• Title/Summary/Keyword: Computational fluid dynamics(CFD)

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FLUID-STRUCTURE INTERACTION ANALYSIS FOR HIGH ANGLE OF ATTACK MANEUVER MISSILE (고받음각에서 기동하는 미사일의 공력-구조 연계 해석)

  • Noh, K.H.;Park, M.Y.;Park, S.H.;Lee, J.W.;Byun, Y.H.
    • 한국전산유체공학회:학술대회논문집
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    • 2007.10a
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    • pp.111-114
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    • 2007
  • Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM) are used to perform aerodynamics analysis and structure analysis. For the fluid-structure interaction analysis, each technology should be considered as well. The process of aerodynamics-structure coupled analysis can be applied to various integrated analyses from many research fields. In this study, the aerodynamics-structure coupled analysis is performed for the missile at high angle of attack condition through the use of Computational Fluid Dynamics (CFD) and the Finite Element Method (FEM). For this purpose, the aerodynamics-structure coupled analyses procedure for the missile are established. The results of the integrated analysis are compared with rigid geometry of the missile and the effect of the deformation will be addressed.

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A high-resolution mapping of wind energy potentials for Mauritius using Computational Fluid Dynamics (CFD)

  • Dhunny, Asma Z.;Lollchund, Michel R.;Rughooputh, Soonil D.D.V.
    • Wind and Structures
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    • v.20 no.4
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    • pp.565-578
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    • 2015
  • A wind energy assessment is an integrated analysis of the potential of wind energy resources of a particular area. In this work, the wind energy potentials for Mauritius have been assessed using a Computational Fluid Dynamics (CFD) model. The approach employed in this work aims to enhance the assessment of wind energy potentials for the siting of large-scale wind farms in the island. Validation of the model is done by comparing simulated wind speed data to experimental ones measured at specific locations over the island. The local wind velocity resulting from the CFD simulations are used to compute the weighted-sum power density including annual directional inflow variations determined by wind roses. The model is used to generate contour maps of velocity and power, for Mauritius at a resolution of 500 m.

Development of Free-surface Decomposition Method and Its ApplicationDevelopment of Free-surface Decomposition Method and Its Application

  • Park, Sunho
    • Journal of Advanced Research in Ocean Engineering
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    • v.3 no.2
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    • pp.75-82
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    • 2017
  • With the development of computational fluid dynamics (CFD), studies on shipbuilding and maritime issues including free-surface wave flow have been conducted. Although the volume of fluid (VOF) and level-set methods are widely used to study the free-surface wave flow, disadvantages exist. In particular, it takes a long time to obtain solutions. In this study, a free-surface capturing code is developed for ship and offshore structures. The developed code focuses on accuracy and computation time. Open source CFD libraries, termed OpenFOAM, are used to develop the code. The results obtained using the developed code are compared with those obtained using interFoam. The results show that the developed code could be used to capture the free-surface wave flow without numerical diffusion; moreover, the accuracy of the developed code is largely the same as that of interFoam.

Numerical Simulation of Flow and Dross Particle Transfer in a 55% Al-Zn Pot

  • Kim, Hwang Suk;Kim, Jong Gi;Yoon, Seung Chae;Im, Hee Joong;Moon, Man Been
    • Corrosion Science and Technology
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    • v.11 no.3
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    • pp.71-76
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    • 2012
  • Computational fluid dynamics (CFD) is nowadays a powerful and reliable tool for simulating different flow processes and temperature. CFD is used to analyze the various pot geometries and operative variables in 55% Al-Zn pot of CGL. In this research, different strip velocities were assumed and then shown the flow pattern in the pot that was similar in the different strip velocities. Temperature distribution in the pot depended on inductors and inlet strip temperature at the steady condition. Generation of dross particles and transport models were considered to describe dross particles evolution inside the pot. In order to observe dross influence by scrap location, dross particles were generated upon the sink roll. Floating time of dross particles is different by scraper locations above the sink roll.

Efficiency Prediction of the Particle Removal Efficiency of Multi Inner Stage(MIS) Cyclone by Computational Fluid Dynamics(CFD) Analysis and Experimental Verification (CFD 해석을 이용한 Multi Inner Stage Cyclone 내부의 미세입자제거 효율 예측 및 실험적 검증)

  • Kim, Hye-Min;Kwon, Sung-An;Lee, Sang-Jun
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2012.07a
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    • pp.243-246
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    • 2012
  • A new multi inner stage(MIS) cyclone was designed to remove the acidic gas and minute particles of harmful materials produced from electronic industry. To characterize gas flow in MIS cyclone, pressure and velocity distribution were calculated by means of computational fluid dynamics(CFD) commercial program. Also, the flow locus of particles and particle removal efficiency were analyzed by Lagrangian method. When outlet pressure condition was -1,000 Pa, the efficiency was the best in this study. Based on the CFD simulation result, the pressure loss and destruction removal efficiency was measured through MIS cyclone experiment.

