대한토목학회논문집 (KSCE Journal of Civil and Environmental Engineering Research)

  • 제43권6호
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  • Pages.749-762
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  • 2023
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  • 1015-6348(pISSN)
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  • 2799-9629(eISSN)
대한토목학회 (Korean Society of Civil Engeneers)
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도수의 수치 모의

Numerical Simulation of Hydraulic Jump

  • 황승용 (한국건설기술연구원 수자원환경연구본부)
  • 투고 : 2023.09.22
  • 심사 : 2023.10.11
  • 발행 : 2023.12.01
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⟨ 이전 논문 다음 논문 ⟩

초록

천수 방정식 흐름률 계산에 근사 Riemann 해법을 채택한 수심 적분 모형을 도수 실험에 적용하였다. 도수 때문에 단일 수로에서 서로 다른 흐름 양상이 동시에 나타나므로 흐름 저항에 대해 수심이나 유속에 무관한 Manning 조도 계수보다는 흐름 조건을 반영할 수 있는 Weisbach 저항 계수를 채택하였다. 모의 결과는 실험 결과에 잘 부합되었으며, Weisbach 계수로부터 환산한 Manning 계수는 사류 구간과 상류 구간에서 각 각 적절하게 설정되고 있음을 확인하였다. 도수 실험과 비교에서 정수압 가정에 기반한 천수 방정식의 한계가 드러나 비정수압 천수 흐름 모형 도입의 필요성이 높아졌다.

A depth-integrated model with an approximate Riemann solver for flux computation of the shallow water equations was applied to hydraulic jump experiments. Due to the hydraulic jump, different flow regimes occur simultaneously in a single channel. Therefore, the Weisbach resistance coefficient, which reflects flow conditions rather than the Manning roughness coefficient that is independent of depth or flow, has been employed for flow resistance. Simulation results were in good agreement with experimental results, and it was confirmed that Manning coefficients converted from Weisbach coefficients were appropriately set in the supercritical and subcritical flow reaches, respectively. Limitations of the shallow water equations that rely on hydrostatic assumptions have been revealed in comparison with hydraulic jump experiments, highlighting the need for the introduction of a non-hydrostatic shallow-water flow model.

키워드

과제정보

This study is a sequel of Oh et al. (1998). The author would like to thank Oh, Seong-Taek for reviewing an early version of this article. This work was supported by the Korea Environment Industry & Technology Institute (KEITI) through the R&D Project: Water Management Program for Drought (Grant # 2022003610003; Korea Institute of Civil Engineering and Building Technology (KICT) Project # 20230076), funded by the Korea Ministry of Environment (MOE).

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