A General Dynamic Linear Tensor-Diffusivity Subgrid-Scale Heat Flux Model for Large-Eddy Simulation of Turbulent Thermal Flows

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Authors
  1. Wang, B-.C.
  2. Yin, J.
  3. Yee, E.
  4. Bergstrom, D.J.
Corporate Authors
Defence R&D Canada - Suffield, Ralston ALTA (CAN);Saskatchewan Univ, Saskatoon SASK (CAN) Dept of Mechanical Engineering
Abstract
In this article, a general dynamic linear tensor diffusivity model is proposed for representing the subgid-scale (SGS) heat flux (HF). The tensor diffusivity for the model is an inhomogeneous linear function of the resolved strain and rotation rate tensors, and includes three conventional dynamic SGS HF modeling approaches as special cases. In contrast to the dynamic SGS eddy diffusivity modeling approach, the proposed model admits more degrees of freedom for representing the SGS thermal diffusivity, allows for nonalignment between the SGS HF and resolved temperature gradient, and consequently provides a more realistic geometric representation of the SGS heat flux. To validate the proposed modeling approach, numerical simulations have been performed based on a combined forced- and natural-convention flow in a vertical channel with a Reynolds number Reτa=150 and a Grashof number Gr=9.6x105. In comparison with the reported direct numerical simulation data and the results obtained using the conventional dynamic SGS eddy diffusivity model, it is shown that the proposed model is able to provide good predictions of various flow quantities at the resolved scale and, more important, offer new insights into near-wall flow physics at the subgrid scale.
Report Number
DRDC-SUFFIELD-SL-2006-172 — Scientific Literature
Date of publication
01 May 2007
Number of Pages
23
Reprinted from
Numerical Heat Transfer, Part B, 2007, p. 205-227
DSTKIM No
CA029341
CANDIS No
527603
Format(s):
Hardcopy;Document Image stored on Optical Disk

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