• 제목/요약/키워드: Three-dimensional numerical analysis

검색결과 1,782건 처리시간 0.032초

병렬계산에 의한 비축대칭 3차원 스핀업 유동해석 (Analysis of Three-dimensional Nonaxisymmetric Spin-up by Using Parallel Computation)

  • 박재현;최윤환;서용권
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2001년도 춘계학술대회논문집E
    • /
    • pp.512-517
    • /
    • 2001
  • In this study, spin-up flows in a rectangular container are analysed by using three-dimensional computation. In the numerical computation, we use the parallel computer system of PC-cluster type. We compared our results with those obtained by two-dimensional computation. Effect of velocity and vorticity on the flow is studied. The result shows that two-dimensional solution is in good agreement with the 3-D result. Attention is given to the region where the 3-D flow is significant.

  • PDF

3-D EMCN법을 이용한 광 픽업 액츄에이터의 해석 (Analysis of Optical Pickup Actuator by 3-D EMCN method)

  • 김진아;정태경;최인호;흥삼열
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2001년도 하계학술대회 논문집 B
    • /
    • pp.771-773
    • /
    • 2001
  • In this paper, three dimensional Equivalent Magnetic Circuit Method(3-D EMCN method) a numerical analysis method which supplements to magnetic equivalent circuit adding numerical technique, is proposed for analysis Optical Pickup Actuator. (3) This method provides better characteristics both in precision of the analysis and in computation time than other analysis method such as three-dimensional Finite Element Method. We choose the simple 2-magnet moving coil type pickup actuator model and verify upper yoke effect using this method.

  • PDF

3D-EMCN범을 이용한 광 픽업 엑츄에이터의 해석 및 최적설계 (Analysis and Optimal Design of Optical Pickup Actuator by 3-D EMCN method)

  • 김진아;정태경;최인호;홍삼열
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
    • /
    • pp.12-14
    • /
    • 2001
  • In this paper, three dimensional Equivalent Magnetic Circuit Method(3-D EMCN method), a numerical analysis method which supplements to magnetic equivalent circuit adding numerical technique, is proposed for analysis Optical Pickup Actuator. [3] This method provides better characteristics both in precision of the analysis and in computation time than other analysis method such as three-dimensional Finite Element Method. RCS Niching Genetic Algorithm are used for optimal design.

  • PDF

3차원 구조물의 동적응답 해석알고리즘에 관한 연구 (A Study on Dynamic Response Analysis Algorithm for Three Dimensional Structure)

  • 문덕홍;강현석;최명수
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2000년도 춘계학술대회논문집A
    • /
    • pp.637-642
    • /
    • 2000
  • This paper suggests new analysis algorithm for tile dynamic response of three dimensional structure which is frequently found in pipe line system of plant by the combination of the transfer stiffness coefficient method(TSCM) and Newmark method. Presented analysis algorithm for dynamic response can improve the computational accuracy remarkably owing to advantages of tile TSCM in comparison of transfer matrix method(TMM). Analysis system was modeled as a lumped mass system in this mettled. The analysis algorithm for dynamic response was formulated for the three dimensional structure. The validity of the this method is demonstrated through the results of numerical experiment for simple computational model by the TSCM and TMM.

  • PDF

엇갈리게 기울어진 충돌제트들에 의한 오목면 상의 열전달 성능해석 (ANALYSIS OF HEAT TRANSFER OF INCLINED IMPINGING JETS ON A CONCAVE SURFACE)

  • 허만웅;이기돈;김광용
    • 한국전산유체공학회지
    • /
    • 제16권2호
    • /
    • pp.11-16
    • /
    • 2011
  • Numerical analyses have been carried out to analyze the three-dimensional turbulent heat transfer by impingement jet on a concave surface with variation of geometric configurations. Three-dimensional Reynolds averaged Navier-stokes equations have been calculated using the shear stress transport turbulent model. The numerical results for heat transfer rate were validated in comparison with the experimental data. The distance between jet nozzles and angle of inclined jet nozzle were selected as the geometric variables. Area-averaged Nusselt numbers on concave surface are evaluated to find the characteristics of heat transfer with the two geometric variables. The heat transfer increases as the distance between jet nozzles increases, and the inclined impinging jets show much better heat transfer performance than the vertical impinging jet.

