Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries
The large eddy simulation (LES) method based on Vreman subgrid-scale model and SIMPIEC algorithm were applied to accurately capture the flowing character in Francis turbine passage under the small opening condition. The methodology proposed is effective to understand the flow structure well. It over...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2014-07-01
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| Series: | Advances in Mechanical Engineering |
| Online Access: | https://doi.org/10.1155/2014/570189 |
| _version_ | 1818536607106465792 |
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| author | Tao Guo Lixiang Zhang Wenquan Wang Zhumei Luo |
| author_facet | Tao Guo Lixiang Zhang Wenquan Wang Zhumei Luo |
| author_sort | Tao Guo |
| collection | DOAJ |
| description | The large eddy simulation (LES) method based on Vreman subgrid-scale model and SIMPIEC algorithm were applied to accurately capture the flowing character in Francis turbine passage under the small opening condition. The methodology proposed is effective to understand the flow structure well. It overcomes the limitation of eddy-viscosity model which is excessive, dissipative. Distributions of pressure, velocity, and vorticity as well as some special flow structure in guide vane near-wall zones and blade passage were gained. The results show that the tangential velocity component of fluid has absolute superiority under small opening condition. This situation aggravates the impact between the wake vortices that shed from guide vanes. The critical influence on the balance of unit by spiral vortex in blade passage and the nonuniform flow around guide vane, combined with the transmitting of stress wave, has been confirmed. |
| first_indexed | 2024-12-11T18:40:08Z |
| format | Article |
| id | doaj.art-c3331814437b46ed9fbe2867a2c41009 |
| institution | Directory Open Access Journal |
| issn | 1687-8132 |
| language | English |
| last_indexed | 2024-12-11T18:40:08Z |
| publishDate | 2014-07-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Advances in Mechanical Engineering |
| spelling | doaj.art-c3331814437b46ed9fbe2867a2c410092022-12-22T00:54:38ZengSAGE PublishingAdvances in Mechanical Engineering1687-81322014-07-01610.1155/2014/57018910.1155_2014/570189Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex GeometriesTao GuoLixiang ZhangWenquan WangZhumei LuoThe large eddy simulation (LES) method based on Vreman subgrid-scale model and SIMPIEC algorithm were applied to accurately capture the flowing character in Francis turbine passage under the small opening condition. The methodology proposed is effective to understand the flow structure well. It overcomes the limitation of eddy-viscosity model which is excessive, dissipative. Distributions of pressure, velocity, and vorticity as well as some special flow structure in guide vane near-wall zones and blade passage were gained. The results show that the tangential velocity component of fluid has absolute superiority under small opening condition. This situation aggravates the impact between the wake vortices that shed from guide vanes. The critical influence on the balance of unit by spiral vortex in blade passage and the nonuniform flow around guide vane, combined with the transmitting of stress wave, has been confirmed.https://doi.org/10.1155/2014/570189 |
| spellingShingle | Tao Guo Lixiang Zhang Wenquan Wang Zhumei Luo Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries Advances in Mechanical Engineering |
| title | Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries |
| title_full | Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries |
| title_fullStr | Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries |
| title_full_unstemmed | Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries |
| title_short | Rotating Turbulent Flow Simulation with LES and Vreman Subgrid-Scale Models in Complex Geometries |
| title_sort | rotating turbulent flow simulation with les and vreman subgrid scale models in complex geometries |
| url | https://doi.org/10.1155/2014/570189 |
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