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2025 Vol.58, Issue 2 Preview Page

Research Article

Numerical simulation of wave generated turbulence around a cylinder using large eddy simulation

Large eddy simulation을 이용한 실린더 주변에서의 파랑 발생 난류 수치모의

Sunmin Yoona
,
Yeulwoo Kimb*
,
Seongeun Choic
,
Timu W. Galliend
윤 선민a
,
김 열우b*
,
최 성은c
,
Timu W. Galliend
aMaster Student, Civil Engineerring Major, Department of Sustainable Engineering, Pukyong National University, Busan, Korea
bAssistant Professor, Civil Engineerring Major, Department of Sustainable Engineering, Pukyong National University, Busan, Korea
cPostdoctoral Researcher, Civil Engineerring Major, Department of Sustainable Engineering, Pukyong National University, Busan, Korea
dAssociate Professor, Department of Civil and Environmental Engineering, University of California, Los Angeles, CA, USA
a국립부경대학교 지속가능공학부 토목공학전공 석사과정
b국립부경대학교 지속가능공학부 토목공학전공 조교수
c국립부경대학교 지속가능공학부 토목공학전공 박사후연구원
dUniversity of California, Los Angeles, 토목환경공학과 부교수
*Corresponding Author
28 February 2025. pp. 183-192
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Abstract

This study analyzes turbulent flow characteristics generated by the interaction between regular sinusoidal waves and a vertical cylinder using large eddy simulation methods. Numerical simulations are conducted with olaFlow and overOlaDyMFlow. An interface compression method is used to resolve the water and air interactions. Model results are validated against experimental data obtained from DHI hydraulic facilities in Denmark. Additionally, two meshing techniques, snappyHexMesh and oversetMesh are evaluated relative to their performance in modeling wave-cylinder interactions. Model results demonstrate that the unstructured grid with snappyHexMesh accurately captures the detailed boundary-layer flow and vortex structures near the cylinder, while the multi-layer features in oversetMesh effectively handles complex boundary conditions in larger computational domains. Both meshing methods show good agreement with experimental results for wave height and fluid forces. However, slight discrepancies in shear stress distribution highlight the unique strengths of each technique. This research provides critical insights for numerical modeling of wave-induced forces and turbulence evolution around offshore structures, offering guidance for future designs and safety assessments.

Keywords
Large eddy simulation
Wave-cylinder interaction
OpenFOAM
snappyHexMesh
oversetMesh

본 연구는 Large Eddy Simulation (LES) 기법을 활용하여 수직 원통형 해양 구조물 주변에서의 동역학적 난류 유동 특성을 수치적으로 분석하였다. OpenFOAM의 olaFlow와 overOlaDyMFlow를 사용하여 물과 공기 사이의 자유수면 상호작용을 재현하였으며, 이를 덴마크 DHI 수리모형실험 데이터를 통해 검증하였다. DHI 수리모형실험은 수직 실린더 주변에서 파랑에 의해 발생하는 파랑 하중과 수면 변위 시계열을 측정한 데이터를 기반으로 한다. 수리모형실험과 비교를 통해 수치모형의 신뢰성을 평가하였다. 본 연구에서는 snappyHexMesh와 oversetMesh 두 가지 격자 생성 기법을 비교하여 파랑-실린더 간의 상호작용 모의에서 각 기법의 성능을 평가하였다. snappyHexMesh는 실린더 근처의 경계층 유동과 와류 구조를 정밀하게 포착하는 데 탁월한 성능을 보였으며, oversetMesh는 복잡한 경계 조건과 넓은 계산 영역을 효과적으로 처리하는 데 강점을 보였다. 두 기법 모두 파고와 파랑 하중에 대해 실험 결과와 높은 일치성을 나타내었지만, 난류 유동과 전단 응력 분포에서는 미세한 차이가 확인되었다. 본 연구는 해양 구조물 주변에서 파랑에 의해 유발되는 힘과 난류를 수치적으로 모의하는 데 격자 기법에 대한 통찰을 제공하며, 이러한 결과는 향후 해양 구조물 설계 및 안정성 평가 연구에 기여할 수 있다.

키워드
Large eddy simulation
파랑-구조물 상호작용
OpenFOAM
snappyHexMesh
oversetMesh
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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 : 58
  • No :2
  • Pages :183-192
  • Received Date : 2025-01-23
  • Revised Date : 2025-02-03
  • Accepted Date : 2025-02-04
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.2.183
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