• Title/Summary/Keyword: 전산유체역학

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Building and Benchmarking of Linux Cluster Systems for Computational Fluid Dynamics (전산유체역학 고속 연산을 위한 리눅스 클러스터의 구현 및 성능평가)

  • Lee Bo-sung
    • 한국전산유체공학회:학술대회논문집
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    • 1999.11a
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    • pp.201-206
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    • 1999
  • 현재 전세계적으로 과한 기술 연산용 리눅스 클러스터에 대한 연구와 개발이 진행되고 있는 추세이다. 본 논문에서는 펜티엄 프로세서와 알파 프로세서 및 고속 이더넷을 이용한 리눅스 클러스터를 구현하고 이를 전산유체역학 분야에 적용하기 위한 선행연구로서 NAS의 병렬 벤치마크 프로그램인 NPB를 사용하여 리눅스 클러스터들의 성능을 비교 분석하였다. NPB 프로그램은 전산유체역학 분야의 해석프로그램에서 널리 이용되는 알고리즘들로 구성된 벤치마크의 프로그램으로 이를 이용한 성능 평가의 결과는 향후 리눅스 클러스터에서 실제 전산유체역학 코드들의 성능을 나타내는 중요한 지표가 될 수 있다. NPB 벤치마크 결과 리눅스 클러스터는 고가의 슈퍼컴퓨터에 비해 전산유체역학 분야에서 높은 가격 대 성능비를 보임을 알 수 있으며 이를 통하여 저비용 슈퍼컴퓨팅의 가능성을 제시하고자 한다.

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Comparative Study of Commercial CFD Software Performance for Prediction of Reactor Internal Flow (원자로 내부유동 예측을 위한 상용 전산유체역학 소프트웨어 성능 비교 연구)

  • Lee, Gong Hee;Bang, Young Seok;Woo, Sweng Woong;Kim, Do Hyeong;Kang, Min Ku
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.12
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    • pp.1175-1183
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    • 2013
  • Even if some CFD software developers and its users think that a state-of-the-art CFD software can be used to reasonably solve at least single-phase nuclear reactor safety problems, there remain limitations and uncertainties in the calculation result. From a regulatory perspective, the Korea Institute of Nuclear Safety (KINS) is presently conducting the performance assessment of commercial CFD software for nuclear reactor safety problems. In this study, to examine the prediction performance of commercial CFD software with the porous model in the analysis of the scale-down APR (Advanced Power Reactor Plus) internal flow, a simulation was conducted with the on-board numerical models in ANSYS CFX R.14 and FLUENT R.14. It was concluded that depending on the CFD software, the internal flow distribution of the scale-down APR was locally somewhat different. Although there was a limitation in estimating the prediction performance of the commercial CFD software owing to the limited amount of measured data, CFX R.14 showed more reasonable prediction results in comparison with FLUENT R.14. Meanwhile, owing to the difference in discretization methodology, FLUENT R.14 required more computational memory than CFX R.14 for the same grid system. Therefore, the CFD software suitable to the available computational resource should be selected for massively parallel computations.

전산유체역학을 이용한 고 레이놀즈수 유동에서의 탠덤 에어포일 상대 위치 인자 연구

  • Jang, Gi-Won
    • Proceeding of EDISON Challenge
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    • 2016.03a
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    • pp.523-529
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    • 2016
  • 본 연구에서는 전산유체역학을 이용하여 고 레이놀즈수에 유동에서의 탠덤 에어포일에 대한 상대 위치 인자 연구를 진행한다. 탠덤형 날개의 경우 앞뒤 날개의 유동간섭이 날개 성능에 중요한 영향을 미친다. 본 연구에서는 이를 2차원 탠덤 에어포일로 고려하여 유동간섭을 확인한다. 유동간섭에 따른 에어포일 성능을 분석함으로써 뒤 에어포일의 상대 위치를 결정할 수 있으며, 본 연구결과는 실제 탠덤 날개 형태의 항공기 설계에 유용하게 이용될 수 있을 것으로 기대된다.

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Performance Analysis of Cluster Network Interfaces for Parallel Computing of Computational Fluid Dynamics (전산유체역학 병렬해석을 위한 클러스터 네트웍 장치 성능분석)

  • Lee Bo-sung;Hong Jeong-Woo;Lee Sangsan;Lee Dong Ho
    • 한국전산유체공학회:학술대회논문집
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    • 2002.05a
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    • pp.152-157
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    • 2002
  • 전산유체역학분야의 고속 연산을 위해서 병렬처리가 보편화되고 있으며 이러한 병렬해석은 주로 클러스터에서 저렴한 비용으로 수행되고 있다. 전산유체역학을 위한 클러스터 컴퓨터에서의 해석프로그램의 성능은 클러스터에 사용되는 프로세서의 성능뿐만 아니라 클러스터 내부의 통신 장비의 성능에 크게 좌우된다. 본 논문에서는 클러스터 컴퓨터의 구축에 널리 사용되고 있는 Myrinet2000, Gigabit Ethernet, Fast Ethernet 등의 네트웍 장치에 대해서 Netpipe, Linpack, NAS NPB, 그리고 MPINS2D Navier-Stokes 해석프로그램을 사용하여 성능을 비교하였다. 이를 통해서 향후 전산유체역학을 위한 클러스터 구축시 최대의 가격대 성능비를 얻을 수 있는 방법을 제시하고자 한다.

