An a priori study of subgrid-scale models for the unclosed terms in the energy equation is carried out using the flow field obtained from the direct simulation of homogeneous isotropic turbulence. Scale-similar models involve multiple filtering operations to identify the smallest resolved scales and have been shown to be the most active in the interaction with the unresolved subgrid scales (SGS). In the present study these models are found to give more accurate prediction of the SGS stresses and heat fluxes than eddy-viscosity and eddy-diffusivity models, as well as improve prediction of the SGS turbulent diffusion, SGS viscous dissipation, and SGS viscous diffusion.
|Original language||English (US)|
|Title of host publication||Proceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)|
|Publisher||American Society of Mechanical Engineers|
|Number of pages||1|
|State||Published - Dec 1 1999|