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논문 기본 정보

자료유형
학술저널
저자정보
신상묵 (부경대학교)
저널정보
대한조선학회 대한조선학회 논문집 대한조선학회논문집 제55권 제1호(통권 제217호)
발행연도
2018.2
수록면
56 - 65 (10page)
DOI
10.3744/SNAK.2018.55.1.56

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초록· 키워드

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Pressure oscillation caused by the compressibility of entrapped air in dam break flow is analyzed using an open source code, which is a two-phase compressible code for non-isothermal immiscible fluids. Since compressible flows are computed based on a pressure-based method, the code can handle the equation of state of barotropic fluid, which is virtually incompressible. The computed time variation of pressure is compared with other experimental and computational results. The present result shows good agreements with other results until the air is entrapped. As the entrapped air bubbles pulsate, pressure oscillations are predicted and the pressure oscillations damp out quickly. Although the compressibility parameter of water has been varied for a wide range, it has no effects on the computed results, because the present equation of state for water is so close to that of incompressible fluid. Grid independency test for computed time variation of pressure shows that all results predict similar period of pressure oscillation and quick damping out of the oscillation, even though the amplitude of pressure oscillation is sensitive to the velocity field at the moment of the entrapping. It is observed that as pressure inside the entrapped air changes quickly, the pressure field in the neighboring water adjusts instantly, because the sound of speed is much higher in water. It is confirmed that the period of pressure oscillation is dominated by the added mass of neighboring water. It is found that the temperature oscillation of the entrapped air is critical to the quick damping out of the oscillations, due to the fact that the time averaged temperature inside the entrapped air is higher than that of surrounding water, which is almost constant.

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1. 서론
2. 수치해석 기법
3. 다상 압축성 유동 해석 코드를 이용한 댐 붕괴 유동 모사
4. 댐 붕괴 유동 크기에 따른 압력 진동 특성 변화
5. 결언
References

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UCI(KEPA) : I410-ECN-0101-2018-538-001764638