DES 기법을 이용한 270°곡덕트에서 발달하는 난류 유동의 수치해석

다국어 초록 (Multilingual Abstract)

Detached Eddy Simulation (DES) is performed for developing turbulent flow of the 270° curved duct at a Reynolds number of 56,690. The curvature ratio on the basis of a centric radius Rc and a duct height H is 3.357. Turbulence models adopted are k-ω model for Reynolds Average Navier-Stokes (RANS) equation Simulation and Shear Stress Transport (SST) model for DES. DES is used as the hybrid computation technique combined with RANS-SST and Large Eddy Simulation (LES). Predicted results are compared with measured results including the distributions of Reynolds stresses and the flow characteristics on the symmetric plane of curved duct are presented. Judging from the comparison between the predicted and the measured results, the DES approach is applicable to calculate the developing turbulent flow in a 270° curved duct.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 수치해석
• 3. 결과 및 토의
• 4. 결론
• 후기
• 참고문헌

참고문헌 (Reference)

1 명현국, "원형 단면을 갖는 180° 굽은 곡관내 발달하는 난류유동에 관한 수치해석" 대한기계학회 30 (30): 966-972, 2006

2 Chang, S.M, "Turbulent Flow in a Strongly Curved U-bend and Downstream Tangent of Square Cross Sections" 4 (4): 243-269, 1983

3 Spalart, P.R, "Topics in Detached Eddy Simulation" 2004

4 Menter, F.R, "Ten Years of Industrial Experience with the SST Turbulence Model" 4 : 625-632, 2003

5 Kim, M.H, "Study on the Second Moment Turbulence Model in a Square Sectioned 180° Bend" 18 (18): 1203-1217, 1994

6 Sugiyama, H, "Numerical Analysis of Developing Turbulent Flow in a 180° Bend Tube by an Algebraic Reynolds Stress Model" 47 (47): 1431-1449, 2005

7 Cho, S.H, "Measurement of Turbulent Flows in a Square Sectioned 270° Bend" 2 (2): 467-472, 2000

8 Choi, Y.D, "Measurement of Turbulent Flows Characteristics in a Circular Duct with a 180 Degree Bend by Hot Wire Anemometer" 365-370, 1998

9 Boiron, O, "Experimental and Numerical Studies on the Starting Effect on the Secondary Flow in a Bend" 574 : 109-129, 2007

10 Squires, K.D, "Detached Eddy Simulation of the Separated Flow Around a Fore Body Cross-Section. in:Direct and Large-Eddy Simulation IV" 481-500, 2001

11 Strelets, M, "Detached Eddy Simulation of Massively Separated Flows" 2001

12 Ansys Inc, "Ansys CFX-Solver 10.0 User manual" Ansys Inc 2006

13 Seo, J.S, "A Measurement on the Turbulent Flow of Variable Cross Sectioned 180° Bend by using Laser Doppler Velocimetry" 68-73, 1999

14 Travin, A, ""Detached-Eddy Simulations Past a Circular Cylinder. Flow" 63 (63): 293-313, 2000