TY - GEN
T1 - Assessment of des multiscale turbulence models for prediction of flow and heat transfer in an axial-channel rod configuration
AU - Basu, Debashis
AU - Das, Kaushik
AU - Painter, Scott L.
AU - Howard, Lane O.
AU - Green, Steven T.
PY - 2008
Y1 - 2008
N2 - 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-c 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-s-model-based DES model is found to be numerically more stable than the one-equation S-Abased 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.
AB - 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-c 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-s-model-based DES model is found to be numerically more stable than the one-equation S-Abased 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.
UR - http://www.scopus.com/inward/record.url?scp=70249087355&partnerID=8YFLogxK
U2 - 10.1115/ICONE16-48515
DO - 10.1115/ICONE16-48515
M3 - Conference contribution
AN - SCOPUS:70249087355
SN - 0791848159
SN - 9780791848159
T3 - International Conference on Nuclear Engineering, Proceedings, ICONE
SP - 425
EP - 438
BT - 2008 Proceedings of the 16th International Conference on Nuclear Engineering, ICONE16
T2 - 16th International Conference on Nuclear Engineering, ICONE16 2008
Y2 - 11 May 2008 through 15 May 2008
ER -