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MEMS 부품을 위한 다결정 박막의 탄성 물성치 추출 시스템의 매개변수의 영향
정향남(H. N. Jung),최재환(J. H. Choi),정희택(H. T. Chung),이준기(J. K. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A numerical system to extract effective elastic properties of polycrystalline thin-films for MEMS devices is already developed. In this system, the statistical model based on lattice system is used for modeling the microstructure evolution simulation and the key kinetics parameters of given micrograph, grain distributions and deposition process can be extracted by inverse method proposed in the system. In this work, the effects of kinetics parameters on the extraction of effective elastic properties of polycrystalline thin-films are studied by using statistical method. The effects of the fraction of the potential site( P<SUB>f</SUB>) and the nucleation probability( N<SUB>p</SUB>) among the parameters for deposition process of microstructure on the extraction of effective elastic properties of polycrystalline thin-films are studied.
익렬유동의 수치해석에서의 복합 정렬-비정렬 격자계의 적용 연구
정향남(H. N. Jung),정희택(H. T. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Numerical simulation has been performed to examine the effects of the computational grids on the prediction of the flow characteristics inside the transonic turbine cascades. Three kinds of computational grids are applied to the high-turning transonic turbine rotor blades and are compared in the sense of stability and accuracy. In addition, the grid adaptation has been tried in order to improve the prediction of the blade performance.
축류터빈 내부의 3차원 압축성 점성 유동특성에 관한 수치 시물레이션
정희택(H. T. Chung),정향남(H. N. Jung) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
Numerical simulation of viscous compressible flow in turbomachinery cascade involves many problems due to the complex geometry of blade but also flow phenomena. In the present study, numerical investigations have been performed to examine the three-dimensional flow characteristics inside the transonic linear turbine cascades using a commercial code, FLUENT. Multi-block H-type grids are applied to the high-turning turbine rotor blades and comparisons with the experimental data and the numerical results have been done. In addition, the effects of turbulence models on the prediction of the endwall flows are analyzed in the sense of the flow compressibility.
정희택(H.T. Chung),정향남(H.N. Jung),서영수(Y.S. Seo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Numerical investigations have been performed to examine the effects of the computational grids on<br/> the prediction of the flow characteristics inside the turbine cascades. Three kinds of grid system based<br/> on H-type grid are applied to the high-turning transonic turbine rotor blades and comparisons with the<br/> experimental data and the numerical results of each grid structure have been done. In addition, the grid<br/> sensitivity on the estimation of the blade performances has been investigated.
정희택(H.T. Chung),정향남(H.N. Jung) 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.2
Numerical investigations have been performed to examine the effects of the computational grids on the prediction of the flow characteristics inside the turbine cascades. Three kinds of grid system based on H-type grid are applied to the high-turning transonic turbine rotor blades and comparisons with the experimental data and the numerical results of each grid structure have been done. In addition, the grid sensitivity on the estimation of the blade performances has been investigated.