Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of 1D finite volume model for discontinues flow simulation (K-River)

불연속 흐름 모의를 위한 1차원 유한체적 모형 K-River의 개발

  • Jeong, Anchul (International Water Resources Research Institute, Chungnam National University) ;
  • An, Hyunuk (Local Environmental Engineering Department, Chungnam National University) ;
  • Kim, Yeonsu (Water Resources Research Center, K-water Convergence Institute) ;
  • Noh, Joonwoo (Water Resources Research Center, K-water Convergence Institute)
  • 정안철 (충남대학교 국제수자원연구소) ;
  • 안현욱 (충남대학교 지역환경토목학과) ;
  • 김연수 (K-water 융합연구원 물순환연구소) ;
  • 노준우 (K-water 융합연구원 물순환연구소)
  • Received : 2018.07.31
  • Accepted : 2018.09.07
  • Published : 2018.10.31
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Abstract

There are a large number of weirs installed in rivers of Korea, and these characteristics are not common in other countries. When the flow passes through a structure such as a weir, discontinuous flow occurs. In terms of numerical simulation, it affects the numerical instability due to the balance between the flow term and the source term. In order to solve these problems, many researchers used empirical formulas or numerical scheme simplification. Recently, researches have been conducted to use more accurate numerical scheme. K-River was developed to reflect the characteristics of domestic rivers and calculate the discontinuous flow more accurately. For the verification of K-River, 1) numerical experiment simulations with a bump in the bed, 2) laboratory experiment of hydraulic jump simulation, 3) real river were performed. K-River verified its applicability by simulating results similar to the exact solution and observed value in all simulations.

국내의 하천에는 많은 수의 보가 설치되어 있으며, 이러한 특성은 국외에서는 흔하지 않은 편이다. 흐름이 보와 같은 구조물을 통과하는 경우에는 불연속 흐름이 발생하게 되며, 수치모의 측면에서는 흐름항과 생성항의 균형 등의 문제로 수치적 안정성에 많은 영향을 준다. 이러한 문제점을 해결하기 위해서 경험식이나 해석기법의 단순화 등에 의존해 왔으며, 최근에 들어서는 보다 정확한 수치해석기법을 이용하려는 연구가 꾸준히 수행되고 있다. K-River는 국내의 하천 특성을 반영하고, 불연속 흐름을 보다 정확히 계산하기 위한 목적으로 개발되었다. K-River의 검증을 위하여 1) 하상융기가 존재하는 개수로 수치실험 모의, 2) 도수현상 실내실험 모의, 3) 실제 하천의 수문 사상 모의를 수행하였다. 모든 모의에서 해석해 및 관측치와 유사한 결과를 모의하여 K-River의 적용성을 검증하였다.

Keywords

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