초음속 난류 공동 유동장의 2차원과 3차원에 관한 비교 연구
 Author(s)
 우철훈
 Issued Date
 2006
 Abstract
 The supersonic flow around tandem cavities was investigated by twodimensional and threedimensional numerical simulations using the ReynoldsAveraged NavierStokes(RANS) equation with the kw turbulence model. The flow around a cavity is characterized as unsteady flow because of the formation and dissipation of vortices due to the interaction between the freestream shear layer and cavity internal flow, the generation of shock and expansion waves, and the acoustic effect transmitted from wake flow to upstream. The 2ndorder upwind TVD scheme based on the flux vector split using Van Leer's limiter was used as the numerical method. Numerical calculations were performed by the parallel processing with time discretizations carried out by the 4thorder RungeKutta method. The aspect ratio of cavities are 3 for the first cavity and 1 for the second cavity. The ratio of cavity interval to depth is 1. The ratio of cavity width to depth is 1 in the case of three dimensional flow. The Mach number and the Reynolds number were 1.5 and 4.5×10^(5), respectively. The characteristics of the dominant frequency between twodimensional and threedimensional flows were compared, and the characteristics of the second cavity flow due to the first cavity flow was analyzed. Both two dimensional and three dimensional flow oscillations were in the 'shear layer mode', which is based on the feedback mechanism of Rossiter's formula. However, three dimensional flow was much less turbluent than two dimensional flow, depending on whether it could inflow and outflow laterally. The dominant frequencies of the two dimensional flow and three dimensional flows coincided with Rossiter's 2nd mode frequency. The another dominant frequency of the three dimensional flow corresponded to Rossiter's 1st mode frequency.
 Alternative Title
 Comparison research of two and threedimensional in the supersonic turbulent cavity flow
 Affiliation
 조선대학교 대학원
 Department
 일반대학원 항공우주공학과
 Awarded Date
 200602
 Table Of Contents
 목차 = i
LIST OF TABLE = iii
LIST OF FIGURE = iv
NOMENCLATURE = vii
ABSTRACT = ix
제1장 서론 = 1
제2장 Cavity 유동의 특성 = 3
제1절 Cavity 유동의 구분 = 3
제2절 Rossiter's Formula = 5
제3장 지배방정식 및 변환 = 6
제1절 지배방정식 = 6
제2절 무차원화 = 9
제3절 지배방정식의 좌표변환 = 10
제4장 수치해석기법 = 12
제1절 공간이산화 (Space Discretization) = 12
제2절 Second Order Upwind TVD Scheme = 15
1. TVD Scheme의 개요 = 15
2. Second order TVD Scheme = 16
제3절 난류 모델 = 19
제4절 시간 이산화 = 21
제5장 계산결과 및 검토 = 23
제1절 L/D=3, W/D=1인 2차원과 3차원 초음속 공동유동 = 23
1. 격자계 및 경계조건 = 23
2. 세장비(L/D)가 3인 공동의 유동해석 결과 = 26
제2절 L/D=3과 1, W/D=1인 2차원과 3차원 초음속 이중공동유동 = 41
1. 격자계 및 경계조건 = 41
2. L/D=3, Spacing=1, L/D=1인 이중공동의 유동해석 결과 = 44
제3절 L/D=5와 1, W/D=1인 2차원과 3차원 초음속 이중공동유동 = 55
1. 격자계 및 경계조건 = 55
2. L/D=5, Spacing=1, L/D=1인 이중공동의 유동해석 결과 = 59
제4절 L/D=3인 3차원 공동의 폭비(W/D)에 따른 유동특성 비교 = 69
1. 격자계 및 경계조건 = 69
2. 폭비(W/D)에 따른 유동특성 비교 결과 = 71
제6장 결론 = 75
참고문헌 = 77
 Degree
 Master
 Publisher
 조선대학교
 Citation
 우철훈. (2006). 초음속 난류 공동 유동장의 2차원과 3차원에 관한 비교 연구.
 Type
 Dissertation
 URI
 https://oak.chosun.ac.kr/handle/2020.oak/6263
http://chosun.dcollection.net/common/orgView/200000231886

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