التفاصيل البيبلوغرافية
| العنوان: |
DNS/LES of turbulent flow in a square duct: A priori evaluation of subgrid models. |
| المؤلفون: |
Beig, R., Ehlers, J., Frisch, U., Hepp, K., Jaffe, R. L., Kippenhahn, R., Ojima, I., Weidenmüller, H. A., Wess, J., Zittartz, J., Beiglböck, W., Eisenächer, Monika, Örs, Haluk, Tezel, Akin, Ferziger, Joel H., O'Sullivan, Peter L., Biringen, Sedat, Huser, Asmund |
| المصدر: |
Industrial & Environmental Applications of Direct & Large-Eddy Simulation; 1999, p290-301, 12p |
| مستخلص: |
We have performed a priori tests of two dynamic subgrid-scale (SGS) turbulence models using a highly resolved direct numerical simulation (DNS) data-base for the case of incompressible flow in a straight duct of square cross-section. The model testing is applied only to the homogeneous flow direction where grid filtering can be applied without the introduction of commutation errors. The first model is the dynamic (Smagorinsky/eddy viscosity) SGS model (DSM) developed by Germano et al. [5] while the second is the dynamic two-parameter (mixed) model (DTM) developed by Salvetti and Banerjee [2]. As found in prior studies of this sort there is a very poor correlation of the modelled and exact subgrid-scale dissipation in the case of the DSM. The DSM over-predicts subgrid-scale dissipation on average. Instantaneously, the model provides an inaccurate representation of subgrid-scale dissipation, in general underestimating the magnitude by approximately one order of magnitude. On the other hand, the DTM shows excellent agreement with the exact SGS dissipation over most of the duct cross-section with a correlation coefficient of approximately 0.9. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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