Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Development of 2D inundation model based on adaptive cut cell mesh (K-Flood)

적응적 분할격자 기반 2차원 침수해석모형 K-Flood의 개발

  • An, Hyunuk (Local Environmental Engineering Department, Chungnam National University) ;
  • Jeong, Anchul (International Water Resources Research Institute, Chungnam National University) ;
  • Kim, Yeonsu (Water Resources Research Center, K-water Convergence Institute) ;
  • Noh, Joonwoo (Water Resources Research Center, K-water Convergence Institute)
  • 안현욱 (충남대학교 지역환경토목학과) ;
  • 정안철 (충남대학교 국제수자원연구소) ;
  • 김연수 (K-water 융합연구원 물순환연구소) ;
  • 노준우 (K-water 융합연구원 물순환연구소)
  • Received : 2018.07.20
  • Accepted : 2018.08.13
  • Published : 2018.10.31
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Abstract

An adaptive cut-cell grid based 2D inundation analysis model, K-Flood, is developed in this study. Cut cell grid method divides a grid into a flow area and a non-flow area depending the characteristics of the flows. With adaptive mesh refinement technique cut cell method can represent complex flow area using relatively small number of cells. In recent years, the urban inundation modeling using high resolution and fine quality data is increasing to achieve more accurate flood analysis or flood forecasting. K-Flood has potential to simulate such complex urban inundation using efficient grid generation technique. A finite volume numerical scheme of second order accuracy for space and time was applied. For verification of K-Flood, 1) shockwave reflex simulation by circular cylinder, 2) urban flood experiment simulation, 3) Malpasset dam collapse simulation are performed and the results are compared with observed data and previous simulation results.

본 연구에서는 적응적 분할격자기반 2차원 침수해석모형 K-Flood를 개발하였다. 분할격자기법은 흐름 특성을 기반으로 격자를 분할하여 흐름영역과 비흐름영역으로 구분하는 격자생성기법이며, 분할격자기법과 격자세분화기법을 동시에 활용하면 매우 적은 수의 격자로 복잡한 형상의 흐름영역을 표현할 수 있어 효율적인 모의가 가능하다. 특히 최근 도시홍수에 대해 매우 정밀한 해상도의 자료와 격자를 이용하여 보다 정확한 침수해석 또는 예보를 하고자 하는 시도가 늘어나고 있으며, K-Flood는 이러한 복잡한 흐름영역의 계산 시 적응적 분할격자를 활용하여 효율적인 격자생성이 가능하다. 공간 및 시간에 대해 2차 정확도의 유한체적 수치해법이 적용되었다. K-Flood의 검증을 위해 2차원 침수해석모형의 검증에 널리 사용되고 있는 1) 원형 실린더에 의한 충격파 반사 모의, 2) 도시홍수실험 모의, 3) Malpasset 댐붕괴 모의를 수행하였다. 모든 모의에서 관측자료 및 과거의 모의결과와 비교하여 성공적으로 K-Flood의 성능을 검증하였다.

Keywords

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