The present paper describes new experimental data of thermal mixing in a T-junction compared with results from Large-Eddy Simulations (LES) and Detached Eddy Simulations (DES). The experimental setup was designed in order to provide data suitable for validation of CFD-calculations. The data is obtained from temperature measurements with thermocouples located near the pipe wall, velocity measurements with Laser Doppler Velocimetry (LDV) as well as single-point concentration measurements with Laser Induced Fluorescence (LIF). The LES showed good agreement with the experimental data also when fairly coarse computational meshes were used. However, grid refinement studies revealed a fairly strong sensitivity to the grid resolution, and a simulation using a fine mesh with nearly 10 million cells significantly improved the results in the entire flow domain. The sensitivity to different unsteady inlet boundary conditions was however small, which shows that the strong large-scale instabilities that are present in the mixing region are triggered independent of the applied inlet perturbations. A shortcoming in the performed simulations is insufficient near-wall resolution, which resulted in poor predictions of the near-wall mean velocity profiles and the wall-shear stress. Simulations using DES improved the near-wall velocity predictions, but failed to predict the temperature fluctuations due to high levels of modeled turbulent viscosity that restrained the formation of small scale turbulence.
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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
High-Cycle Thermal Fatigue in Mixing Tees: Large-Eddy Simulations Compared to a New Validation Experiment
Johan Westin,
Johan Westin
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
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Pascal Veber,
Pascal Veber
Onsala Ingenjo¨rsbyra˚ AB, Kungsbacka, Sweden
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Lars Andersson,
Lars Andersson
Onsala Ingenjo¨rsbyra˚ AB, Kungsbacka, Sweden
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Carsten ’t Mannetje,
Carsten ’t Mannetje
Forsmarks Kraftgrupp AB, O¨sthammar, Sweden
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Urban Andersson,
Urban Andersson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
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Jan Eriksson,
Jan Eriksson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
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Mats E. Henriksson,
Mats E. Henriksson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
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Farid Alavyoon,
Farid Alavyoon
Forsmarks Kraftgrupp AB, O¨sthammar, Sweden
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Claes Andersson
Claes Andersson
Ringhals AB, Va¨ro¨backa, Sweden
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Johan Westin
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
Pascal Veber
Onsala Ingenjo¨rsbyra˚ AB, Kungsbacka, Sweden
Lars Andersson
Onsala Ingenjo¨rsbyra˚ AB, Kungsbacka, Sweden
Carsten ’t Mannetje
Forsmarks Kraftgrupp AB, O¨sthammar, Sweden
Urban Andersson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
Jan Eriksson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
Mats E. Henriksson
Vattenfall Research and Development AB, A¨lvkarleby, Sweden
Farid Alavyoon
Forsmarks Kraftgrupp AB, O¨sthammar, Sweden
Claes Andersson
Ringhals AB, Va¨ro¨backa, Sweden
Paper No:
ICONE16-48731, pp. 515-525; 11 pages
Published Online:
June 24, 2009
Citation
Westin, J, Veber, P, Andersson, L, ’t Mannetje, C, Andersson, U, Eriksson, J, Henriksson, ME, Alavyoon, F, & Andersson, C. "High-Cycle Thermal Fatigue in Mixing Tees: Large-Eddy Simulations Compared to a New Validation Experiment." 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. 515-525. ASME. https://doi.org/10.1115/ICONE16-48731
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