Skip to main content
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
1.S. A. Berger, L. Talbot, and L.-S. Yao, “Flow in curved pipes,” Annu. Rev. Fluid Mech. 15, 461512 (1983).
2.A. Noorani, G. K. El Khoury, and P. Schlatter, “Evolution of turbulence characteristics from straight to curved pipes,” Int. J. Heat Fluid Flow 41, 1626 (2013).
3.M. J. Tunstall and J. K. Harvey, “On the effect of a sharp bend in a fully developed turbulent pipe flow,” J. Fluid Mech. 34, 595608 (1968).
4.A. Kalpakli and R. Örlü, “Turbulent pipe flow downstream a 90° pipe bend with and without superimposed swirl,” Int. J. Heat Fluid Flow 41, 103111 (2013).
5.F. Rütten, W. Schröder, and M. Meinke, “Large-eddy simulation of low frequency oscillations of the Dean vortices in turbulent pipe bend flows,” Phys. Fluids 17, 035107 (2005).
6.J. Sakakibara and N. Machida, “Measurement of turbulent flow upstream and downstream of a circular pipe bend,” Phys. Fluids 24, 041702 (2012).
7.L. H. O. Hellstöm, M. B. Zlatinov, G. Cao, and A. J. Smits, “Turbulent pipe flow downstream of a 90° bend,” J. Fluid Mech. 735, R7 (2013).
8.K. C. Kim and R. J. Adrian, “Very large-scale motion in the outer layer,” Phys. Fluids 11, 417 (1999).
9.A. J. Smits, B. J. McKeon, and I. Marusic, “High-Reynolds number wall turbulence,” Annu. Rev. Fluid Mech. 43, 353375 (2011).
10.M. Guala, S. E. Hommema, and R. J. Adrian, “Large-scale and very-large-scale motions in turbulent pipe flow,” J. Fluid Mech. 554, 521542 (2006).
11.J. P. Monty, J. A. Stewart, R. C. Williams, and M. S. Chong, “Large-scale features in turbulent pipe and channel flows,” J. Fluid Mech. 589, 147156 (2007).
12.S. C. C. Bailey and A. J. Smits, “Experimental investigation of the structure of large- and very-large-scale motions in turbulent pipe flow,” J. Fluid Mech. 651, 339356 (2010).
13.X. Wu, J. R. Baltzer, and R. J. Adrian, “Direct numerical simulation of a 30r long turbulent pipe flow at r+=685: Large-and very large-scale motions,” J. Fluid Mech. 698, 235281 (2012).
14.Y. Hwang and C. Cossu, “Self-sustained process at large scales in turbulent channel flow,” Phys. Rev. Lett. 105, 044505 (2010).
15.Y. Hwang and C. Cossu, “Self-sustained processes in the logarithmic layer of turbulent channel flows,” Phys. Fluids 23, 061702 (2011).
16.J. C. del Álamo and J. Jiménez, “Linear energy amplification in turbulent channels,” J. Fluid Mech. 559, 205213 (2006).
17.O. Flores, J. Jiménez, and J. C. del Álamo, “Vorticity organization in the outer layer of turbulent channels with disturbed walls,” J. Fluid Mech. 591, 145154 (2007).
18.S. S. Sattarzadeh, “Experimental study of complex pipe flows,” Master’s thesis, Royal Institute of Technology, Stockholm, 2011.
19.J. L. Lumley, “The structure of inhomogeneous turbulent flows,” in Atmospheric Turbulence and Radio Wave Propagation, edited by V. I. Tatarsky and A. M. Yaglom (Nauka, Moscow, 1967), pp. 166178.
20.L. Sirovich, “Turbulence and the dynamics of coherent structures,” Q. Appl. Math. 45, 561590 (1987).
21.G. K. E. Khoury, P. Schlatter, A. Noorani, P. F. Fischer, G. Brethouwer, and A. V. Johansson, “Direct numerical simulation of turbulent pipe flow at moderately high Reynolds numbers,” Flow, Turbul. Combust. 91, 475495 (2013).

Data & Media loading...


Article metrics loading...



Turbulent flow through 90° pipe bends, for four different curvatures, has been investigated using large eddy simulations. In particular, the origin of the so-called swirl switching phenomenon, which is a large scale oscillation of the flow after the bend, has been studied for different bend curvature ratios. A classification of the phenomenon into a high and a low frequency switching, with two distinct physical origins, is proposed. While the high frequency switching stems from modes formed at the bend, and becomes increasingly important for sharp curvatures, the low frequency switching originates from very-large-scale motions created in the upstream pipe flow.


Full text loading...


Access Key

  • FFree Content
  • OAOpen Access Content
  • SSubscribed Content
  • TFree Trial Content
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd