[논문]OLAFOAM에 기초한 원형유공케이슨 방파제의 반사율 및 작용파압에 관한 3차원시뮬레이션

이광호; 배주현; 김상기; 김도삼

doi:10.9765/kscoe.2017.29.6.286

OLAFOAM에 기초한 원형유공케이슨 방파제의 반사율 및 작용파압에 관한 3차원시뮬레이션
Three-dimensional Simulation of Wave Reflection and Pressure Acting on Circular Perforated Caisson Breakwater by OLAFOAM 원문보기

한국해안·해양공학회논문집 = Journal of Korean Society of Coastal and Ocean Engineers, v.29 no.6, 2017년, pp.286 - 304

이광호 (가톨릭관동대학교 에너지플랜트공학과) , 배주현 (한국해양대학교 대학원 토목환경공학과) , 김상기 ((주)유주) , 김도삼 (한국해양대학교 건설공학과)

초록
AI-Helper

본 연구에서는 어항 등과 같은 소규모 항에서 적용 가능한 격자블록결속에 의한 신형식의 원형유공케이슨을 제안하고, 이러한 방파제의 수리특성을 수치적으로 검토하였다. 본 연구에서 적용한 수치해석 코드는 최근들어 다양한 분야에서 공학적 문제해결을 위해 그 사용예가 급증하고 있는 공중사용허가서(오픈소스 기반) 라이선스 기반의 OpenFOAM(Open Field Operation and Manipulation)에 조파모듈, 투과층 해석모듈, 및 반사파 제어기능 등을 추가한 OLAFOAM을 적용하였다. 본 연구는 먼저, 1) 규칙파 하 3차원슬리트케이슨 방파제에서 파의 파압변동에 대해 기존의 실험 결과와 비교 검토하고, 2) 불규칙파를 조파하여 목표한 파의 재현과 주파수스펙트럼을 비교 검토하여 OLAFOAM의 타당성을 검증하였다. 이로부터 슬리트케이슨과 유사한 원형유공케이슨이 설치된 일정수심의 3차원수치파동수조에 불규칙파를 조파하여 유수실 폭과 유의파고 및 유의주기의 변화에 따른 원형유공케이슨 방파제에서 월파량, 반사율, 파압분포 및 그들의 상호연관성을 면밀히 검토 분석하였다. 이로부터 파압분포는 불투과연직벽체에 대한 Goda 식의 결과보다 매우 작은 결과를 나타내었으며, 반사율은 기존의 슬리트케이슨에서 반사율의 변동범위 내에 존재하는 것을 알 수 있었다.

Abstract ▼ AI-Helper

In this study, we proposed a new-type of circular perforated caisson breakwater consisting of a bundle of latticed blocks that can be applied to a small port such as a fishing port, and numerically investigated the hydraulic characteristics of the breakwater. The numerical method used in this study is OLAFOAM which newly added wave generation module, porous media analysis module and reflected wave control module based on OpenFOAM that is open source CFD software published under the GPL license. To investigate the applicability of OLAFOAM, the variations of wave pressure acting on the three-dimensional slit caisson were compared to the previous experimental results under the regular wave conditions, and then the performance for irregular waves was examined from the reproducibility of the target irregular waves and frequency spectrum analysis. As a result, a series of numerical simulations for the new-type of circular perforated caisson breakwaters, which is similar to slit caisson breakwater, was carried out under the irregular wave actions. The hydraulic characteristics of the breakwater such as wave overtopping, reflection, and wave pressure distribution were carefully investigated respect to the significant wave height and period, the wave chamber width, and the interconnectivity between them. The numerical results revealed that the wave pressure acting on the new-type of circular perforated caisson breakwaters was considerably smaller than the result of the impermeable vertical wall computed by the Goda equation. Also, the reflection of the new-type caisson breakwater was similar to the variation range of the reflection coefficient of the existing slit caisson breakwater.

주제어

질의응답

핵심어	질문	논문에서 추출한 답변
	원형유공케이슨 방파제에 적용한 공법의 특징은 무엇인가?	본 연구에서는 전술한 유공회파블록제의 기능성을 보다 향상시킨 것으로, 어항 등과 같은 소규모 항에서 항내정온도 및 낚시와 같은 레크리에이션과 친수할동 등에서 안전을 동시에 확보할 수 있으며, 더불어 우수한 경관을 유지할 수 있는 격자블록결속에 의한 신형식의 원형유공케이슨 방파제를 개발한다. 이 방파제의 형식은 전술한 유공회파블록제에서 현장타설 말뚝으로 블록과 블록을 결속하는 공법은 동일하지만 반사율을 보다 저감시키기 위하여 유공회파블록의 배후에 슬리트케이슨 방파제와 같이 유수실을 적용한 경우이다. 여기서, 블록과 블록을 결속하여 내파안정성을 도모하는 공법은 대규모 항만의 외곽 방파제에서 케이슨과 케이슨을 뒷채움재 혹은 케이블 등으로 결속하여 장대케이슨을 계획 · 확보하는 Park et al.
	월파량의 증가, 감소하는 요인은 무엇인가?	(1) 월파량에 대해, 유수실 폭이 넓을수록 월파량이 감소하며, 입사파고가 클수록 또는 주기가 길수록 월파량은 증가한다.
	TTP 표면에 부착되는 미끄러운 해조류로 인해 유발되는 사고는?	(2017)에 따르면 2014년 실족으로 인한 추락사고가 총 95건(이 중에 사망사고는 26명), 2015년에 실족으로 인한 추락사고가 총 100여건(이 중에 사망사고는 약 20%)이 발생하였다. 이러한 안전사고는 TTP 표면에 부착되는 미끄러운 해조류에 의한 실족사고와 반사율의 저감을 위해 TTP 사이에 형성된 공극으로의 추락사고, 경우에 따라서는 사망사고로도 이어지는 불상사가 빈번히 발생하고 있다. 그리고, 매년 반복되는 폭풍파랑의 내습으로 중력식 호안 및 중력식 방파제에 피복된 TTP의 안정중량 부족으로 인한 산란과 기초지반의 세굴 등으로 인한 TTP의 활동으로 전술한 안전문제는 보다 악화되고, 또한 경관상에 악영향을 주면서 친수공간으로의 이미지가 저하되어 사용자 측면에서 악영향을 초래한다.

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