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다양한 PC 클러스터 시스템 환경에서 CFD 코드의 성능 분석
조금원(K. W. Cho),홍정우(J. Hong),이상산(S. Lee) 한국전산유체공학회 2001 한국전산유체공학회지 Vol.6 No.2
In recent years cluster systems using off-the-shelf processors and networks components have been increasing popular. Since actual performance of a cluster system varies significantly for different architectures, representative in-house codes from major application fields were executed to evaluate the actual performance of systems with different combination of CPU, network, and network topology. As an example of practical CFD(Computational Fluid Dynamics) simulations, the flow past an Onera - M6 wing and the flow past an infinite wing were simulated on clusters of Linux and several other hardware environments.
자바 애플릿을 이용한 2차원 혼합형 비정렬 격자 생성 프로그램의 개발
이장훈(J.H. Lee),조금원(K.W. Cho),김병수(B.S. Kim) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.11
In this paper a hybrid grid generation program for general 2-D region is introduced. The program is developed by using JAVA programming language, and it can be used either as an application program on a local computer or as an applet in the network environment. The hybrid grid system for a 2-D problem means a combination of triangular cells and quadrilateral cells, and it can offer both of the high flexibility of triangular cells and the high accuracy and efficiency of structured-type quadrilateral cells. To accommodate a quadrilateral-cell region and a triangular-cell region into one computational domain, it is importance to take good care of the interface between two different regions so that overall good grid quality can be maintained. In this research advancing layer method(ALM) augmented by elliptic smoothing method is used for the quadrilateral-cell region and advancing Font method(AFM) is used for the triangular-cell region. A special treatment technique for the interface between those two regions is also developed. The interface treatment technique is basically to prevent the propagation of small cell size due to ALM method into the triangular region and maintain the smooth transition of cell-size scale between two different regions. By applying current technique high-quality hybrid grids for general 2-D regions can be easily generated, and typical grid generation results and flow solutions are demonstrated.
TeraCluster에서 CFD 코드의 병렬 성능 분석
조금원(K.W. Cho),이상산(S. Lee) 한국전산유체공학회 2000 한국전산유체공학회 학술대회논문집 Vol.2000 No.10
At the end of 1999. the TeraCluster project has started in the KORDIC Supercomputer center to study PC. dusters for parallel computing. The aim is to replace the Cray T3E with a new cluster system in 2002. The PC cluster without a fast network is well suited for applications which do not require large amount of global communications. Since CFD problems are not very communication intensive, whole test cluster may be efficiently used. As an example of practical CFD simulations, the flow past the ONERA M6 wing and the flow past infinite wing are simulated on a cluster of Linux workstations.
비정상 Euler 방정식을 이용한 Chimera 기법의 병렬처리에 관한 연구
조금원(K.W. Cho),권장혁(J.H. Kwon),이승수(S. Lee) 한국전산유체공학회 1999 한국전산유체공학회지 Vol.4 No.3
The development of a parallelized aerodynamic simulation process involving moving bodies is presented. The implementation of this process is demonstrated using a fully systemized Chimera methodology for steady and unsteady problems. This methodology consists of a Chimera hole-cutting, a new cut-paste algorithm for optimal mesh interface generation and a two-step search method for donor cell identification. It is fully automated and requires minimal user input. All procedures of the Chimera technique are parallelized on the Cray T3E using the MPI library. Two and three-dimensional examples are chosen to demonstrate the effectiveness and parallel performance of this procedure.
중첩격자계에서 교차영역 구성에 따른 시간/공간 정확도에 관한 연구
조금원(K.W. Cho),권장혁(J.H. Kwon),이승수(S.Lee) 한국전산유체공학회 1999 한국전산유체공학회 학술대회논문집 Vol.1999 No.-
<br/> The spatial error due to the non-conservative interpolation become first-order when second-order conservative schemes are used, discontinuities are located away from the overlapped regions, and if the length of the overlapped region is not proportional to the grid spacing. Therefore, the solution accuracy is ensured if two domains overlap each other with a fixed grid point and the interpolation is occurred in smooth flow regions.<br/> To validate the spatial and temporal accuracy due to the non-conservative interpolation, inviscid and viscous problems are tested.