• Title/Summary/Keyword: 전산 유체역학

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NOTES FOR AUTHORS OF THE KOREAN SOCIETY OF COMPUTATIONAL FLUIDS ENGINEERING (고차 내삽기법을 사용한 중첩 격자기법)

  • Lee, K.L.;Kim, K.H.
    • 한국전산유체공학회:학술대회논문집
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    • 2007.10a
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    • pp.209-213
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    • 2007
  • This paper presents the high order conservative interpolation methods. This method has been successfully implemented into a cell-centered finite volume methods code. Results using high order and maintaining conservation interpolation method are more accurate compared to bilinear interpolation.

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EXAMPLES OF REDUCED ORDER MODELLING FOR A 3D BACKWARD FACING STEP FLOW USING POD TECHNIQUE (POD를 사용한 3차원 후향계단 유동장 분석 예제)

  • Lee, K.S.;Lee, E.S.
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.40-42
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    • 2010
  • Unsteady CFD results of the backward facing step (BFS) flow field is reconstructed by the low-dimenstional modes using the POD (Proper Orthogonal Decomposition) technique. Flow responses to the blowing or suction with various frequencies and amplitudes applied at the edge of the BFS can also be analysed using the same technique. The present technique can be effectively applied to the feedback flow control device.

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A STUDY OF FLOW CHARACTERISTICS AND DESIGN VARIABLES IN AN LPG INJECTOR (LPG Injector 컷솔 유동 특성 및 설계 변수 연구)

  • Lee, Joon-Sik;Lim, Seol;Kim, Sang-Dug;Song, Dong-Joo
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03a
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    • pp.239-243
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    • 2008
  • Fluid flow in LPG injector is delayed momently around nozzle and leaked accidentally, then engine operation becomes unstable. When attached cutsole injector that we can prevent fuel from leaking. Attaching additional devices cause loss of power and pressure. In this study, We has analyzed the performance of the LPG injector nozzle by changing cutsole geometry numerously by using Computational Fluid Dynamics.

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Evaluation of Dynamic Characteristic of a Globe Valve with Various Plug Types (플러그 형상에 따른 글로브 밸브의 동특성 평가)

  • Ko S. H.;Park S.;Yang S. M.
    • 한국전산유체공학회:학술대회논문집
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    • 2004.10a
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    • pp.29-32
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    • 2004
  • A three dimensional numerical analysis and experimental measurements were made for incompressible flows in a globe valve with three different types of plug. Characteristics of pressure drop across the valve were investigated for each type of plug at various opening positions. Numerical simulation results show a good agreement with experimental data.

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Aerodynamic Analysis of Smart UAV with CFD (CFD를 이용한 스마트 문인기의 공력특성 분석)

  • Kim C. W.;Chung J. D.;Lee J. Y.
    • 한국전산유체공학회:학술대회논문집
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    • 2004.10a
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    • pp.105-109
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    • 2004
  • CFD simulation for Smart-UAV(TR-E2Sl) is performed to analyze its aerodynamic characteristics. Base geometry and several cases, decided by control surfaces being deflected, are simulated. To obtain the better lift characteristics, the elevator should be deflected between 10o and 20o with the incidence angle of the wing 1o.

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A STUDY ON THE STORE SEPARATION PREDICTION TECHNIQUE USING GRID SURVEY METHOD (GRID SURVEY 방법을 이용한 무장분리예측 기법 연구)

  • Kim, Sang-Jin;Kang, In-Mo;Kim, Myung-Seong
    • 한국전산유체공학회:학술대회논문집
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    • 2006.10a
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    • pp.136-141
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    • 2006
  • A prediction of store separation trajectory using grid survey method has been conducted. For the grid survey method, store's aerodynamic flowfield data such as freestream and grid data is needed to solve 6 degree of freedom(6-DOF) equations of motion. In the presented study, aerodynamic flowfield data was generated by Euler solver instead of CTS wind tunnel test. The predicted trajectories shows good agreement with CTS test results.

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NUMERICAL STUDY ON THE COMPRESSION WAVE GENERATED BY THE TRAIN ENTERING A TUNNEL (열차가 터널에 진입할 때 발생하는 압축파에 대한 수치해석 - 열차의 출발방법 및 터널과의 거리에 대한 영향)

  • Kim, S.R.
    • 한국전산유체공학회:학술대회논문집
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    • 2006.10a
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    • pp.189-192
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    • 2006
  • The numerical simulations on the train entrering a tunnel were performed by solving unsteady axi-symmetric problems. To reduce the effects of the pressure wave generated by the train starting abruptly, several starting method of the train were also examined. The pressure rise by the train entering a tunnel was compared with other results, and similar value was obtained compared with those of previous studies.

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CURRENT STATUS OF SUPERCOMPUTING TRENDS (국내외 슈퍼컴퓨팅 동향)

  • Cho, K.W.
    • 한국전산유체공학회:학술대회논문집
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    • 2006.10a
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    • pp.210-210
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    • 2006
  • IT technologies(Chips, Grid and e-Science) are rapidly changed from 1965. In 1965, Intel co-founder Gordon Mooresaq the future. His prediction popularly known as Moore's law, state that the computer chips double in power every 18 months Grid computing offers a model for solving massive computational problems by making use of the unused resources of large numbers of disparate, often desktop, computers treated as a virtual cluster embedded in a distributed telecommunications infrastructure. In this paper, I will discuss current status of supercomputing technology and haw we can use these on CFD. Functionally, one can classify Grids into several types:

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A STUDY OF FLOW CHARACTERISTICS AND DESIGN VARIABLES IN AN LPG INJECTOR (LPG Injector 컷솔 유동 특성 및 설계 변수 연구)

  • Lee, Joon-Sik;Lim, Seol;Kim, Sang-Dug;Song, Dong-Joo
    • 한국전산유체공학회:학술대회논문집
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    • 2008.10a
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    • pp.239-243
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    • 2008
  • Fluid flow in LPG injector is delayed momently around nozzle and leaked accidentally, then engine operation becomes unstable. When attached cutsole injector that we can prevent fuel from leaking. Attaching additional devices cause loss of power and pressure. In this study, We has analyzed the performance of the LPG injector nozzle by changing cutsole geometry numerously by using Computational Fluid Dynamics.

  • PDF

DEVELOPMENT OF THE PRE-PROCESSOR FOR CFD (CFD용 전처리장치 개발)

  • Kim, S.R.
    • Journal of computational fluids engineering
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    • v.18 no.2
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    • pp.72-77
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    • 2013
  • The Pre-processor program for CFD is being developed using wxWidgets and OpenGL libraries. This program can be run on both Windows and Linux operating systems. Undergraduate students and beginners can learn and use this very easily by menu and templates. Until now, structured mesh can be created in Cartesian or Cylindrical coordinates. This program will be used easily to make various type of meshes using templates.