caa a22 4500 445812494 CHVBK 20180317145216.0 cr unu---uuuuu 170323e20111101xx s 000 0 eng 10.1007/s00419-011-0514-3 doi (NATIONALLICENCE)springer-10.1007/s00419-011-0514-3 Force coefficients and Strouhal numbers of three circular cylinders subjected to a cross-flow [Elektronische Daten] [Sohrab Pouryoussefi, Masoud Mirzaei, Sam Pouryoussefi] In this paper, wind tunnel experiments were conducted to measure the mean force coefficients and Strouhal numbers for three circular cylinders of equal diameters in an equilateral-triangular arrangement when subjected to a cross-flow. These experiments were carried out at five subcritical Reynolds numbers ranging from 1.26× 104 to 6.08× 104. The pressure distributions on the surface of the cylinders were measured using pressure transducers. Furthermore, the hot-wire anemometer was employed to measure the vortex shedding frequencies behind each cylinder. Six spacing ratios (l/d) varying from 1.5 to 4 were investigated. It is observed that for l/d>2, the upstream cylinder experiences a lower mean drag coefficient compared with the downstream cylinders. The minimum values of the drag coefficient for the downstream cylinders occur at l/d=1.5 and l/d=2, because there is no vortex shedding from the foregoing cylinders. Also, the value of the pressure coefficient behind the upstream cylinder reduces by increasing l/d. Moreover, by decreasing the value of l/d, the Strouhal number for the upstream cylinder increases. It can be concluded that the flow pattern and aerodynamic coefficients are basically dependent on l/d; in other words, decreasing l/d results in an increase in the effects of the flow interference between the cylinders. Springer-Verlag, 2011 Circular cylinders nationallicence Pressure distribution nationallicence Force coefficients nationallicence Spectral analysis nationallicence Vortex shedding frequency nationallicence Pouryoussefi Sohrab Department of Aerospace Engineering, K.N. Toosi University of Technology, P.O. Box 16765-3381, Tehran, Iran aut Mirzaei Masoud Department of Aerospace Engineering, K.N. Toosi University of Technology, P.O. Box 16765-3381, Tehran, Iran aut Pouryoussefi Sam Air University of Shahid Sattari, P.O. Box 1384663113, Tehran, Iran aut Archive of Applied Mechanics Springer-Verlag 81/11(2011-11-01), 1725-1741 0939-1533 81:11<1725 2011 81 419 https://doi.org/10.1007/s00419-011-0514-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00419-011-0514-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pouryoussefi Sohrab Department of Aerospace Engineering, K.N. Toosi University of Technology, P.O. Box 16765-3381, Tehran, Iran aut NATIONALLICENCE 700 1- Mirzaei Masoud Department of Aerospace Engineering, K.N. Toosi University of Technology, P.O. Box 16765-3381, Tehran, Iran aut NATIONALLICENCE 700 1- Pouryoussefi Sam Air University of Shahid Sattari, P.O. Box 1384663113, Tehran, Iran aut NATIONALLICENCE 773 0- Archive of Applied Mechanics Springer-Verlag 81/11(2011-11-01), 1725-1741 0939-1533 81:11<1725 2011 81 419 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer