Decay of Swirling Turbulent Flow in Rod-bundle
An LES was carried out to clarify the mechanism of decaying swirl in a rod-bundle. In our LES, an immersed boundary method was used to treat this complex wall boundary in the Cartesian grid system. A consistent immersed boundary method and a one-equation dynamic SGS model were introduced for an accu...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
The Japan Society of Mechanical Engineers
2006-06-01
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| Series: | Journal of Fluid Science and Technology |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_36/_pdf/-char/en |
| _version_ | 1828134126001061888 |
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| author | Tsutomu IKENO Takeo KAJISHIMA |
| author_facet | Tsutomu IKENO Takeo KAJISHIMA |
| author_sort | Tsutomu IKENO |
| collection | DOAJ |
| description | An LES was carried out to clarify the mechanism of decaying swirl in a rod-bundle. In our LES, an immersed boundary method was used to treat this complex wall boundary in the Cartesian grid system. A consistent immersed boundary method and a one-equation dynamic SGS model were introduced for an accurate simulation of no-slip wall condition. The Reynolds number based on the bulk velocity, the rod pitch and the kinematic viscosity was approximately 4100. Our computational results were compared well with experimental and computational data obtained in other studies. The results were able to represent the effect of flow geometry: the flow around the mixing-vanes caused the swirl with a large-scale fluctuation enhancing heat transfer; a vortex enhancing enthalpy mixing between channels was produced in the rod gap; this developing vortex and the decreasing wake promoted the decay of the swirl more strongly than in a pipe. The LES technique introduced in this study is useful for designing the spacer by predicting the effect of flow control. |
| first_indexed | 2024-04-11T17:29:29Z |
| format | Article |
| id | doaj.art-ea8686214c5246508e98e68aa08d545f |
| institution | Directory Open Access Journal |
| issn | 1880-5558 |
| language | English |
| last_indexed | 2024-04-11T17:29:29Z |
| publishDate | 2006-06-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Fluid Science and Technology |
| spelling | doaj.art-ea8686214c5246508e98e68aa08d545f2022-12-22T04:12:11ZengThe Japan Society of Mechanical EngineersJournal of Fluid Science and Technology1880-55582006-06-0111364710.1299/jfst.1.36jfstDecay of Swirling Turbulent Flow in Rod-bundleTsutomu IKENO0Takeo KAJISHIMA1Nuclear Fuel Industries, LtdDepartment of Mechanical Engineering, Osaka UniversityAn LES was carried out to clarify the mechanism of decaying swirl in a rod-bundle. In our LES, an immersed boundary method was used to treat this complex wall boundary in the Cartesian grid system. A consistent immersed boundary method and a one-equation dynamic SGS model were introduced for an accurate simulation of no-slip wall condition. The Reynolds number based on the bulk velocity, the rod pitch and the kinematic viscosity was approximately 4100. Our computational results were compared well with experimental and computational data obtained in other studies. The results were able to represent the effect of flow geometry: the flow around the mixing-vanes caused the swirl with a large-scale fluctuation enhancing heat transfer; a vortex enhancing enthalpy mixing between channels was produced in the rod gap; this developing vortex and the decreasing wake promoted the decay of the swirl more strongly than in a pipe. The LES technique introduced in this study is useful for designing the spacer by predicting the effect of flow control.https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_36/_pdf/-char/enturbulent flowswirling flowvortexlesimmersed boundary methodfinite difference method |
| spellingShingle | Tsutomu IKENO Takeo KAJISHIMA Decay of Swirling Turbulent Flow in Rod-bundle Journal of Fluid Science and Technology turbulent flow swirling flow vortex les immersed boundary method finite difference method |
| title | Decay of Swirling Turbulent Flow in Rod-bundle |
| title_full | Decay of Swirling Turbulent Flow in Rod-bundle |
| title_fullStr | Decay of Swirling Turbulent Flow in Rod-bundle |
| title_full_unstemmed | Decay of Swirling Turbulent Flow in Rod-bundle |
| title_short | Decay of Swirling Turbulent Flow in Rod-bundle |
| title_sort | decay of swirling turbulent flow in rod bundle |
| topic | turbulent flow swirling flow vortex les immersed boundary method finite difference method |
| url | https://www.jstage.jst.go.jp/article/jfst/1/1/1_1_36/_pdf/-char/en |
| work_keys_str_mv | AT tsutomuikeno decayofswirlingturbulentflowinrodbundle AT takeokajishima decayofswirlingturbulentflowinrodbundle |