Investigation of coherent structures in rotating Rayleigh-Benard convection
| Autor: | Afzal Husain, MF Baig, Hirdesh Varshney |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Mechanical Engineering Prandtl number Computational Mechanics Rayleigh number Mechanics Condensed Matter Physics Rotating reference frame Physics::Fluid Dynamics symbols.namesake Classical mechanics Mechanics of Materials symbols Rayleigh scattering Boussinesq approximation (water waves) Navier–Stokes equations Rayleigh–Bénard convection Large eddy simulation |
| Zdroj: | Physics of Fluids. 18:125105 |
| ISSN: | 1089-7666 1070-6631 |
| Popis: | The current work involves identification of coherent structures in rotating turbulent Rayleigh-Benard convection (RBC) in a moderately large aspect-ratio (8:8:1) rectangular enclosure. The enclosure is rotating about a vertical axis passing through its center of gravity. The incompressible Navier-Stokes and energy equations are solved in a rotating frame of reference and the resulting velocity and thermal fields are analyzed to educe coherent structures. The flow structures have been investigated at different nondimensional rotation rates ranging from ω=0 to 104 for a fixed Rayleigh number Ra=107 and Prandtl number Pr=0.01, keeping the Raw∕Ta ratio constant at 10−3 in order to stringently maintain Boussinesq approximation as well as to attain experimentally realizable rotational Rayleigh numbers. Coherent structures in the flow domain have been sought using different identification techniques, namely large eddy simulation (LES) decomposition using top-hat filter, proper orthogonal decomposition (POD) cons... |
| Databáze: | OpenAIRE |
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