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한국수자원학회 / v.3, no.4, 2002년, pp.247-258 
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( REYNOLDS STRESS MODELING OF OPEN-CHANNEL FLOWS OVER BEDFORMS ) |
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| 초 록 |
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| This paper presents a non-isotropic turbulence modeling of flows over bedforms. The Reynolds stress model is used for the turbulence closure. In the model, Launder, Reece, and Rodi's model and Hanjalic and Launder's model are employed f3r the pressure strain correlation term and the diffusion term, respectively. The mean flow and turbulence structures are simulated and compared with profiles measured in the experiments. The numerical solutions from two-equation turbulence models are also provided for comparisons. The Reynolds stress model yields the separation length of eddy similar to the other numerical results. Using the developed model, the resistance coefficients are also estimated for the flows at different Froude numbers. Karim's (1999) relationship is used to determine the bedform geometry. It is found that the values of the form drag and the skin friction are very similar to those obtained by the other turbulence models. meaning higher values of the form drag and lower values of the skin friction compared with the empirical formulas. |
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| 키워드 |
| non-isotropic turbulence model;Reynolds stress model;bedforms;form drag;skin friction; |
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Water Engineering Research / v.3, no.4, 2002년, pp.247-258
한국수자원학회
ISSN : 1229-6503
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200211921503022)
언어 : 영어 |
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| 논문 제공 : KISTI 한국과학기술정보연구원 |
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