LNG 연료를 이용한 가스 터빈 연소기의 연소유동 해석 (Analysis of Combustion Flow of LNG-Fueled Gas Turbine Swirl Burner)

  • 김태호;강기하;최정열;김성철
    • 한국연소학회지
    • /
    • 제13권3호
    • /
    • pp.33-40
    • /
    • 2008
  • Two- and Three- dimensional numerical simulations are carried out to understand the combustion characteristics of LNG-fueled gas turbine combustor for power generation using imported and domestic natural gases. Reacting flow characteristics of the swirl stabilized natural gas combustor were understood from the numerical results with the flow conditions selected from the gas turbine operation data. The thermal influences of different natural gases were very small and the fuel composition and flow rate were considered to be tuned well. The flow structures of the recirculation and combustion region was understood from the comparison of the two- and three-dimensional results. The complexity of the three-dimensional swirl flows inside the gas turbine combustor with multiple swirlers was understood those resulting from the interactions of the stage and pilot burners.

  • PDF

정지비행하는 작은 벌의 3차원 공력특성 (Three Dimensional Aerodynamic Characteristics of a Small Bee in Hovering Flight)

  • 노기덕
    • 한국가시화정보학회:학술대회논문집
    • /
    • 한국가시화정보학회 2006년도 추계학술대회 논문집
    • /
    • pp.102-108
    • /
    • 2006
  • The three-dimensional flows in the Weis-Fogh mechanism are studied by flow visualization and numerical simulation by the discrete vortex method. In this mechanism, two wings open, touching their trailing edges (fling), and rotate in opposite directions in the horizontal plane. The structure of the vortex systems shed from the wings is very complicated and their effects on the forces on the wings have not yet been clarified. The discrete vortex method, especially the vortex stick method, is employed to investigate the vortex structure in the wake of the two wings. The wings are represented by lattice vortices, and the shed vortices are expressed by discrete three-dimensional vortex sticks. The vortex distributions and the velocity field are calculated. The pressure is estimated by the Bernoulli equation, and the lift on the wing are also obtained.

  • PDF

1 Giga급 집적회로 구현을 위한 3차원 산화 공정 시뮬레이터 개발 및 산화층 성장 특성 분석에 관한 연구 (Development of three-dimensional thermal oxidation process simulator and analysis the characteristics of multi-dimensional oxide growth)

  • 이준하;황호정
    • 전자공학회논문지A
    • /
    • 제32A권8호
    • /
    • pp.107-118
    • /
    • 1995
  • Three-dimensional simulator for thermal oxidation process is developed. The simulator is consisted by two individual module, one is analytic-model module and the other is numerical-model module. The analytic-model which uses simple complementary-error function guarantees fast calculation in prediction of multi-dimensional oxidation process. The numerical-model which is based on boundary element method (BEM), has a good accuracy and suitable for various process conditions. The results of this study show that oxide growth is retarded at the corner of hole structure and enhanced at the corner of island structure. These effects are reson of different distribution of oxidant diffusion and mask stress. The utility of models and simulator developed in this study is demonstrated by using it to predict not only traditional shape of LOCOS but also process effects in small geometry.

  • PDF

수평 사각채널 내 저 레놀즈수 혼합대류 유동의 3차원 수치해석 (3-D Numerical Analysis on a low Reynolds Number Mixed Convection in a Horizontal Rectangular Channel)

  • 박일용;배대석
    • 한국마린엔지니어링학회:학술대회논문집
    • /
    • 한국마린엔지니어링학회 2005년도 전기학술대회논문집
    • /
    • pp.210-215
    • /
    • 2005
  • A three-dimensional numerical simulation is performed to investigate on a low Reynolds number mixed convection in a horizontal rectangular channel with the upper part cooled and the lower part heated uniformly. The three-dimensional governing equations are solved using a finite volume method. For convective term, the central differencing scheme is used and for the pressure correction, the PISO algorithm is used. Solutions are obtained for A=4, Pr=0.72, 10, 909, the Reynolds number ranging from $2.1{\times}10^{-2}$ to $1.2{\times}10^{-1}$, the Rayleigh number is $3.5{\times}10^4$. It is found that vortex roll structures of mixed convection in horizontal rectangular channel can be classified into three roll structures which affected by Prandtl number and Reynolds number.

  • PDF

Inversion of Material Coefficients for Numerical Analysis of Piezoelectric Actuators Using a Three-Dimensional Finite Element Method

  • Joo, Hyun-Woo;Lee, Chang-Hwan;Park, Jong-Seok;Jung, Hyun-Kyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • 제3B권2호
    • /
    • pp.67-73
    • /
    • 2003
  • In this paper, the impedance of a piezoelectric transducer is calculated using the three-dimensional finite element method. The validity of numerical routine is confirmed experimentally. Using this numerical routine, the effects of material coefficients on piezoelectric actuators characteristics are analyzed. The material constants, which make significant effects, are selected and the relations between material constants are studied. Using these processes, three variables of material constants for a piezoelectric transducer are selected and the design sensitivity method is adopted as an inversion scheme. The validity of the inversion scheme for a piezoelectric transducer is confirmed by applying the proposed method to the sample piezoelectric transducer.