• 제목, 요약, 키워드: RANS equation

검색결과 116건 처리시간 0.052초

공탄성 변형효과를 고려한 10MW급 풍력발전기 블레이드의 성능해석 (Performance Prediction a 10MW-Class Wind Turbine Blade Considering Aeroelastic Deformation Effect)

  • 김동현;김요한;류경중;김동환;김수현
    • 한국소음진동공학회:학술대회논문집
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    • pp.657-662
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    • 2011
  • In this study, aeroelastic performance analyses have been conducted for a 10MW class wind turbine blade model Advanced computational analysis system based on computational fluid dynamics (CFD) and computational structural dynamics (CSD) has been developed in order to investigate detailed dynamic responsed of wind turbine blade Reynolds-averaged Navier-Stokes (RANS) equations with k-${\omega}$ SST turbulence model are solved for unsteady flow problems of the rotating turbine blade model. A fully implicit time marching scheme based on the Newmark direct integration method is used for computing the coupled aeroelastic governing equations of the 3D turbine blade for fluid-structure interaction (FSI) problems.

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램제트 초음속 흡입구 내부 유동 특성 (Internal Flow characteristics of Ramjet Supersonic Intake)

  • 이형진;김세환;정인석
    • 한국추진공학회:학술대회논문집
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    • pp.331-334
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    • 2011
  • 램제트 엔진의 성능은 초음속 흡입구의 성능과 밀접한 연관이 있다. 초음속 흡입구 내부 유동 특성을 관찰하기 위해 실험적/전산해석적 연구를 수행하였다. 자발 시동이 가능한 2차원 실험 모델을 설계 제작하고 마하 2.5 초음속 풍동을 이용한 실험적 연구와 Menter's SST 난류 모델과 RANS 방정식에 기본한 전산해석 결과로부터 내부 유동 특성을 정리하였다. 흡입구의 안정 작동 조건에서의 의사충격파(Pseudo-shock wave)와 불안정 작동 조건의 버즈 현상에 대해 자세한 가시화 결과를 제시하였다.

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초음속 노즐 유동의 최적해석을 위한 난류모델의 평가와 선정 (Assessment and Validation of Turbulence Models for the Optimal Computation of Supersonic Nozzle Flow)

  • 감호동;김정수
    • 한국추진공학회지
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    • v.17 no.1
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    • pp.18-25
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    • 2013
  • 초음속 축소-확대 노즐 유동을 정확하게 해석하기 위하여, 실험치와 해석값 사이의 비교를 통해 난류모델 성능평가를 수행한다. Boussinesq 가정을 적용한 RANS 방정식으로 2차원 노즐 유동을 해석하되, Spalart-Allmaras, RNG k-${\varepsilon}$, 그리고 k-${\omega}$ SST 난류모델을 평가에 사용한다. 각 모델들로 계산된 노즐 벽면의 압력구배 및 충격파 구조는 실험 데이터와 유사한 결과를 보였는데, 그 중에서도 SST 난류모델이 실험값에 가장 근접한 해석결과를 나타내었다.

미끄럼 격자를 이용한 HAWT 시스템 주위의 비정상 유동장 해석 (Unsteady Flow Analysis Around a HAWT System Using Sliding Mesh Technique)

  • 이치훈;김상곤;조창열
    • 한국항공우주학회지
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    • v.39 no.3
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    • pp.201-209
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    • 2011
  • NREL Phase VI 수평축 풍력터빈 주위의 3차원 유동에 대하여 미끄럼 격자 기법을 사용한 비정상 RANS 해석을 수행하였다. 블레이드/타워의 간섭영향을 해석하기 위하여 로터단일과 로터/타워/나셀의 2가지 해석 모델을 구축하였다. 로터/타워/나셀의 해석 결과를 NREL의 실험데이터와 비교하여 CFD 해석모델의 유용성을 확인하였다. 두 모델에 의한 해석 결과의 비교를 통하여 비록 상풍형 풍력터빈으로서 작기는 하지만 타워/나셀의 영향이 확실히 나타나는 것을 확인하였다. 다른 가시화 결과와 토크를 포함한 적분 공력하중 등도 구축한 CFD 모델의 비정상 유동해석 능력이 효과적임을 보여주고 있다.

Robustness Improvement and Assessment of EARSM k-ω Model for Complex Turbulent Flows

  • Zhang, Qiang;Li, Dian;Xia, ZhenFeng;Yang, Yong
    • International Journal of Aerospace System Engineering
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    • v.2 no.2
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    • pp.67-72
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    • 2015
  • The main concern of this study is to integrate the EARSM into an industrial RANS solver in conjunction with the $k-{\omega}$ model, as proposed by Hellsten (EARSMKO2005). In order to improve the robustness, particular limiters are introduced to turbulent conservative variables, and a suitable full-approximation storage (FAS) multi-grid (MG) strategy is designed to incorporate turbulence model equations. The present limiters and MG strategy improve both robustness and efficiency significantly but without degenerating accuracy. Two discretization approachs for velocity gradient on cell interfaces are implemented and compared with each other. Numerical results of a three-dimensional supersonic square duct flow show that the proper discretization of velocity gradient improves the accuracy essentially. To assess the capability of the resulting EARSM $k-{\omega}$ model to predict complex engineering flow, the case of Common Research Model (CRM, Wing-Body) is performed. All the numerical results demonstrate that the resulting model performs well and is comparable to the standard two-equation models such as SST $k-{\omega}$ model in terms of computational effort, thus it is suitable for industrial applications.