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선박의 무게중심 변화에 따른 안정성 해석에 관한 수치 시뮬레이션 - 세월호 침몰을 교훈으로 -

  • Park, Jong-Cheon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2014.06a
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    • pp.11-12
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    • 2014
  • 본 연구에서는 일정속도로 항행하는 선박의 후미에서 20도의 각도로 진행하는 뒤파도가 존재할 경우, 선박의 무게중심 변화에 따른 안정성 해석에 대해 전산유체역학(CFD) 기술을 이용하여 운동 시뮬레이션을 수행하였다.

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Assessment of CFD Estimation Capability for the Local Loss Coefficients of Sudden Contraction and Expansion (급격 확대 및 축소관의 압력손실계수에 대한 전산유체역학 해석의 예측성능 평가)

  • Kim, Hyun-Jung;Park, Jong-Pil
    • Applied Chemistry for Engineering
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    • v.21 no.3
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    • pp.258-264
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    • 2010
  • Most of fluid systems, such as P&ID in ships, power plants, and chemical plants, consist of various components. The components such as bends, tees, sudden-expansions, sudden-contractions, and orifices contribute to overall pressure loss of the system. The local pressure losses across such components are determined using a pressure loss coefficient, k-factor, in lumped parameter models. In many engineering problems Idelchik's k-factor models have been used to estimate them. The present work compares the k-factor based on CFD calculation against Idelchik's model in order to confirm whether a commercial CFD package can be used for pressure loss coefficient estimation of complex geometries. The results show that RSM is the best appropriate for evaluating pressure loss coefficient. Commercial CFD package can be used as a tool evaluating k-factor even though the accuracy is influenced by a turbulence model.

Numerical Analysis of Turbulent Flow around Tube Bundle by Applying CFD Best Practice Guideline (CFD 우수사례 지침을 적용한 관 다발 주위의 난류유동 수치해석)

  • Lee, Gong Hee;Bang, Young Seok;Woo, Sweng Woong;Cheng, Ae Ju
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.37 no.10
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    • pp.961-969
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    • 2013
  • In this study, the numerical analysis of a turbulent flow around both a staggered and an inline tube bundle was conducted using ANSYS CFX V.13, a commercial CFD software. The flow was assumed to be steady, incompressible, and isothermal. According to the CFD Best Practice Guideline, the sensitivity study for grid size, accuracy of the discretization scheme for convection term, and turbulence model was conducted, and its result was compared with the experimental data to estimate the applicability of the CFD Best Practice Guideline. It was concluded that the CFD Best Practice Guideline did not always guarantee an improvement in the prediction performance of the commercial CFD software in the field of tube bundle flow.

A fast reconstruction technique for nonlinear ocean wave simulation (비선형 해양파 수치 모사를 위한 고속 재현 기법)

  • Lee, Sang-Beom;Choi, Young-Myung
    • Journal of the Institute of Convergence Signal Processing
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    • v.23 no.1
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    • pp.15-20
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    • 2022
  • An improvement of computational resources with a large scale cluster service is available to the individual person, which has been limited to the original industry and research institute. Therefore, the application of powerful computational resources to the engineering design has been increased fast. In naval and marine industry, the application of Computational Fluid Dynamics, which requires a huge computational effort, to a design of ship and offshore structure has been increased. Floating bodies such as the ship or offshore structure is exposed to ocean waves, current and wind in the ocean, therefore the precise modelling of those environmental disturbances is important in Computational Fluid Dynamics. Especially, ocean waves has to be nonlinear rather than the linear model based on the superposition due to a nonlinear characteristics of Computational Fluid Dynamics. In the present study, a fast reconstruction technique is suggested and it is validated from a series of simulations by using the Computational Fluid Dynamics.

Information Technology and Computational Fluid Dynamics (정보통신기술과 전산유체역학)

  • Cho Kum Won;Park Hyungwoo;Lee Sangsan
    • Journal of computational fluids engineering
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    • v.6 no.3
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    • pp.51-56
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    • 2001
  • As IT(Information Technology) has been developing, an application engineering is advanced so quickly. Especially, CFD field that is influenced greatly by Computing Power is an outstanding example. In this paper, it says a research tendency of the KISTI Supercomputing Center that performs the CFD research based on IT. The representative researches are the National Grid Project, TeraCluster Construction and development and a supporting plan for Supercomputer users' parallelization.

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Computational Fluid Dynamics Research based on National Grid Project (국가 그리드 구축을 통한 전산유체역학 연구)

  • Cho Kum Won;Park Hyungwoo;Lee Sangsan
    • 한국전산유체공학회:학술대회논문집
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    • 2001.10a
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    • pp.174-181
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    • 2001
  • The Gird is a communication service that collaborates dispersed high performance computers, large-scale databases and modern equipments so that those can be shared and worked together. In this paper. CFD research based on National Grid project is discussed. To validate the Grid technology, the flow past ONERA M6 wing and the flow past infinite wing are simulated on the National Grid testbed.

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