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공기부상 전동 운행체의 지면효과를 받는 3차원 날개에 대한 공력해석 연구
오현준(H. J. Oh),서정희(J. H. Seo),문영준(Y. J. Moon),조진수(J. S. Cho),윤용현(Y. H. Yoon) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Aerodynamic characteristics of three-dimensional wings in ground effect for Aero-levitation Electric Vehicle(AEV) are numerically investigated for various ground clearances and wing spans at the Reynolds number of 2×10^6 Numerical results show that a sizeable three-dimensional flow separation occurs with formation of an arch vortex at the junction of main and vertical wings, and that this is conjectured a primary cause for the high lift-to-drag(L/D) reduction rate of the main wing, when the wing span is decreased. Improvements on L/D ratios of the wings with small spans are pursued by breaking the coherence of superimposed adverse pressure gradients at the wing junction.
수치해석에 의한 횡류홴의 성능/소음 특성분석 및 최적화
조석규(S.K. Cho),조용(Y. Cho),문영준(Y.J. Moon),곽지호(J.H. Kwak),라종래(J.R. Ra),김재원(J.W. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The performance and noise characteristics of cross flow fans are investigated by computational methods. The 2-D incompressible Navier-Stokes equations in moving coordinates are solved for obtaining the pressure fluctuations at the impeller blades and the stabilizer. The acoustic pressures arc then computed by the Ffowcs Williams-Hawkings equation. The performance and noise characteristics of the cross flow fan are investigated about the blade setting angle(α). the diffusing angle(β) and the stabilizer installation angle(??) and an optimized model is searched by using the Taguchi method. From the comparison. it is found that the flow energy biased to the stabilizer is evenly redistributed and the fan performance and noise characteristics are improved by the optimized model.
수처리 교반기용 프로펠러의 차원 유동 전산 해석 및 성능 특성 분석
배용균(Y.G. Bae),김대한(D.H. Kim),황승태(S.T. Hwang),문영준(Y.J. Moon) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.1
In this study, the characteristics of water treatment mixer with various propeller profiles are numerically invesitgated. The computation was conducted by solving the incompressible Navier-Stokes equations on unstructured tetrahedral elements with k-ε turbulence model. It was found that the spreading angle and swirl magnitude of the jet are important factors for the mixer efficiency, since they clearly characterize the propeller and the frontal surface area of the propeller but not so much affected by the skew angle if it exceeds 30 degrees. The case1 and case2 models are found to show the best propeller efficiency. The case2 with low blade angle, however, requires the lowest power input for the same discharge capacity as the case1.
Brinkman Penalization 기법을 이용한 삼차원 공력소음 해석
조용우(Y.W. Jo),김호연(H.Y. Kim),배익현(I.H. Bai),문영준(Y.J. Moon) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.11
To resolve aerodynamic noise problem with complex three-dimensional geometry, measures must be taken to ease the complexity involved in numerical analysis. The flow field using moving-unstructured grid was interfaced to structured acoustic grid. To represent moving solid body, Brinkman coefficient is used to map solid into acoustic domain. Different values for permeability are used respectively to distinguish the solid and flow region. calculated simultaneously. The acoustic field is computed using the linearized compressible perturbed equations (LPCE) based on variable decompositions into incompressible and perturbed compressible component. The method used in this study can be applied to problems such as axial-flow fan noise and Blue-ray laser disc noise.
신준식(J.S. Shin),문영준(Y.J. Moon) 한국전산유체공학회 1996 한국전산유체공학회 학술대회논문집 Vol.1996 No.-
A multigrid algorithm is applied to the compressible and incompressible, Euler and Navier-Stokes equations to accelerate the convergence of the 4-stage Runge-Kutta time integration method. Effectiveness of the multigrid algorithm is demonstrated for various applications of the flow: a transonic flow over a 10% bump (M_∞=0.675), a subsonic separated flow over a 5% bump (Re=8000, M_∞ =0.5), and incompressible lid-driven cavity flows (Re=400, 1000 and 5000). Present results show that computational time is considerably reduced by using the multigrid method.
장인영(I.Y. Jang),한창균(C.K. Han),문영준(Y.J. Moon) 한국전산유체공학회 2017 한국전산유체공학회지 Vol.22 No.2
In this research, tonal noise characteristics of the ducted axial fan is investigated by a CFD/CAA hybrid method. A three-dimensional unsteady flow field is first calculated by the unsteady Reynolds-averaged Navier-Stokes equations. The noise sources obtained by uRANS CFD are decomposed into tonal frequencies and the corresponding acoustic fields are computed by solving the compressible Navier-Stokes equations with the six-order compact scheme and the four-stage Runge-Kutta method. With decomposed CAA solution, acoustic characteristics analysis of the ducted axial fan are conducted by identifying the spatial distribution of the noise sources at tonal frequencies.