VORTEX INTERFERENCE IN THE WAKE OF TWO TANDEM CIRCULAR CYLINDERS IN A CROSS FLOW

목차

1. Introduction

2. Flow Visualization and Particle Image Velocimetry

3. Results and Discussions
1) Variation of wake patterns according to L/d
2) The PIV experiments

4. References

본문내용

The cross flow past two circular cylinders has been long studied in connection with FIV
(flow induced vibration) problems in a tube array or tube bundle. Of special interest is the variation of the mode of vortex generation according to the spacing of two cylinders. As far as two circular cylinders in tandem arrangement are concerned, Thomas & Kraus1 reported already in 1964 that there is a drastic change in vortex mode at a critical spacing of about L/d = 3.5 to 3.9. This was first recognized as a jump of drag and wake frequency curves and then confirmed by some flow visualization experiments,

참고 자료

D.G. Thomas and K.A. Kraus, “Interaction of Vortex Streets”, J. Applied Physics, Vol.35 (1964), pp.3458-3459.
M.M. Zdravkovich, “Review of Flow Interference between Two Circular Cylinders in Various Arrangements”, Trans. ASME - J. Fluids Engineering, Vol.99 (1977), pp.618-633.
R. Kwong, K. Lam and R.M.C. So, “Investigation of In-line Circular Cylinders in a Cross Flow Using Particle Image Velocimetry and Laser Induced Fluorescence”, Proc. 9th International Symposium on Flow Visualization (2000), Paper number 181.
J.R. Meneghini, F. Saltara, C.L.R. Siqueira and J.A. Ferrari-Jr, “Numerical Simulation of Flow Interference between Two Circular Cylinders in Tandem and Side-by-side Arrangements”, J. Fluids and Structures, Vol.15 (2001), pp.327-350.
B. Sharman, F.S. Lien, L. Davidson and C. Norberg, “Numerical Predictions of Low Reynolds Number Flows over Two Tandem Circular Cylinders”, International Journal for Numerical Methods in Fluids, Vol.47 (2005), pp.423-447.
Y. Ohya, A. Okajima. and M. Hayashi., “Wake Interference and Vortex Shedding”, Encyclopedia Fluid Mechanics, Vol.8 (1989), pp.323-389.