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2023 Vol.56, Issue 10

Research Article

Numerical investigation of swash-swash interaction driven by double dam-break using OpenFOAM

OpenFOAM을 활용한 포말대 이중 댐-붕괴 수치모형실험

Juhee Oka
,
Yeulwoo Kimb*
,
Delisle Marie-Pierre C.c
옥 주희a
,
김 열우b*
,
Marie-Pierre C. Delislec
aMaster Student, Department of Civil Engineering, Pukyong National University, Busan, Korea
bAssistant Professor, Department of Civil Engineering, Pukyong National University, Busan, Korea
cPostdoctoral Scholar, Woods Hole Oceanographic Institution, MA, USA
a부경대학교 토목공학과 석사과정
b부경대학교 토목공학과 조교수
cWoods Hole Oceanographic Institution 박사 후 연구원
*Corresponding Author
31 October 2023. pp. 603-617
PDF XML Citation
Abstract

This study aims to provide a better understanding of the turbulent flow characteristics in swash zone. A double dam-break method is employed to generate the swash zone flow. Comparing with the conventional single dam-break method, a delay between two gate opening can be controlled to reproduce various interactions between uprush and backwash. For numerical simulations, overInterDyMFoam based on OpenFOAM is adopted. Using overInterDyMFoam, interface between two immiscible fluids having different densities (i.e., air and water phases) can be tracked in a moving mesh with multiple layers. Two-dimensional Reynolds-Averaged Navier-Stokes equations are solved with a standard k-ϵ turbulence model for momentum and continuity. Numerical model results are validated with laboratory experiment data for the time series of water depth and streamwise velocity. Turbulent kinetic energy distribution is further investigated to identify the turbulence evolution for each flow regime (i.e., uprush, backwash, and swash-swash interaction).

Keywords
Double dam-break
OpenFOAM
Overset mesh
Dynamic mesh
Swash-swash interaction

본 연구는 포말대 흐름의 난류특성에 대한 이해를 목표로 한다. 포말대 흐름을 재현하기 위해 이중 댐-붕괴 파랑생성법이 제시되었다. 기존 단일 댐-붕괴 실험과 비교하여 이중 댐-붕괴 실험은 두 개의 수문의 개방 시간을 조절하여 처오름과 처내림의 다양한 상호작용을 구현할 수 있다. 수치모형으로는 OpenFOAM의 overInterDyMFoam이 활용되었다. overInterDyMFoam은 밀도가 다른 두 유체(i.e., 공기, 물)의 경계면 추적기법과 동격자 및 중첩 격자 기법을 결합한 모형이다. 질량보존 및 운동량 방정식으로는 k-ϵ 난류모형이 결합된 이차원 Reynolds-Averaged Navier-Stokes 모형이 채택되었다. 수치모형실험 결과는 수리모형실험의 수심 및 흐름 방향 유속 시계열과 비교하여 정확도가 검증되었다. 난류 운동 에너지 분포특성을 확인하여 각 흐름 단계(i.e., 처오름, 처내림, 흐름의 상호작용)의 난류 진화 특성을 고찰하였다.

키워드
이중 댐-붕괴
OpenFOAM
중첩 격자
동격자
처오름-처내림 상호작용
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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 : 56
  • No :10
  • Pages :603-617
  • Received Date : 2023-08-31
  • Revised Date : 2023-09-19
  • Accepted Date : 2023-09-19
  • DOI :https://doi.org/10.3741/JKWRA.2023.56.10.603
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