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A Numerical Investigation of Indoor Air Quality with CFD

  • Sin V. K;Sun H. I
    • 한국전산유체공학회:학술대회논문집
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    • 2003.10a
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    • pp.207-208
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    • 2003
  • Increasing interest in indoor air quality (IAQ) control has been found because of its serious effect on human health. To evaluate IAQ, thermal comfort in terms of temperature and velocity distributions of indoor air has to be analyzed in detail. Choice of location for installation of air-conditioner in a building will affect the performance of cooling effect and thermal comfort on the occupants, which in turn will affect the indoor air quality (IAQ) of the building. In this paper, we present a discussion on the proper location of the air-conditioner in order to obtain good thermal comfort for occupant of a typical bedroom in Macao. A set of carefully designed numerical experiments is run with the Computational Fluid Dynamics (CFD) software FLOVENT 3.2 [1]. Reynolds averaged Navier-Stokes equations are solved with finite volume technique and turbulence effects upon the mean flow characteristics is modeled with the k - & model. Assumption of steady state environment is made and only convective and conductive heat transfer from the occupant and air-conditioner are being concerned.

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ACCURACY IMPROVEMENT OF THE BLEED BOUNDARY CONDITION WITH THE EFFECTS OF POROSITY VARIATIONS AND EXPANSION WAVES (다공도 및 팽창파의 영향을 고려한 BLEED 경계조건 수치 모델링의 정확도 향상 연구)

  • Kim, G.;Choe, Y.;Kim, C.
    • Journal of computational fluids engineering
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    • v.21 no.1
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    • pp.94-102
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    • 2016
  • The present paper deals with accuracy improvement of a bleed boundary condition model used to improve the performance of supersonic inlets. In order to accurately predict the amount of bleed mass flow rates, this study performs a scaling of sonic flow coefficient data for 90-degree bleed holes in consideration of Prandtl-Meyer expansion theory. Furthermore, it is assumed that porosity varies with stream-wise location of the porous bleed plate to accurately predict downstream boundary layer profiles. The bleed boundary condition model is demonstrated through Computational Fluid Dynamics(CFD) simulations of bleed flows on a flat plate with/without an oblique shock. As a result, the bleed model shows the improved accuracy of bleed mass rates and downstream boundary layer profiles.

DEVELOPMENT OF A HYBRID CFD FRAMEDWORK FOR MULTI-PHENOMENA FLOW ANALYSIS AND DESIGN (다중현상 유동 해석 및 설계를 위한 융복합 프레임웍 개발)

  • Hur, Nahm-Keon
    • 한국전산유체공학회:학술대회논문집
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    • 2010.05a
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    • pp.517-523
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    • 2010
  • Recently, the rapid evolution of computational fluid dynamics (CFD) has enabled its key role in industries and predictive sciences. From diverse research disciplines, however, are there strong needs for integrated analytical tools for multi-phenomena beyond simple flow simulation. Based on the concurrent simulation of multi-dynamics, multi-phenomena beyond simple flow simulation. Based on the concurrent simulation of multi-dynamics, multi-physics and multi-scale phenomena, the multi-phenomena CFD technology enables us to perform the flow simulation for integrated and complex systems. From the multi-phenomena CFD analysis, the high-precision analytical and predictive capacity can enhance the fast development of industrial technologies. It is also expected to further enhance the applicability of the simulation technique to medical and bio technology, new and renewable energy, nanotechnology, and scientific computing, among others.

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AERODYNAMIC ANALYSIS AND COMPARISON OF EXPERIMENTAL DATA FOR 2-BLADED VERTICAL AXIS WIND TURBINE (2엽형 수직축 풍력발전기의 유동해석 및 실험 비교)

  • Hwang, M.H.;Kim, D.H.;Lee, J.W.;Oh, M.W.;Kim, M.H.;Ryu, G.J.
    • Journal of computational fluids engineering
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    • v.15 no.4
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    • pp.85-91
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    • 2010
  • In this study, aerodynamic analyses based on unsteady computational fluid dynamics (CFD) have been conducted for a 2-bladed vertical-axis wind turbine (VAWT) configuration. Reynolds-averaged Navier-Stokes equations with standard $k-{\varepsilon}$ and SST $k-{\varepsilon}$ turbulence models are solved for unsteady flow problems. The experiment model of 2-bladed VAWT has been designed and tested in this study. Aerodynamic experiment of the present VAWT model are effectively conducted using the vehicle mounted testing system. The comparison result between the experiment and the computational fluid dynamics (CFD) analysis are presented in order to verify the accuracy of CFD modeling with different turbulent models.