACTING SPATIAL POLYHEDRAL PARTICLES
In the following, the collective dynamical behaviour of many convex and non-convex polyhedral bodies in space is described. To be able to simulate a high number of bodies, methods from Molecular Dynamics (MD) are frequently used. Here these methods are combined with collision detection methods and contact formulations adopted from Multibody Systems (MBS). The used methods are presented briefly ...
متن کاملXXI ICTAM, 15–21 August 2004, Warsaw, Poland ATTRACTOR AND PATTERN CONTROL IN NONLINEAR MEDIA BY LOCALIZED DEFECTS
We consider pattern and attractor control in nonlinear dissipative systems. We develop an analytic approach to attractor control for neural, genetic networks systems of coupled oscillators and spatially extended systems. In particular, we apply this method for some systems of Ginzburg-Landau’s type and others.
متن کاملXXI ICTAM, 15–21 August 2004, Warsaw, Poland COMPUTATIONAL MODEL OF SELECTED TRANSPORT PROCESSES IN AN INFANT INCUBATOR
The major objective of this study was, using the modern numerical techniques, to investigate transport processes of heat and mass transfer within an infant incubator, were the premature newborn baby is nursed. This investigation consists of calculations of the air flow inside the incubator, including coupled heat transfer due to heat conduction, convection, thermal radiation and evaporation. Ob...
متن کامل