논문실적
| Flow-Induced Vibration Prediction for a Sliding Roller Gate by Two-dimensional Unsteady CFD Simulation |
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학술지명 미국기계학회 유체공학부문(ASME 2013 FED)
저자 조용,이계복
발표일 2013-07-11
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Flow-induced vibration for the sliding roller gate of the Yellow Sea water gate in Gyeong-in Ara Waterway has been predicted by 2-dimensional unsteady CFD simulation when sea water flows into the port in the river. The time step of 5×10-4 sec is used for the unsteady calculation, and the sampling data each time step makes the Nyquist frequency to be 1,000 Hz. For gate opening of 1.60 m, it is predicted that the averaged velocity at the gate passage is 2.28 m/s, and the flow velocity after the gate increases to 3.69 m/s due to the narrow flow passage. Flow separation at the under leading edge of the gate and the shear layer between inflow sea water and river water are supposed to be fundamental vibration factor. As the gate opening ratio increases, the predicted vibration frequency increases to 10.60 Hz which doesn't reach the estimated natural frequency of the gate of 12.5~15.5 Hz. |