실용 연소장 해석을 위한 대 와동 모사 (Large Eddy Simulation for the Analysis of Practical Combustion Field)

  • 황철홍;이창언
    • 한국연소학회:학술대회논문집
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    • pp.181-188
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    • 2005
  • Large eddy simulation(LES) methodology used to model the isothermal swirling flows in a dump combustor and the turbulent premixed flame in a model gas turbine combustor. The LES solver was implemented on parallel computer consisting 16 processors. In isothermal flow simulation, the results was compared with that of ${\kappa}-{\varepsilon}$ model as well as experimental data, in order to verify the capability of LES code. To model the turbulent premixed flame in a gas turbine, the G-equation flamelet model was used. The results showd that LES and RANS well predicted the mean velocity field of a non-swirling flow. However, in swirling flow, LES showed a better performance in predicting the mean axial and azimuthal velocities, and the central recirculation zone than those of RANS. In a model gas turbine combustor, the operation condition of high pressure and temperature induced the different phenomena, such as flame length and flow-field information, comparing with the condition of ambient pressure and temperature. Finally, it was identified that the flame and heat release oscillations are related to the vortex shedding generated by swirl flow and pressure wave propagation.

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2차원 날개단면의 앞날 형상 변화에 따른 캐비테이션 특성 연구 (Influence of the Leading Edge Shape of a 2-Dimensional hydrofoil on Cavitation Characteristics)

  • 송인행;안종우;문일성;김기섭
    • 대한조선학회논문집
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    • v.37 no.1
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    • pp.60-66
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    • 2000
  • 고속 프로펠러를 대상으로 캐비테이션 발생 특성에 가장 큰 영향을 미치는 2차원 날개단면의 앞날 형상에 관한 연구를 수행하였다. 앞날 주위의 유동장을 해석하기 위하여 비압축성 RANS(Reynolds Averaged Navier-Stokes)방정식을 유한체적법(FVM)으로 차분하는 수치해석기법을 사용하였다. 또한 패널법을 이용하여 캐비테이션 발생두께를 예측하였다. 예측된 결과들은 실험결과와 비교해서 타당함을 알 수 있었으며, 이 결과를 이용하여 새로운 단면을 설계하였다.

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비정렬 격자계에서 균질혼합 모델을 이용한 2차원 수중익형 주위의 캐비테이션 유동 해석 (CAVITATION FLOW ANALYSIS OF 2-D HYDROFOIL USING A HOMOGENEOUS MIXTURE MODEL ON UNSTRUCTURED MESHES)

  • 안상준;권오준
    • 한국전산유체공학회:학술대회논문집
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    • pp.20-24
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    • 2011
  • In this paper, numerical simulation of cavitation flow for modified NACA66 hydrofoil was made by using the multi-phase RANS equation based on pseudo-compressibility. The Homogeneous mixture model comprised of the mixture continuity, mixture momentum and liquid volume fraction equations was utilized. A vertex-centered finite-volume method was used in conjunction 2nd-order Roe's FDS to discretize the inviscid fluxes. The viscous fluxes were computed based on central differencing The Spalart-Allmaras one equation model was employed for the closure of turbulence. Reasonable agreements were obtained between the calculation results and the experiment for pressure coefficients on the hydrofoil surface.

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Numerical Design and Performance Prediction of Low Specific Speed Centrifugal Pump Impeller

  • Yongxue, Zhang;Xin, Zhou;Zhongli, Ji;Cuiwei, Jiang
    • International Journal of Fluid Machinery and Systems
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    • v.4 no.1
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    • pp.133-139
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    • 2011
  • In this paper, Based on Two-dimensional Flow Theory, adopting quasi-orthogonal method and point-by-point integration method to design the impeller of the low specific speed centrifugal pump by code, and using RANS (Reynolds Averaged N-S) Equation with a standard k-${\varepsilon}$ two-equation turbulence model and log-law wall function to solve 3D turbulent flow field in the impeller of the low specific speed pump. An analysis of the influences of the blade profile on velocity distributions, pressure distributions and pump performance and the investigation of the flow regulation pattern in the impeller of the centrifugal pump are presented. And the result shows that this method can be used as a new way in low speed centrifugal pump impeller design.

우이천 유역의 횡단 월류형 구조물 철거에 의한 수리영향 분석 (Analysis of Hydraulic effect on Removing Side Overflow Type Structures in Woo Ee Stream Basin)

  • 문영일;윤선권;전시영;김종석
    • 한국방재학회:학술대회논문집
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    • pp.687-690
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    • 2008
  • Currently, Stream flow analysis has been accomplished by one or two dimensional equations and was applied by simple momentum equations and fixed energy conservations which contain many reach uppermost limit. In this study, FLOW-3D using CFD(Computational Fluid Dynamics) was applied to stream flow analysis which can solve three dimensional RANS(Reynolds Averaged Navier-Stokes Equation) control equation to find out physical behavior and the effect of hydraulic structures. Numerical simulation accomplished those results was compared by using turbulence models such as $k-\varepsilon$, RNG(Renomalized Group Theory) $k-\varepsilon$ and LES(Large Eddy Simulation). Numerical analysis results have been illustrated by the turbulence energy effects, velocity of flow, water level pressure and eddy flows around the side overflow type structures at Jangwall bridge in urban stream.

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