Numerical investigation of flow characteristics through simple support grids in a 1 x 3 rod bundle
This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD methodology and the most accurate turbulence model which could reflect the actual physics of the flow was determined. In this context, a CFD model was...
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Published in | Nuclear engineering and technology Vol. 51; no. 8; pp. 1905 - 1915 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
01.12.2019
Elsevier 한국원자력학회 |
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Abstract | This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD methodology and the most accurate turbulence model which could reflect the actual physics of the flow was determined. In this context, a CFD model was created simulating the experimental studies on a single-phase flow [1] and the results were compared with the experimental data. In the first part of the study, influence of mesh was examined. Tetra, hybrid and poly type meshes were analyzed and convergence study was carried out on each in order to determine the most appropriate type and density. k−ε Standard and RSM LPS turbulence models were used in this section. In the second part of the study, the most appropriate turbulence model that could reflect the physics of the actual flow was investigated. RANS based turbulence models were examined using the mesh that was determined in the first part. Velocity and turbulence intensity results obtained on the upstream and downstream of the spacer grid at –3dh, +3dh and +40dh locations were compared with the experimental data. In the last section of the study, the behavior of flow through the spacer grid was examined and its prominent aspects were highlighted on the most appropriate turbulence model determined in the second part. Results of the study revealed the importance of mesh type. Hybrid mesh having the largest number of structured elements performed remarkably better than the other two on results. While comparisons of numerical and experimental results showed an overall agreement within all turbulence models, RSM LPS presented better results than the others. Lastly, physical appearance of the flow through spacer grids revealed that springs has more influence on flow than dimples and induces transient flow behaviors. As a result, flow through a simple support grid was examined and the most appropriate turbulence model reflecting the actual physics of the flow was determined. |
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AbstractList | This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD methodology and the most accurate turbulence model which could reflect the actual physics of the flow was determined. In this context, a CFD model was created simulating the experimental studies on a single-phase flow [1] and the results were compared with the experimental data. In the first part of the study, influence of mesh was examined. Tetra, hybrid and poly type meshes were analyzed and convergence study was carried out on each in order to determine the most appropriate type and density. k−ε Standard and RSM LPS turbulence models were used in this section. In the second part of the study, the most appropriate turbulence model that could reflect the physics of the actual flow was investigated. RANS based turbulence models were examined using the mesh that was determined in the first part. Velocity and turbulence intensity results obtained on the upstream and downstream of the spacer grid at –3dh, +3dh and +40dh locations were compared with the experimental data. In the last section of the study, the behavior of flow through the spacer grid was examined and its prominent aspects were highlighted on the most appropriate turbulence model determined in the second part. Results of the study revealed the importance of mesh type. Hybrid mesh having the largest number of structured elements performed remarkably better than the other two on results. While comparisons of numerical and experimental results showed an overall agreement within all turbulence models, RSM LPS presented better results than the others. Lastly, physical appearance of the flow through spacer grids revealed that springs has more influence on flow than dimples and induces transient flow behaviors. As a result, flow through a simple support grid was examined and the most appropriate turbulence model reflecting the actual physics of the flow was determined. Keywords: Turbulence, CFD, Simple support grid, 1x3 rod bundle, Hybrid mesh, Reynolds stress model This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD methodology and the most accurate turbulence model which could reflect the actual physics of the flow was determined. In this context, a CFD model was created simulating the experimental studies on a single-phase flow [1] and the results were compared with the experimental data. In the first part of the study, influence of mesh was examined. Tetra, hybrid and poly type meshes were analyzed and convergence study was carried out on each in order to determine the most appropriate type and density. k−ε Standard and RSM LPS turbulence models were used in