Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle
The crossflow is the key phenomenon in turbulent flow inside rod bundles. In order to establish confidence on application of computational fluid dynamics (CFD) to simulate the crossflow in rod bundles, three Reynolds-Averaged Navier Stokes (RANS) models i.e. the realizable k-ε model, the k-ω SST mod...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2021-11-01
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| Series: | Nuclear Engineering and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1738573321003090 |
| _version_ | 1818693496253448192 |
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| author | Fabian Wiltschko Wenhai Qu Jinbiao Xiong |
| author_facet | Fabian Wiltschko Wenhai Qu Jinbiao Xiong |
| author_sort | Fabian Wiltschko |
| collection | DOAJ |
| description | The crossflow is the key phenomenon in turbulent flow inside rod bundles. In order to establish confidence on application of computational fluid dynamics (CFD) to simulate the crossflow in rod bundles, three Reynolds-Averaged Navier Stokes (RANS) models i.e. the realizable k-ε model, the k-ω SST model and the Reynolds stress model (RSM), and the Large Eddy simulations (LES) with the Wall-Adapting Local Eddy-viscosity (WALE) model are validated based on the Particle Image Velocimetry (PIV) flow measurement experiment in a 5 × 5 rod bundle. In order to investigate effects of periodic boundary condition in the gap, the numerical results obtained with four inner subchannels are compared with that obtained with the whole 5 × 5 rod bundle. The results show that periodic boundaries in the gaps produce strong errors far downstream of the spacer grid, and therefore the full 5 × 5 rod bundle should be simulated. Furthermore, it can be concluded, that the realizable k-ε model can only provide reasonable results very close to the spacer grid, while the other investigated models are in good agreement with the experimental data in the whole downstream flow in the rod bundle. The LES approach shows superiority to the RANS models. |
| first_indexed | 2024-12-17T13:14:36Z |
| format | Article |
| id | doaj.art-7f4e34c423fb413a9b57800bf778d147 |
| institution | Directory Open Access Journal |
| issn | 1738-5733 |
| language | English |
| last_indexed | 2024-12-17T13:14:36Z |
| publishDate | 2021-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Engineering and Technology |
| spelling | doaj.art-7f4e34c423fb413a9b57800bf778d1472022-12-21T21:47:01ZengElsevierNuclear Engineering and Technology1738-57332021-11-01531136253634Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundleFabian Wiltschko0Wenhai Qu1Jinbiao Xiong2School of Nuclear Engineering, Shanghai Jiao Tong University, 200240, Shanghai, Minhang District, ChinaSchool of Nuclear Engineering, Shanghai Jiao Tong University, 200240, Shanghai, Minhang District, ChinaCorresponding author.; School of Nuclear Engineering, Shanghai Jiao Tong University, 200240, Shanghai, Minhang District, ChinaThe crossflow is the key phenomenon in turbulent flow inside rod bundles. In order to establish confidence on application of computational fluid dynamics (CFD) to simulate the crossflow in rod bundles, three Reynolds-Averaged Navier Stokes (RANS) models i.e. the realizable k-ε model, the k-ω SST model and the Reynolds stress model (RSM), and the Large Eddy simulations (LES) with the Wall-Adapting Local Eddy-viscosity (WALE) model are validated based on the Particle Image Velocimetry (PIV) flow measurement experiment in a 5 × 5 rod bundle. In order to investigate effects of periodic boundary condition in the gap, the numerical results obtained with four inner subchannels are compared with that obtained with the whole 5 × 5 rod bundle. The results show that periodic boundaries in the gaps produce strong errors far downstream of the spacer grid, and therefore the full 5 × 5 rod bundle should be simulated. Furthermore, it can be concluded, that the realizable k-ε model can only provide reasonable results very close to the spacer grid, while the other investigated models are in good agreement with the experimental data in the whole downstream flow in the rod bundle. The LES approach shows superiority to the RANS models.http://www.sciencedirect.com/science/article/pii/S1738573321003090Rod bundleSpacer gridMixing vanesLarge eddy simulationRANSBenchmark |
| spellingShingle | Fabian Wiltschko Wenhai Qu Jinbiao Xiong Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle Nuclear Engineering and Technology Rod bundle Spacer grid Mixing vanes Large eddy simulation RANS Benchmark |
| title | Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| title_full | Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| title_fullStr | Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| title_full_unstemmed | Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| title_short | Validation of RANS models and Large Eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| title_sort | validation of rans models and large eddy simulation for predicting crossflow induced by mixing vanes in rod bundle |
| topic | Rod bundle Spacer grid Mixing vanes Large eddy simulation RANS Benchmark |
| url | http://www.sciencedirect.com/science/article/pii/S1738573321003090 |
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