scholarly journals NUMERICAL EXPERIMENTS OF THERMAL CONVECTION IN A ROOM WITH NATURAL VENTILATION BY LARGE EDDY SIMULATION AND ITS MODEL TESTS

1987 ◽  
Vol 376 (0) ◽  
pp. 19-28
Author(s):  
JUN-ICHIRO TSUTSUMI ◽  
YOSHIMI URANO ◽  
MASARU NISHIDA
Keyword(s):  
Large Eddy Simulation ◽  
Thermal Convection ◽  
Numerical Experiments ◽  
Natural Ventilation ◽  
Model Tests ◽  
Eddy Simulation ◽  
Large Eddy

New dynamic subgrid-scale heat flux models for large-eddy simulation of thermal convection based on the general gradient diffusion hypothesis

2008 ◽  
Vol 604 ◽  
pp. 125-163 ◽  
Author(s):  
BING-CHEN WANG ◽  
EUGENE YEE ◽  
DONALD J. BERGSTROM ◽  
OAKI IIDA
Keyword(s):  
Heat Flux ◽  
Thermal Diffusivity ◽  
Temperature Gradient ◽  
Large Eddy Simulation ◽  
Thermal Convection ◽  
Subgrid Scale ◽  
Eddy Simulation ◽  
Special Cases ◽  
Large Eddy ◽  
New Models

Three new dynamic tensor thermal diffusivity subgrid-scale (SGS) heat flux (HF) models are proposed for large-eddy simulation of thermal convection. The constitutive relations for the proposed modelling approaches represent the most general explicit algebraic formulations possible for the family of SGS HF models constructed using the resolved temperature gradient and SGS stress tensor. As a result, these three new models include a number of previously proposed dynamic SGS HF models as special cases. In contrast to the classical dynamic eddy thermal diffusivity SGS HF model, which strictly requires the SGS heat flux be aligned with the negative of the resolved temperature gradient, the three new models proposed here admit more degrees of freedom, and consequently provide a more realistic geometrical and physical representation of the SGS HF vector. To validate the proposed models, numerical simulations have been performed based on two benchmark test cases of neutrally and unstably stratified horizontal channel flows.

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