• 제목/요약/키워드: CFD

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MSAP을 이용한 F/A-18C로 부터 JDAM 분리 해석 (Application of MSAP to JDAM Separation from an F/A-18C Aircraft)

  • 이승수
    • 한국전산유체공학회지
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    • 제9권1호
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    • pp.41-47
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    • 2004
  • A successful store separation analysis tool, MSAP(Multi-body Separation Analysis Program) has been applied to F/A-18C/JDAM CFD Challenge Ⅱ. The challenge was devised to challenge CFD community to use CFD methodologies to predict and match the trajectory of a JDAM MK-84 separating from F/A-l8C. Trajectory simulations for two flight conditions were performed. Comparison between computed and measured flight trajectories for both conditions shows a good agreement.

온실 포그냉방시스템의 냉방효과 예측을 위한 CFD 모델의 개발 (Development of CFD Model for Estimation of Cooling Effects of Fog Cooling System in Greenhouse)

  • 유인호;김문기;권혁진
    • 한국생물환경조절학회:학술대회논문집
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    • 한국생물환경조절학회 2001년도 가을 학술발표논문집
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    • pp.78-81
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    • 2001
  • 포그냉방시스템에 관한 연구는 대부분 VETH선도 등을 이용하여 온실 환경이 전체적으로 동질이라는 가정하에서 환기량 및 전체 분무수량 등을 계산하는 정도였으나, 1990년대 중반에 들어서면서 CFD 기법을 이용하여 온실 환경을 보다 정확하게 해석할 목적으로 CFD 기법을 이용하는 연구가 활발하게 이루어지고 있다. (중략)

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지상 경계층 풍동 설계를 위한 CFD의 적용 (Application of CFD to Design Atmospheric Boundary Layer Wind Tunnel)

  • 장병희
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2001년도 추계 학술대회논문집
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    • pp.37-43
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    • 2001
  • The methods of atmospheric boundary layer generation in test section were reviewed. To utilize conventional aerodynamic wind tunnels as atmospheric wind tunnels, boundary layer growth should be accelerated. To achieve this, improvement of boundary layer generation devices is required and it might be done by CFD. In this respect, CFD application cases in boundary generation devices were reviewed and potential areas were considered. Some cases are tried by Fluent 5 code.

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CFD 시뮬레이션에 의한 온실의 열환경 분석 (Analysis for thermal environment in Greenhouse by CFD simulation)

  • 김현수;김문기;김기성
    • 한국생물환경조절학회:학술대회논문집
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    • 한국생물환경조절학회 2000년도 학술발표논문집
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    • pp.80-83
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    • 2000
  • 최근에 CFD 시뮬레이션을 이용한 온실의 공기유동을 해석하려는 시도들이 많이 이루어지고 있다. 그러나 아직 열환경까지를 해석하려는 경우는 드물다. 그러나 여름철의 고온극복을 위해 많은 냉방시스템이 연구되고 있는데 이러한 것들의 이용에 있어서 CFD 시뮬레이션을 이용한 열환경 해석은 중요한 의미를 가질 것이다. 그리고 여러 가지 냉방시스템들 중에서 포그시스템이 효율, 경제적 측면에서 유리하다고 알려져 있다. (중략)

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

  • 김철완;정진덕;이장연
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2004년도 추계 학술대회논문집
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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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CFD 데이터를 이용한 난류구조의 가시화 (On the Visualization of Turbulent Structures Using CFD Technique)

  • 나양
    • 한국가시화정보학회지
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    • 제2권2호
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    • pp.20-24
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    • 2004
  • Recent advances in CFD technique along with a rapid growth of computer resources provide valuable opportunities for developing an accurate way of visualizing turbulent structures. Not only this visualization technique made it possible to check the validity of many of theoretical achievements of the past but also it pushes the current turbulence research to a new paradigm. A brief history of visualization study will be summarized and discussed.

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CFD를 이용한 Frisbee의 공력 특성에 대한 고찰(II) (CFD Study on Aerodynamic Characteristics of Frisbee (II))

  • 김철완;장병희;이장연
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2005년도 춘계 학술대회논문집
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    • pp.114-118
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    • 2005
  • CFD simulation was peformed for 2D and 3D flying and rotating frisbees. Multiple reference method(MRF) was utilized to consider the rotation of 3D model. Geometry change of 2D model shows dramatic increase of lift, but 3D simulation results for geometry change show decrease of lift and drag. Ground effect increases the lift of the frisbee being close to ground.

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CFD를 이용한 헬리콥터의 배기재순환 예측 (Prediction of Hot Gas Re-Ingestion of Helicopter by Numerical Method)

  • 신훈범;유진복
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2011년 춘계학술대회논문집
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    • pp.350-355
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    • 2011
  • The hot gas reingestion phenomenon of helicopter brings about the reduction of engine power available around in-ground. The phenomenon will vary for the conditions of ambient conditions and engine exhaust gas, the flow field associated with the downwash effect of main rotor. To verify the amount of hot gas reingestion to intake, Tests(Wind tunnel test, Flight test) or CFD could be available. At this study, the reingestion around in-ground would be predicted by numerical analysis(CFD).

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Analysis of conventional drag and lift models for multiphase CFD modeling of blood flow

  • Yilmaz, Fuat;Gundogdu, Mehmet Yasar
    • Korea-Australia Rheology Journal
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    • 제21권3호
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    • pp.161-173
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    • 2009
  • This study analyzes especially drag and lift models recently developed for fluid-solid, fluid-fluid or liquid-liquid two-phase flows to understand their applicability on the computational fluid dynamics, CFD modeling of pulsatile blood flow. Virtual mass effect and the effect of red blood cells, RBCs aggregation on CFD modeling of blood flow are also shortly reviewed to recognize future tendencies in this field. Recent studies on two-phase flows are found as very useful to develop more powerful drag-lift models that reflect the effects of blood cell's shape, deformation, concentration, and aggregation.

EDISON_CFD를 활용한 Clark-Y 에어포일의 공력 특성 연구 (A study on Aerodynamic Characteristics of Clark-Y Airfoil using EDISON_CFD)

  • 김호현;조하나;유기완
    • EDISON SW 활용 경진대회 논문집
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    • 제3회(2014년)
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    • pp.659-662
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    • 2014
  • 본 연구에서는 전산유체 해석프로그램인 EDISON_CFD를 이용하여 Clark-Y 에어포일의 공력특성 변화를 수치해석하고, 여러 가지 받음각의 변화를 통해 양력계수, 항력계수, 양항비 등을 도출하였다. 공력해석을 위한 조건으로 압축성 Navier-Stokes 방정식에 난류 유동조건을 적용하였다. 해석 결과는 에어포일 공력해석 툴로 널리 알려져 있는 XFOIL을 이용하여 비교 검토하였다.

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