Effects of Tilted Free-Stream on the Transonic Flow Past a Circular Cylinder

XU Chang-yue; SUN Zhi; WANG Cong-lei

doi:10.3879/j.issn.1000-0887.2014.10.008

Volume 35 Issue 10

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XU Chang-yue, SUN Zhi, WANG Cong-lei. Effects of Tilted Free-Stream on the Transonic Flow Past a Circular Cylinder[J]. Applied Mathematics and Mechanics, 2014, 35(10): 1135-1142. doi: 10.3879/j.issn.1000-0887.2014.10.008

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Effects of Tilted Free-Stream on the Transonic Flow Past a Circular Cylinder

doi: 10.3879/j.issn.1000-0887.2014.10.008

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics,Nanjing 210016, P.R.China

Funds: The National Natural Science Foundation of China（11202100）

Received Date: 2014-01-03
Rev Recd Date: 2014-01-21
Publish Date: 2014-10-15

Abstract

Abstract

The transonic flow past a tilted cylinder at an angle of 60°was investigated numerically with the large eddy simulation technique. Based on the previous experimental results and computational researches on transonic flow past the nontilted cylinder, the freestream Mach number was chosen as 0.75 and Reynolds number as 2×105. Compared with the transonic flow past a corresponding nontilted cylinder, effects of the tilted freestream on the force and flow characteristics of the tilted cylinder were analyzed. Because of flow control of the tilted freestream, the mean drag coefficient of the tilted cylinder is less than that of the nontilted cylinder with a drag reduction up to 45%, while less suppression of the fluctuating force is obtained. Fluid compressibility in the tilted cylinder flow is weakened due to elimination of shocks and shocklets, however, no change occurs in the whole flow modes. Owing to the tilted freestream, the shear layer shed from the tilted cylinder is more stable, which leads to a higher basepressure distribution. Two main mechanisms are associated with the more stable shear layer behind the tilted cylinder, i.e., the oblique vortexshedding mode and faster kineticenergy damping in the initial stage of shear layer developement.
- circular cylinder,
- tilted cylinder,
- compressible turbulence,
- large eddy simulation,
- flow control

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References(19)

References

[1]	Macha J M. Drag of circular cylinders a transonic Mach numbers[J].Journal of Aircraft,1977,14(6): 605-607.
[2]	Murthy V S, Rose W C. Detailed measurements on a circular cylinder in cross flow[J].AIAA Journal,1978,16(6): 549-550.
[3]	Rodriguez O. The circular cylinder in subsonic and transonic flow[J].AIAA Journal,1984,22(12): 1713-1718.
[4]	Xu C Y, Chen L W, Lu X Y. Effect of Mach number on transonic flow past a circular cylinder[J].Chinese Science Bulletin,2009,54(11): 1886-1893.
[5]	Xu C Y, Chen L W, Lu X Y. Numerical simulation of shock wave and turbulence interaction over a circular cylinder[J].Modern Physics Letters B,2009,23(3): 233-236.
[6]	许常悦, 赵立清, 王从磊, 孙建红. 趋于临界马赫数的圆柱跨声速绕流特性分析[J]. 航空学报, 2012,33(11): 1984-1992.(XU Chang-yue, ZHAO Li-qing, WANG Cong-lei, SUN Jian-hong. Characteristics analysis of the transonic flow past a circular cylinder towards the critical Mach number[J].Acta Aeronautica et Astronautica Sinica,2012,33(11): 1984-1992.(in Chinese))
[7]	许常悦, 王从磊, 孙建红. 圆柱跨声速绕流中的激波/湍流相互作用大涡模拟研究[J]. 空气动力学学报, 2012,30(1): 22-27.(XU Chang-yue, WANG Cong-lei, SUN Jian-hong. Large eddy simulation of shock-wave/turbulence interaction in the transonic flow over a circular cylinder[J].Acta Aerodynamica Sinica,2012,30(1): 22-27.(in Chinese))
[8]	Vlachos P P, Telionis D P. The effect of free surface on the vortex shedding from inclined circular cylinder[J].Journal of Fluid Engineering,2008,130(2): 021103.
[9]	Hogan J D, Hall J W. Experimental study of pressure fluctuations from yawed circular cylinder[J].AIAA Journal,2011,49(11): 2349-2356.
[10]	Meunier P. Stratified wake of a tilted cylinder—part 1: suppression of a von Krmn vortex street[J].Journal of Fluid Mechanics,2012,699: 174-197.
[11]	Moin P, Mahesh K. Direct numerical simulation: a tool in turbulence research[J].Annual Review of Fluid Mechanics,1998,30: 539-578.
[12]	Xu C Y, Zhao L Q, Sun J H. Large-eddy simulation of the compressible flow past a tabbed cylinder[J].Chinese Science Bulletin,2012,57(24): 3203-3210.
[13]	Xu C Y, Chen L W, Lu X Y. Large-eddy simulation of the compressible flow past a wavy cylinder[J].Journal of Fluid Mechanics,2010,665: 238-273.
[14]	Chen L W, Lu X Y, Xu C Y. Numerical investigation of the compressible flow past an aerofoil[J].Journal of Fluid Mechanics,2010,643: 97-126.
[15]	Chen L W, Lu X Y, Xu C Y. Large-eddy simulation of opposing-jet-perturbed supersonic flows past a hemispherical nose[J].Modern Physics Letters B,2010,24(13): 1287-1290.
[16]	Berkooz G, Holmes P, Lumley J L. The proper orthogonal decomposition in the analysis of turbulent flows[J].Annual Review of Fluid Mechanics,1993,25: 539-575.
[17]	Prasad A, Williamson C H K. The instability of the shear layer separating from a bluff body[J].Journal of Fluid Mechanics,1997,333: 375-402.
[18]	Zeman O. Dilatation dissipation:the concept and application in modeling compressible mixing layers[J].Physics of Fluids A,1990,2: 178-188.
[19]	Andreopoulos Y, Agui J H, Briassulis G. Shock wave-turbulence interactions[J].Annual Review of Fluid Mechanics,2000,32: 309-345.