This paper presents results of a computational study conducted to assess the multiscale resolution capabilities and limitations of different Detached Eddy Simulation (DES) multiscale turbulence models in unsteady flow predictions for internal axial flow in a single rod channel configuration. Two different DES models are compared in the present analysis. The DES models are based on the Spalart-Allmaras (S-A) one-equation model and the two-equation realizable k-ε model. A detailed assessment of the DES turbulence model coefficient for the S-A based DES model is presented. The predicted time-averaged mean velocity and turbulent stresses are compared with the available experimental results. Flow unsteadiness, which is important for determining heat, momentum, and mass transfer in the gap region, is presented through time histories and spectra of flow quantities. The unsteady spectra for the velocity fluctuations are also compared with the experimental observations. The results demonstrate that the DES turbulence model coefficient significantly influence the predicted solution. The realizable k-ε-model-based DES model is found to be numerically more stable than the one-equation S-A-based DES model. Predicted results demonstrate that the modifications need to be incorporated in the current DES model formulations for proper prediction of wall bounded internal turbulent flows.
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16th International Conference on Nuclear Engineering
May 11–15, 2008
Orlando, Florida, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-4815-9
PROCEEDINGS PAPER
Assessment of DES Multiscale Turbulence Models for Prediction of Flow and Heat Transfer in an Axial-Channel Rod Configuration
Debashis Basu,
Debashis Basu
Southwest Research Institute®, San Antonio, TX
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Kaushik Das,
Kaushik Das
Southwest Research Institute®, San Antonio, TX
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Scott L. Painter,
Scott L. Painter
Southwest Research Institute®, San Antonio, TX
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Lane D. Howard,
Lane D. Howard
Southwest Research Institute®, San Antonio, TX
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Steven T. Green
Steven T. Green
Southwest Research Institute®, San Antonio, TX
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Debashis Basu
Southwest Research Institute®, San Antonio, TX
Kaushik Das
Southwest Research Institute®, San Antonio, TX
Scott L. Painter
Southwest Research Institute®, San Antonio, TX
Lane D. Howard
Southwest Research Institute®, San Antonio, TX
Steven T. Green
Southwest Research Institute®, San Antonio, TX
Paper No:
ICONE16-48515, pp. 425-438; 14 pages
Published Online:
June 24, 2009
Citation
Basu, D, Das, K, Painter, SL, Howard, LD, & Green, ST. "Assessment of DES Multiscale Turbulence Models for Prediction of Flow and Heat Transfer in an Axial-Channel Rod Configuration." Proceedings of the 16th International Conference on Nuclear Engineering. Volume 2: Fuel Cycle and High Level Waste Management; Computational Fluid Dynamics, Neutronics Methods and Coupled Codes; Student Paper Competition. Orlando, Florida, USA. May 11–15, 2008. pp. 425-438. ASME. https://doi.org/10.1115/ICONE16-48515
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