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PIV 계측과 CFD 해석을 통한 오일펜스 만곡부 단면에서의 유동장 특성
김태호,장덕종,나선철,배재현,김대안,Kim, Tae-Ho,Jang, Duck-Jong,Na, Sun-Chol,Bae, Jae-Hyun,Kim, Dae-An 해양환경안전학회 2011 해양환경안전학회지 Vol.17 No.1
유속의 변화에 따른 오일펜스 만곡부 후면의 속도장과 압력장, 와도 및 난류 강도를 계측한 PIV 실험의 결과 유속이 증가함에 따라 유동 경계역의 후면부에서의 흐름 방향이 전면부의 흐름 방향에 가까워지는 현상이 나타났고, 압력 분포의 양상이 달라졌으며 난류도 더욱 불규칙적인 형태로 나타났다. PIV 실험과 동일 조건으로 수행한 CFD 해석 결과, 후류의 유동 패턴이 0.3m/s이하의 저속인 경우는 PIV 실험 결과와 유사하게 나타났으나, 유속이 0.4m/s일 때는 오일펜스 자체의 유연성으로 인해 다소 차이가 나타났고, 오일펜스 하단의 압력차로 인한 불규칙한 난류가 수면까지 영향을 주었다. PIV measurements of the velocity field, pressure field, vorticity, and turbulent intensity in the rear of curved section of an oil fence with current speed showed that the flow directions in the rear of flow boundary area were similar to those in the front of it. As the current speed increased, the patterns of pressure distribution were changed, and the turbulent flow became more irregular. CFD simulations under the same conditions as the PIV tests showed that the flow patterns of the wake were similar to those by PIV tests in speed of 0.3 m/s and less, but were distinctively deviated from those in 0.4 m/s due to the flexibility of the oil fence, which was not properly taken care of in CFD modeling.
김태호(Tae Ho KIM),장덕종(Duck Jong JANG),양경욱(Kyong Uk YANG),김대안(Dae An KIM),나선철(Sun Chol NA) 전남대학교 수산과학연구소 2009 수산과학연구소논문집 Vol.18 No.1
In order to investigate the spreading performance of model canvas plates of spreading devices for oil fence by aspect ratios and spreading force FL and drag FD acting on them in a circulating water channel, 3 types of rectangular canvas plates with aspect ratios of 1/1.2, 1, and 1.2, respectively were manufactured. FL and FD is described as FL=CL(1/2)pSv² and FD=CD(1/2)pSv², where p is water density, S is the projected area of canvas, and v is current speed, respectively. The maximum spreading force coefficients CL at current speed of 0.2, 04 and 0.6 m/s were 1.5-1.6 at attack angle of 32-38° in case of aspect ratio with 1/1.2, 1.7-1.8 at attack angle of 38-44° in case of aspect ratio with 1, and 1.8-1.9 at attack angle of 40-46° in case of aspect ratio with 1.2, respectively. In addition, the ratios of CL to CD were 1.41 in case of aspect ratio with 1/1.2, 2.01 in 1, and 2.0, and 3-3.4 in 1.2, respectively.