회전 진동하는 원형실린더 주위 유동의 폐쇄효과 연구

다국어 초록 (Multilingual Abstract)

For study on the unsteady blockage effect, flows around a rotationally oscillating circular cylinder with relatively low forcing frequency in closed test-section wind tunnels have been numerically investigated by solving compressible Navier-Stokes equations. The numerical scheme is based on a node-based finite-volume method with the Roe’s flux-difference splitting and an implicit time-integration method coupled with dual time-step sub-iteration. The computed results of the oscillating cylinder in the test section showed that the fluctuations of lift and drag are augmented by the blockage effects. The drag further increases because of low base pressure. The pressure on the test section wall shows the harmonics having the oscillating and the shedding frequencies contained in the blockage effect.

참고문헌 (Reference)

1 오우섭, "비정렬격자를 이용한 피칭 날개단면 주위의 비정상 점성유동 해석" 28 (28): 17-26, 1997

2 박영민, "동적격자를 이용한 상대운동이 있는 물체 주위의 2차원 비정상 유동해석" 27 (27): 1-10, 1999

3 Ewald, B.F.R, "Wind Tunnel Wall Correction," AGARDograph 336"

4 Kong, L., "Unsteady-Flow Testing in a Low-Correction Wind Tunnel" 12 : 33-45, 1998

5 Mokry, M., "Two-Dimensional Wind Tunnel Wall Interference" 1983

6 Paisoussis, "Real-Life Experiences with Flow-Induced Vibration" 22 : 741-755, 2006

7 Lee, S.-J., "PIV Measurement of the Wake Behind a Rotationally Oscillating Circular Cylinder" 24 : 2-17, 2008

8 Matsumoto, M. et al., "Mechanism of and How to Suppress Wind-Induced Vibration of Inclined Cables of Cable-Stayed Bridges" 75-86, 2008

9 Ollivier-Gooch, C.F., "High-Order ENO Schemes for Unstructured Meshes Based on Least Square Reconstruction" 1997

10 Norberg, C., "Fluctuating Loft on a Circular Cylinder Review and new Measurements" 17 : 57-96, 2003

11 Blevins, R.D., "Flow-Induced Vibration" Krieger Publishing Company 1990

12 Haselbacher, A.C., "Finite-Volume Discretization Aspect for Viscous Flows on Mixed Unstructured Grids" 1997

13 McAlister, K.W., "Dynamic Stall Experiments on the NACA 0012 Airfoil" 1978

14 Schlichting, H., "Boundary-Layer Theory" McGraw-Hill 24-46, 1979

15 Roe, P.L., "Approximate Riemann Solvers, Parameter Vectors, and Difference Scheme" 43 : 357-372, 1997

16 McCroskey, W.J., "An Experimental Study of Dynamic Stall on Advanced Airfoil Sections Volume 1. Summary of the Experiment" 1982