• Journal of computational fluids engineering
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• v.13 no.1
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• pp.7-13
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• 2008

Several high resolution schemes such as OSHER, MUSCL, SMART, GAMMA, WACEB and CUBISTA are comparatively studied with respect to the accurate capturing of fluid interfaces throughout the application to two typical test cases of a translation test and a collapsing water column problem with a return wave. It is accomplished by implementing the high resolution schemes in the in-house CFD code(PowerCFD) for computing 3-D flow with an unstructured cell-centered method and an interface capturing method, which is based on the finite-volume technique and fully conservative. The calculated results show that SMART scheme gives the best performance with respect to accuracy and robustness.

• 한국전산유체공학회:학술대회논문집
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• 2006.10a
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• pp.51-56
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• 2006

Several high resolution schemes such as OSHER, MUSCL, SMART, GAMMA, WACEB and CUBISTA are applied to two typical test cases of a translation test and a collapsing water column problem for the accurate capturing of fluid interfaces. It is accomplished by implementing the high resolution schemes in the in-house CFD code(PowerCFD) for computing 3-D flow with an unstructured cell-centered method, which is based on the finite-volume technique and fully conservative. The calculated results are found to show that SMART scheme gives the best performance with respect to accuracy and robustness.

• Proceedings of the Korean Society for Language and Information Conference
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• 2001.06a
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• pp.77-94
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• 2001

본 논문은 영어에 있어 부사의 분포를 통사-의미론적으로 설명함을 목적으로 한다. 영어부사의 분포는 표면상 문장 내에서 매우 자유로운 듯하여 이 분포의 자유가 부사의 이동에 기인한다는 주장도 나왔으나, 본고에서 저자는 의미상 그리고 하위범주화상 부사의 이동은 있을 수 없음을 주장하고, 나아가 부사의 분포는 사실상 자유롭지 않고 매우 제한되어 있다는 언어학자들(Jackendoff(1972), Travis(1988), Cinque(1999))의 자료를 제시했다. 부사는 문장 내의 위치에 제한을 받을 뿐만이 아니라 부사들 사이의 상대적 순서에도 제한을 받는데 본고에서는 여러 학자들의 분석 중 가장 최근의 분석인 Cinque(1999)의 이론을 중점적으로 고찰하고 그 문제점을 지적했다. Cinque의 부사분포를 설명하려는 이론은 지나치게 복잡화된 기능범주투사를 필수요건으로 하는데 이는 통사적으로 너무 많은 값을 치루기에 비경제적이다. 저자는 부사의 의미유형에 따라 영향을 받는 부사의 상대적 순서 효과는 통사적 해결이 아니라 의미유형들의 작용역 관계에 기반한 의미적 해결을 하여야 하며, 부사의 문장 내 분포는 부사를 크게 세 가지 의미유형으로 나누고 이 각각의 의미유형이 최근 Chomsky에서 논의되고 있는 세 가지 국면에 사상된다고 가정하면 포착될 수 있다고 주장하였다.

• Journal of the Society of Naval Architects of Korea
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• v.51 no.4
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• pp.265-273
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• 2014

Wave-body interaction is simulated using a developed code based on the flux-difference splitting scheme for immiscible and incompressible fluids and the hybrid Cartesian/immersed boundary method. A free surface is captured as a moving contact discontinuity within a fluid domain and an approximated Riemann solver is used to estimate the inviscid flux across the discontinuity. Immersed boundary nodes are identified inside an instantaneous fluid domain near a moving body, then dependent variables are reconstructed at those immersed boundary nodes based on interpolation along local normal lines to the boundary. Free surface flows around an oscillating cylinder are simulated and the computed wave elevations are compared with other reported results. The generation of a solitary wave by a moving wave-maker is simulated and the time histories of wave elevations at two different points are compared with other results. The developed code is applied to simulate body motion of an elastically mounted circular cylinder as a solitary wave passes the body. The force acting on an elastically mounted cylinder is compared with the force acting on a fixed cylinder. Grid independency of the computed body motion is established based on a comparison of results using three different-size grids.