Modeling of Indoor Thermally Stratified Flows on the Basis of Eddy Viscosity/Diffusivity Model: State of the Art Review
Gao, J., Zhao, J.N., Gao, F.S., Zhang, X.
2009
Journal of Building Physics, Vol. 32, No. 3, 221-241 (2009)
indoor air flow ? thermal stratification ? turbulence ? indoor environment.
Gao, J., Zhao, J.N., Gao, F.S., Zhang, X., (2009), "Modeling of Indoor Thermally Stratified Flows on the Basis of Eddy Viscosity/Diffusivity Model: State of the Art Review", Journal of Building Physics, Vol. 32, No. 3, 221-241 (2009).
| Abstract: |
| Modeling of indoor air flow is one subject of significance in the area of building physics. As a multidisciplinary issue, the physics of air flow has been insufficiently investigated, especially for the thermally stratified flows that is widely encountered in indoor environment, and for the perimeter zones where exterior environment contributes much to the indoor thermal environment through envelops. This article tries to do an extensive survey about how to model thermally stratified flows within the RANS framework based on a literature review. First, turbulence phenomenon with the indoor thermally stratified flow is briefly interpreted. Second, the nonisotropic modification of Reynolds stress and heat flux is analyzed and the direct vertical correction is suggested to keep the simplicity of traditional EVM/EDM. Finally, a simpler nonisotropic correction is discussed, which adapts turbulent diffusion to the attenuated turbulence through modifying the isotropic turbulent viscosity and/or turbulent Prandtl number. This study, based on a limited but in-depth literature review, intends to sum up some useful suggestion on the modeling of indoor thermally stratified flows on the principles of simplicity and reliability. The motivation and objective of the present work is to achieve some fundamental guidelines for the evaluation of existing models and the exploration of new models. |
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