• Title/Summary/Keyword: 유한체적법

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Numerical Study on the Thermal Model of High Power Density Welding (고에너지 밀도용접의 온도특성에 관한 수치해석적 연구)

  • 이성호;고상근
    • Journal of Welding and Joining
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    • v.10 no.2
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    • pp.19-31
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    • 1992
  • A numerical study was performed to investigate the flow field and the heat transfer characteristics occurring in high power density welding which is important in many fields of engineering applications. A two dimensional quasi-steady state of keyhole welding model is simulated by using the finite volume methods. It is shown that the shape of isothermal line is elliptic and the temperature gradient is very steep compared with other welding method and the welding speed has on welding width and observed beam power.

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Flow Measurement and Analysis of the Waterjet Duct (물분사추진기 관내 유동계측 및 유동해석)

  • 왕정용;최희종;전호환;차상명
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.05a
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    • pp.240-243
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    • 2001
  • 괘도차량에 부착된 물분사추진기의 유동해석을 실험과 포텐셜해석 그리고 점성해석을 사용하여 그 결과를 비교하였다. 예인수조에서 여러 차량 전진속도에 대해서 임펠러 회전수를 조정하여 제트속도를 변화시키면서 덕트표면에서의 정압을 계측하였다. 이는 제트시스템의 효율을 추정하기 위함이고 관로를 통한 에너지분포를 알 수 있다. 점성유동해석을 위해 지배방정식은 비압축성 Navier-Stokes 방정식을 유한체적법을 사용하여 이산화하고 해석하였으며 난류영향은 표준 ĸ-$\varepsilon$난류모형을 사용하여 유동을 해석하고 실험결과 및 포텐셜 해석결과와 비교하였다.

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비정렬격자 모델에 기반한 콜럼비아 강에서의 유출유 모델링

  • Jeong, Yeon-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2011.06a
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    • pp.222-224
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    • 2011
  • 본 연구에서는 유한체적법과 함께 비정렬 격자(Unstructured Grid) 를 채택한 SELFE 모델을 기반으로 운영되는 유출유 확산모델을 개발하였다. 모델의 적용성을 검토하기 위해 미극 오레건주 콜롬비아 강의 유출유 모델링에 적용하였으며 양호한 결과를 얻을 수 있었다. 앞으로 이 모델은 하천, 호수 및 해양을 포함한 다양한 수계에 적용이 가능할 것으로 기대된다.

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A Locally Linear Reconstruction scheme on arbitrary unstructured meshes (임의의 비정렬 격자계에서의 국지적 선형 재구성 기법)

  • Lee K. S.;Baek J. H.
    • 한국전산유체공학회:학술대회논문집
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    • 2003.08a
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    • pp.31-36
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    • 2003
  • A field reconstruction scheme for a cell centered finite volume method on unstructured meshes is developed. Regardless of mesh quality, this method is exact within a machine accuracy if the solution is linear, which means it has full second order accuracy. It does not have any limitation on cell shape except convexity of the cells and recovers standard discretization stencils at structured orthogonal grids. Accuracy comparisons with other popular reconstruction schemes are performed on a simple example.

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Thermal Diffusion Process Modeling with Adaptive Finite Volume Method (적응성 유한체적법을 적용한 다차원 확산공정 모델링)

  • 이준하;이흥주
    • Journal of the Semiconductor & Display Technology
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    • v.3 no.3
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    • pp.19-21
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    • 2004
  • This paper presents a 3-dimensional diffusion simulation with adaptive solution strategy. The developed diffusion simulator VLSIDIF-3 was designed to re-refine areas. Refine scheme was calculated by the difference of doping concentration between any of two nodes. Each element is greater than tolerance and redo diffusion process until error is tolerable. Numerical experiment in low doping diffusion problem showed that this adaptive solution strategy is very efficient in both memory and time, and expected this scheme would be more powerful in complex diffusion model.

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적응성 유한체적법을 적용한 다차원 확산공정 모델링

  • 이준하;이흥주;변기량
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • 2004.05a
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    • pp.55-58
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    • 2004
  • This paper presents a 3-dimensional diffusion simulation with adaptive solution strategy. The developed diffusion simulator VLSIDIF-3 was designed to re-refine areas where difference of doping concentration between any of two nodes of each element is greater than tolerance and redo diffusion process until error is tolerable. Numerical experiment in low doping diffusion problem showed that this adaptive solution strategy is very efficient in both memory and time, and expected this scheme would be more powerful in complex diffusion model.

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A Study on the Improvement of Anti-abrasion Nature of Curved Ducts for High-velocity Particle-laden Gas Flow (고속 분립체 이송용 곡관의 내마모성 향상에 관한 연구)

  • 권동구;김윤제
    • Journal of Energy Engineering
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    • v.10 no.1
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    • pp.33-39
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    • 2001
  • 석탄화력발전소에 정착되는 고속분립체 이송용 곡관의 내마모성 향상에 관한 수치해석 및 실험적 연구를 수행하였다. 22.5$^{\circ}$와 90$^{\circ}$ 곡관을 모델로 하여, 분립체에 의한 곡관의 마모를 감소시키기 위해 유동방향이 전환되는 부분에 와류장이 형성되도록 곡관의 단면형상을 변화시켰다. 삼차원, 난류유동장의 지배방정식을 유한체적법으로 이산화시키고, SIMPLE 알고리즘을 이용하여 해를 구하였다. 수치해석을 통해 마모감소를 위한 새로운 형상의 곡관을 설계하였다. 새로운 형상의 곡관을 제작, 운전중인 국내 화력발전소에 장착하여 마모실험을 수행하였으며 내마모성이 매우 향상되었음을 알 수 있었다.

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Study on effect of control functions according to interpolations for elliptic grid generation method (해석적 자동격자생성방법에서 보간방법에 따른 조절함수의 영향에 관한 연구)

  • Chae E. M.;Sah J. Y.
    • Journal of computational fluids engineering
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    • v.1 no.1
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    • pp.9-18
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    • 1996
  • This study examines effect of various interpolations of interior control function for analytic methods such as Thomas-Middlecoff and Sorenson methods. Laplace interpolation is developed and compared among linear interpolation and exponential interpolation systematically.

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Study on effect of control functions according to interpolations for elliptic grid generation method (해석적 자동격자생성방법에서 보간방법에 따른 조절함수의 영향에 관한 연구)

  • Chae Eun-Mi;Sah Jong-Youb
    • 한국전산유체공학회:학술대회논문집
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    • 1995.10a
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    • pp.104-109
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    • 1995
  • This study examines effect of various interpolations of interior control function for analytic methods such as Thomas-Middlecoff and Sorenson methods. Laplace interpolation is developed and compared among linear interpolation and exponential interpolation systematically.

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Numerical Analysis of Turbulent Flows in the Scroll Volute of Centrifugal Compressor (벌류트 압축기내의 난류유동 수치해석)

  • Kwag, Seung-Hyun
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.6
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    • pp.681-686
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    • 2007
  • The flow analysis was made by applying the turbulent models in the scroll volume of centrifugal compressor. The $k-{\varepsilon}.\;k-{\omega}$, Spalart-Allmaras and reynolds stress models are used in which the hybrid grid is applied for the simulation. The velocity vector the Pressure contour. the change of residual along the iteration number. and the dynamic head are simulated by solving the Navier-Stokes equations for the comparison of four example cases.