Les of Turbulent Thermal Convection
- 324 Downloads
We describe results obtained from Large Eddy Simulations (LES) of turbulent natural convection flow in an infinite horizontal fluid layer heated from below. We use a dynamic subgrid scale model in scaling formulation, and discuss an anisotropic modification of it. The largest Rayleigh number successfully simulated is 108 with an aspect ratio of 7. Average properties of the resulting flow are computed and compared with DNS data in the literature. An a priori test is done, that allows us to compare the models. The probability distribution functions of temperature fluctuations at different Rayleigh numbers are compared. Finally, flow structures at largest simulated Rayleigh number are investigated.
KeywordsNusselt Number Rayleigh Number Large Eddy Simulation Direct Numerical Simulation Thermal Boundary Layer
Unable to display preview. Download preview PDF.
- Abbà, A., Bucci, R., Cercignani, C., & Valdettaxo, L., 1995a: New variants to the dynamic subgrid scale model and new non reflecting outlet boundary conditions in channels and annuli. In Proceedings of the Workshop on small-scale structures in three-dimensional hydro and magnetohydrodynamic turbulence, Nice. Springer-Verlag.Google Scholar
- Abbà, A., Bucci, R., Cercignani, C., & Valdettaxo, L., 1995b: A new approach to the dynamic subgrid scale model. Submitted for publication.Google Scholar