• 한국전산유체공학회지
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• 제4권2호
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• pp.39-46
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• 1999

The FVM(Finite Volume Method) have been used mainly for the flow analyses in the piston-cylinder. The objective of the present study is to analyze numerically the piston-driven intake flows using the FEM(Finite Element Method). The FEM algorithm used in this study is 4-step time-splitting method which requires much less execution time and computer storage than the velocity-pressure integrated method and the penalty method. And the explicit Lax-Wendroff scheme is applied to nonlinear convective term in the momentum equations to prevent checkerboard pressure oscillations. Also, the ALE(arbitrary Lagrangian Eulerian) method is adopted for the moving grids. The calculated results show good agreement in comparison with those by the FVM and the experimental results by the LDA.

• 대한기계학회논문집B
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• 제22권12호
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• pp.1796-1804
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• 1998

A numerical investigation has been performed to discuss the radiation-affected steady-laminar natural convection induced by a hot inner cylinder under a large temperature difference in the annuli filled with a gray gas. To examine the effects of thermal radiation on thermo-fluid dynamic behaviors in the eccentric geometry, the generalized body-fitted coordinate system is introduced while the finite volume method (FVM) is used for solving the radiative transport equation. After validating the numerical results for the case without radiation, the detailed radiation effect has been discussed. Based on the results of this study, when there exists a large temperature difference between two cylinders, the existence of radiatively participating medium is found to incur a distinct difference in fluid dynamic as well as thermal behavior.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 춘계 학술대회논문집
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• pp.53-57
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• 2007

The quality of chaotic mixing in square cavity flow was studied numerically by CFD simulation and particle tracking technique. The chaotic mixing was generated by using time-periodic electro-osmotic flow. Finite Volume Method (FVM) was employed to get the stretching and folding field in cavity domain. With adjusting the initial condition of concentration distribution, the best values of modulation period and Peclet number which gave us good mixing performance was determined precisely. From $Poicar{\acute{e}}section$and Lyapunov exponents for characteristic trajectories we find that mixing performance also depends on modulation period. The higher value of modulation period, the better mixing performance wag achieved in this case. Furthermore, the results for tracking particle trajectories were also compared between using of Bilinear Interpolation and Higher-order scheme. The values of modulation period for obtaining best mixing effect were matched between using FVM and particle tracking techniques.

• 대한기계학회논문집B
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• 제20권2호
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• pp.649-658
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• 1996

Small-amplitude harmonic oscillations of multi-cylinders are considered both experimentally and theoretically. For the theoretical model, the flow regime is separated into inner and outer regions. In the inner region, the flow is governed by the generalized Stokes boundary layer equation. In the outer region, the full Navier-Stokes equation for the steady streaming flow is solved numerically by using ADI scheme and FVM coupled with the boundary integral method. Flow visualization experiments are conducted by using the Laser Sheet Image Technique. The case of two circular cylinders and square cylinders with variable distances are chosen as a typical example. Although experimental results are based on the flow in the finite domain, both experimental and numerical results agree well qualitatively. As the separation of cylinders is increased, a numerical result shows the asymptotic convergence to a single cylinder case.

• Journal of Electrical Engineering and Technology
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• 제7권3호
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• pp.384-388
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• 2012

Finite Volume Method (FVM) is chosen to calculate the heat transfer field and the heat generation with in the cable and heat dissipation in the surrounding soil of a three phase 145kV underground cable brunch that make it possible to analyze the ampacity of the cable. FLUENT as the proper software in this field is used to generate and solve the problem. Non-homogenous environment is considered for cable ampacity calculation and results are compare with homogenous environment condition.

• Structural Engineering and Mechanics
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• 제80권5호
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• pp.553-562
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• 2021

In this paper, a hybrid scaled boundary finite element and finite volume method (SBFEM-FVM) is proposed for simulating hydraulic-fracture propagation in brittle concrete materials. As a semi-analytical method, the scaled boundary finite element method is introduced for modelling concrete crack propagation under both an external force and water pressure. The finite volume method is employed to model the water within the crack and consider the relationship between the water pressure and the crack opening distance. The cohesive crack model is used to analyse the non-linear fracture process zone. The numerical results are compared with experimental data, indicating that the F-CMOD curves and water pressure changes under different loading conditions are approximately the same. Different types of water pressure distributions are also studied with the proposed coupled model, and the results show that the internal water pressure distribution has an important influence on crack propagation.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2021년도 추계학술발표대회
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• pp.423-425
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• 2021

전기 자동차 에너지 시스템을 개발하기 위해서는 열 유체-전자기장 연성해석이 필요하다. 이를 위해 열 유체와 전자기장 각각의 해석에 특화된 패키지들을 사용하고, 이 패키지의 실험 결과를 저장 장치를 통해 주고받는다. 하지만 이는 저장장치 I/O 횟수를 늘려서 전체 계산 과정을 느리게 만들 수 있다. 데이터 교환을 MPI 패키지를 이용하여 DRAM 을 통해 이루어지도록 만들 수 있지만, 이는 계산 결과의 지속성을 악화시킨다. 즉, 열 유체 및 전자기장 연산과정에서 속도와 결과의 지속성은 상충적인 관계 갖는다. 본 연구는 이러한 관계를 실험적으로 분석하고 데이터의 지속성을 완화했을 때 이에 의해 얻을 수 있는 성능 이익을 분석한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2003년도 학술발표회논문집(1)
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• pp.501-504
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• 2003

No Abstract, See Full Text

• 한국컴퓨터정보학회논문지
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• 제19권1호
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• pp.65-76
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• 2014

본 연구는 패킷 처리를 위한 고급 프로그래밍언어 eFlow를 제안하고 이를 지원하는 개발환경을 구현한다. 또한 개발자들이 가장 익숙하고 배우기 쉬운 C 언어를 기반으로 하여 C 언어의 문법과 의미를 유지하면서, 패킷 처리에 불필요한 기능들을 제거하고 패킷 처리에 필요한 패킷 데이터, 데이터베이스 및 스트링 바이트 정보 검사, 이벤트 처리 등을 수행하기 위한 고급 프로그래밍 언어를 설계하고, 기존의 언어나 컴파일러 기술을 적용하면서 패킷 처리를 위해 필요한 언어의 기능과 컴파일 과정을 설명한다. X11 등과 같은 DPIC 장비에 활용하기 위해 이식성과 확장성을 고려한 가상 기계인 eFVM을 설계하고, 이를 위한 컴파일러와 시뮬레이터 및 디버거와 같은 개발 환경을 갖추어 실제 많이 사용되고 있는 다양한 응용 프로그램을 실험하여 제안한 언어의 효용성을 평가하고 있다. 패킷 처리를 위해 갖추어야 할 고급 언어의 기능과 형식 및 그 의미를 정의한 연구가 거의 없이 이루어진 실험에 의의가 있다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 춘계학술대회
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• pp.447-447
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• 2005