this section. In the second part of the study, the most appropriate turbulence model that could reflect the physics of the actual flow was investigated. RANS based turbulence models were examined using the mesh that was determined in the first part. Velocity and turbulence intensity results obtained on the upstream and downstream of the spacer grid at –3dh, +3dh and +40dh locations were compared with the experimental data. In the last section of the study, the behavior of flow through the spacer grid was examined and its prominent aspects were highlighted on the most appropriate turbulence model determined in the second part. Results of the study revealed the importance of mesh type. Hybrid mesh having the largest number of structured elements performed remarkably better than the other two on results. While comparisons of numerical and experimental results showed an overall agreement within all turbulence models, RSM LPS presented better results than the others. Lastly, physical appearance of the flow through spacer grids revealed that springs has more influence on flow than dimples and induces transient flow behaviors. As a result, flow through a simple support grid was examined and the most appropriate turbulence model reflecting the actual physics of the flow was determined. This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD methodology and the most accurate turbulence model which could reflect the actual physics of the flow was determined. In this context, a CFD model was created simulating the experimental studies on a single-phase flow [1] and the results were compared with the experimental data. In the first part of the study, influence of mesh was examined. Tetra, hybrid and poly type meshes were analyzed and convergence study was carried out on each in order to determine the most appropriate type and density. Standard and RSM LPS turbulence models were used in this section. In the second part of the study, the most appropriate turbulence model that could reflect the physics of the actual flow was investigated. RANS based turbulence models were examined using the mesh that was determined in the first part. Velocity and turbulence intensity results obtained on the upstream and downstream of the spacer grid at –3dh, +3dh and +40dh locations were compared with the experimental data. In the last section of the study, the behavior of flow through the spacer grid was examined and its prominent aspects were highlighted on the most appropriate turbulence model determined in the second part. Results of the study revealed the importance of mesh type. Hybrid mesh having the largest number of structured elements performed remarkably better than the other two on results. While comparisons of numerical and experimental results showed an overall agreement within all turbulence models, RSM LPS presented better results than the others. Lastly, physical appearance of the flow through spacer grids revealed that springs has more influence on flow than dimples and induces transient flow behaviors. As a result, flow through a simple support grid was examined and the most appropriate turbulence model reflecting the actual physics of the flow was determined. KCI Citation Count: 0 |
Author | Karaman, Umut Rau, Adam Kocar, Cemil Kim, Seungjin |
Author_xml | – sequence: 1 givenname: Umut surname: Karaman fullname: Karaman, Umut email: ukaraman@hacettepe.edu.tr organization: Department of Nuclear Engineering, Hacettepe University, Ankara, Turkey – sequence: 2 givenname: Cemil surname: Kocar fullname: Kocar, Cemil email: ckocar@hacettepe.edu.tr organization: Department of Nuclear Engineering, Hacettepe University, Ankara, Turkey – sequence: 3 givenname: Adam surname: Rau fullname: Rau, Adam email: awr5209@psu.edu organization: Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA, 16802, USA – sequence: 4 givenname: Seungjin surname: Kim fullname: Kim, Seungjin email: seungjin@purdue.edu organization: School of Nuclear Engineering, Purdue University, Nuclear Engineering Building 400 Central Drive West Lafayette, IN, 47907-2017, USA |
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CitedBy_id | crossref_primary_10_1016_j_ijthermalsci_2021_107039 crossref_primary_10_1016_j_nucengdes_2024_113117 crossref_primary_10_1016_j_pnucene_2021_104040 crossref_primary_10_3390_pr10102139 crossref_primary_10_1016_j_pnucene_2024_105175 crossref_primary_10_1063_5_0203631 crossref_primary_10_1016_j_csite_2022_102004 crossref_primary_10_1016_j_jwpe_2023_104411 |
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Keywords | CFD Simple support grid Turbulence 1x3 rod bundle Hybrid mesh Reynolds stress model |
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Snippet | This paper investigated the influence of simple support girds on flow, irrespective of having mixing vanes, in a 1 x 3 array rod bundle by using CFD... |
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SubjectTerms | 1x3 rod bundle CFD Hybrid mesh Reynolds stress model Simple support grid Turbulence 원자력공학 |
Title | Numerical investigation of flow characteristics through simple support grids in a 1 x 3 rod bundle |
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