A comparison of two dynamic subgrid closure methods for turbulent thermal convection
| ISSN: |
1089-7666
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
Two dynamic subgrid-scale (SGS) closure methods for turbulent thermal convection are described. The first method assumes the dissipation rate equals the SGS energy production rate that includes a troublesome buoyancy term, while the second method avoids this complication with a simplifying scale analysis. Tests with large-eddy simulations (LES) of thermal convection reveal that the second method is computationally efficient, and produces results agreeing with direct numerical simulation (DNS) data, as well as values predicted by the inertial subrange theory. Within the LES, the SGS representation is locally and dynamically adjusted to match the statistical structure of the smallest resolvable eddies.
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| Type of Medium: |
Electronic Resource
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| URL: |