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2024 Vol.57, Issue 12S Preview Page

Research Article

Analysis on behavior of geysering in storage and drainage tunnel using CFD model

CFD모형을 활용한 저류배수터널에서 공기-물 분출 거동 해석

Kyong Oh Baeka
,
Chan Woong Leeb
,
Dong Yeol Leec*
백 경오a
,
이 찬웅b
,
이 동열c*
aProfessor, Department of Civil and Environmental Engineering, Hankyong National University, Anseong, Korea
bUndergraduate Student, Department of Civil and Environmental Engineering, Hankyong National University, Anseong, Korea
cPh.D. Student, Department of Civil and Environmental Engineering, Hankyong National University, Anseong, Korea
a한경국립대학교 건설환경공학부 교수
b한경국립대학교 건설환경공학부 학사과정
c한경국립대학교 건설환경공학부 박사과정
*Corresponding Author
31 December 2024. pp. 1201-1210
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Abstract

As one of the flood prevention measures for urban areas against extreme rainfall event, underground storage and drainage tunnels have been proposed. The flow within these tunnels initially starts as open-channel flow and later transitions to pressurized flow, exhibiting complex hydrodynamic behaviors such as air-water mixture flow and geysering phenomena. In this study, the three-dimensional CFD model, Flow-3D, which is suitable for analyzing such air-water mixture flow, was selected to focus on investigating the geysering phenomenon in storage and drainage tunnels. To validate the numerical model, previous experimental case studies were selected to replicate the geysering phenomenon, and variations in pressure head were compared. Furthermore, this study examined how the behavior of air and water ejected through vent pipes varied depending on different factors. The patterns of the geysering were analyzed based on changes in the main tunnel's flow rate, vent pipe diameter, vent pipe location, and the slope of the main tunnel. Results showed that as the main tunnel flow rate increased and the slope decreased, the geysering occurred more frequently. Conversely, when the main tunnel had a steeper slope (2%), no geysering occurred. As the vent pipe diameter increased, geysering occurred relatively faster. When the vent pipe location was shifted upstream or downstream, the geysering pattern exhibited diverse behaviors without a consistent regularity.

Keywords
Storage and drainage tunnel
Vent pipe
Two-phase mixture flow
Geysering
CFD model

극한 호우에 대비한 도시의 침수방지대책 중 하나로 지하 저류배수터널이 제안되고 있다. 이러한 터널 내 흐름은 초기에는 개수로 흐름으로 시작하여 이후에는 관수로 흐름으로 전환되면서 공기-물의 이상류 혼합 및 공기-물 분출 현상과 같은 복잡한 유체 역학적 거동을 보인다. 본 연구에서는 이러한 공기-물 혼합 흐름을 분석하는 데 적합한 3차원 CFD 모형인 Flow-3D를 선택하여 저류배수터널 내 공기-물 분출 현상을 중점적으로 살펴보았다. 수치 모형의 검증을 위해 기존 실험 사례를 선택하여 공기-물 분출 현상을 재현하고 압력수두 변동을 비교하였다. 또한, 배기관을 통해 분출되는 공기와 물의 거동이 다양한 요소에 따라 어떻게 변화하는지 분석하였다. 본관 터널의 유량, 배기관의 직경, 배기관의 위치, 그리고 본관의 기울기 변화에 따른 공기-물 분출 현상의 양상을 분석한 결과, 본관 유량이 증가하고 기울기가 감소할수록 분출 현상이 빈번하게 발생하였다. 반면, 본관의 기울기가 급한 경우(2%), 공기-물 분출 현상이 발생하지 않았다. 배기관의 직경이 커질수록 분출이 상대적으로 더 빠르게 발생하였다. 배기관의 위치가 상류 또는 하류로 이동할 경우, 분출 현상은 일정한 규칙성 없이 다양한 양상을 보였다.

키워드
저류배수터널
배기관
이상류 혼합
공기-물 분출
CFD 모형
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 57
  • No :12
  • Pages :1201-1210
  • Received Date : 2024-10-16
  • Revised Date : 2024-11-22
  • Accepted Date : 2024-11-25
  • DOI :https://doi.org/10.3741/JKWRA.2024.57.S-1.1201
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