Turbulent Solar Convection and Its Coupling with Rotation: The Effect of Prandtl Number and Thermal Boundary Conditions on the Resulting Differential Rotation

2000 ◽  
Vol 533 (1) ◽  
pp. 546-556 ◽  
Author(s):  
J. R. Elliott ◽  
M. S. Miesch ◽  
J. Toomre
Keyword(s):  
Prandtl Number ◽  
Boundary Conditions ◽  
Differential Rotation ◽  
Solar Convection ◽  
Thermal Boundary Conditions

Subgrid-Scale Diffusivity: Wall Behavior and Dynamic Methods

2004 ◽  
Vol 73 (3) ◽  
pp. 360-367 ◽  
Author(s):  
Guillaume Brillant ◽  
Sabine Husson ◽  
Françoise Bataille
Keyword(s):  
Prandtl Number ◽  
Boundary Conditions ◽  
Turbulent Channel Flow ◽  
Constant Heat Flux ◽  
Large Eddy Simulations ◽  
Subgrid Scale ◽  
Adiabatic Wall ◽  
Thermal Boundary Conditions ◽  
Dynamic Methods ◽  
Large Eddy

This study concerns the near-wall behavior of the subgrid-scale diffusivity. This is shown to depend on the thermal boundary conditions. Therefore, the constant subgrid-scale Prandtl number hypothesis is questionable and a direct modeling of the subgrid-scale diffusivity is considered instead. Large-eddy simulations are carried out using the Trio U code in a turbulent channel flow configuration with the three classical thermal boundary conditions (constant temperature, constant heat flux, and adiabatic wall). Different dynamic methods are used to model the subgrid-scale diffusivity and results are compared with constant subgrid-scale Prandtl number large-eddy simulations and with direct numerical simulations.

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