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김낙근 ( Nak Geun Kim ),이계복 ( Kye Bock Lee ) 충북대학교 건설기술연구소 2012 建設技術論文集 Vol.31 No.1
항구로 바닷물이 들어올 때 수문의 자려 진동은 수문 아래의 와류에 수문의 자려진동을 예측하기 위해 2차원 비정상 유동 특성을 수치적으로 해석하였다. 의해 발생하는 것을 확인하였다. 진동수와 평균속도에 대한 수문개도의 영향과 수문 아래에 발생하는 와류에 대해 연구하였다. 수문 개도가 증가할수록, 진동수는 감소하였다. Numerical analysis on the flow induced vibration in the water gate has been carried out by 2-dimensional unsteady CFD simulation when sea water flows into the port in the river. The results show that the sources of disturbed frequency are the vortex shed from the bottom of the water gate. Effect of gate opening on the frequency and the mean velocity and the vortex shed from under the water gate were studied. As the gate opening ratio increases, the predicted vibration frequency decreases.
이계복 ( Kye Bock Lee ),조용 ( Yong Cho ) 충북대학교 건설기술연구소 2014 建設技術論文集 Vol.33 No.1
항구로 바닷물이 들어올 때 수문개도와 수위차에 따른 수문하부의 유동특성과 자려진동을 2차원 비정상 상태로 수치적으로 해석하였다. 진동수에 대한 결과는 수문아래의 외류에 의해 발생하였다. 수문 하부에서 발생하는 역류와 전단력, 와유출 등의 유동특성을 분석하였고 수문 개도가 증가할수록, 진동수는 감소하였다. 수문의 고유진동수에 근접하는 수위차와 수문개도의 유동조건을 예측하였다. The goal of the present work is to investigate the flow characteristics under the water gate and the flow induced vibration by 2-dimensional unsteady CFD simulation for different opening gaps of the water gate and the wawter level differences. The flow characteristics such as velocity profile. shear stress and vortex shedding under the water gate are analyzed. As the gate opening gap increases, the oscillated frequency decreases. The prediction results show the dangerous operating conditions on the gate opening gap and the water level difference which could be resonant.
최창용 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.1
Among the various causes of the vibration problem of the radial sluice gate used in Saemangeum, the effect of flow-induced vibration was studied by the method of computational fluid analysis. In this study, the effect on the flow-induced vibration of the Saemangeum radial sluice gate was evaluated by 2D unsteady flow numerical analysis using ANSYS Fluent. Gate opening cases of 0.2m, 0.3m, 0.4m, 0.5m, and 1.0m were analyzed. As a result, the flow-induced vibration characteristics due to the instability of turbulent flow were observed through FFT analysis. As the gate opening increases, the frequency of the maximum amplitude moves gradually to a lower frequency region with the reduction of the magnitude. Therefore the flow-induced vibration effects can be considered as small with the gate opening increase.