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논문 기본 정보

자료유형
학술저널
저자정보
Choi, Sung-Uk (School of Civil & Environmental Engineering, Yonsei University) Kang, Hyeong-sik (School of Civil & Environmental Engineering, Yonsei University)
저널정보
한국수자원학회 Water engineering research : international journal of KWRA Water engineering research : international journal of KWRA 제3권 제4호
발행연도
2002.1
수록면
247 - 258 (12page)

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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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