Turbulent boundary layer drag reduction using an oscillating wall

Trujillo, S. M.; BogarcT, David G.; Ball, Kenneth S.

doi:10.2514/6.1997-1870

Cited by 43 publications

(54 citation statements)

References 13 publications

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“…Instead, they presented a scaling function linking the input parameters to the level of drag reduction. They proposed a combined parameter V Baron & Quadrio (1996) 200 4.3, 8.7, 13, 17.3 100 Choi et al (2002 100 1, 5, 10, 20 1, 5, 10, 20, 50, 100, 150, 200 200, 400 5, 10, 20 50, 100, 150, 200 Quadrio & Ricco (2003) 200 3, 6, 9, 18, 27 50, 75, 100, 125, 150, 200 Quadrio & Ricco (2004 Laadhari et al (1994) 450 D + m = 160 60 ∼ 300 Trujillo et al (1997) 670 1 ∼ 18 55 ∼ 330 550 Bogard et al (2000) 250 D case was again shown. An interesting feature of their simulations is that the change in the drag reduction, when the Reynolds number was increased from Re τ = 200 to 400, was larger for higher values of T + .…”

Section: Reynolds Number Effectmentioning

confidence: 99%

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

2014

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP url' above for details on accessing the published version and note that access may require a subscription For more information, please contact the WRAP Team at: wrap@warwick.ac.ukUnder consideration for publication in J. Fluid Mech. 1The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves This paper exploits the turbulent flow control method using streamwise travelling waves ) to study the effect of Reynolds number on turbulent skin-friction drag reduction. Direct numerical simulations of a turbulent channel flow subjected to the streamwise travelling waves of spanwise wall velocity have been performed at Reynolds numbers ranging from Re τ = 200 to 1600. To the best of the authors' knowledge, this is the highest Reynolds number attempted with DNS for this type of flow control. The present DNS results confirm that the effectiveness of drag reduction deteriorates, and the maximum drag reduction achieved by travelling waves decreases significantly as the Reynolds number increases. The intensity of both the drag reduction and drag increase is reduced with the Reynolds number. Another important finding is that the value of the optimal control parameters changes, even in wall units, when the Reynolds number is increased. This trend is observed for the wall oscillation, stationary wave, and streamwise travelling wave cases. This implies that, when the control parameters used are close to optimal values found at a lower Reynolds number, the drag reduction deteriorates rapidly with increased Reynolds number. In this study, the effect of Reynolds number for the travelling wave is quantified using a scaling in the form Re −α τ . No universal constant is found for the scaling parameter α. Instead, the scaling parameter α has a wide range of values depending on the flow control conditions. Further Reynolds number scaling issues are discussed. Turbulent statistics are analysed to explain a weaker drag reduction observed at high Reynolds numbers. The changes in the Stokes layer and also the mean and r.m.s. velocity with the Reynolds number are also reported. The Reynolds shear stress analysis suggests an interesting possibility of a finite drag reduction at very high Reynolds numbers.

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Section: Reynolds Number Effectmentioning

confidence: 99%

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

2014

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“…As the mechanics of the different types of drag reduction are studied, most explanations of the mechanism revolve around controlling the streamwise vortices and low speed streaks. 2,3 One such method of achieving drag reduction is spanwise wall oscillation, first discovered by Jung et al 4 in 1992, and later confirmed both numerically [4][5][6][7][8] and experimentally, [9][10][11][12][13] to reduce drag on the order of 45%. The prevalent theory of the mechanism behind this was developed using direct numerical simulation of a turbulent channel flow by Choi et al 6 and experimentally confirmed by Choi and Clayton, 14 showing that the spatial correlation between the streamwise vortices and the low speed streaks are modified so that high speed fluid is ejected from the wall, and low speed fluid is swept towards the wall.…”

Section: Introductionmentioning

confidence: 99%

The effect of spanwise wall oscillation on turbulent pipe flow structures resulting in drag reduction

2007

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The results of a comparative analysis based upon a Karhunen–Loève expansion of turbulent pipe flow and drag reduced turbulent pipe flow by spanwise wall oscillation are presented. The turbulent flow is generated by a direct numerical simulation at a Reynolds number Reτ=150. The spanwise wall oscillation is imposed as a velocity boundary condition with an amplitude of A+=20 and a period of T+=50. The wall oscillation results in a 27% mean velocity increase when the flow is driven by a constant pressure gradient. The peaks of the Reynolds stress and root-mean-squared velocities shift away from the wall and the Karhunen–Loève dimension of the turbulent attractor is reduced from 2763 to 1080. The coherent vorticity structures are pushed away from the wall into higher speed flow, causing an increase of their advection speed of 34% as determined by a normal speed locus. This increase in advection speed gives the propagating waves less time to interact with the roll modes. This leads to less energy transfer and a shorter lifespan of the propagating structures, and thus less Reynolds stress production which results in drag reduction.

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“…After that, lots of researchers carried out the numerical (Baron et al [4] , Orlandi et al [5] , Dhanak et al [6] , Quadrio et al [7] , Choi et al [8] , Huang et al [9,10] , Quadrio et al [11] , Zhou et al [12] , Riccoa et al [13] ) and experimental (Trujillo et al. [14] , Choi et al [15][16][17][18] , Cicca et al [19] , Iuso et al [20] , Ricco et al [21] ) researches on this problem, and they came to the consistent results with those of Jung et al [1,2] . Among them, Orlandi et al [5] , Quadrio et al [7] and Choi et al [16] carried out the numerical and experimental researches on the pipe flow oscillating around its axis.…”

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confidence: 99%

Large eddy simulation of compressible turbulent channel flow with spanwise wall oscillation

Fang

Shao

2009

Sci. China Ser. G-Phys. Mech. Astron.

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The influences of the modification of turbulent coherent structures on temperature field and heat transfer in turbulent channel flow are studied using large eddy simulation (LES) of compressible turbulent channel flows with spanwise wall oscillation (SWO). The reliability of the LES on such problems is proved by the comparisons of the drag reduction data with those of other researches. The high consistency of coherent velocity structures and temperature structures is found based on the analyses of the turbulent flow field. When the coherent velocity structures are suppressed, the transportations of momentum and heat are reduced simultaneously, demonstrating the same trend. This shows that the turbulent coherent structures have the same effects on the transportations of momentum and heat. The averaged wall heat flux can be reduced with appropriate oscillating parameters.large eddy simulation, spanwise wall oscillation, compressible, temperature field, heat transportation

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Turbulent boundary layer drag reduction using an oscillating wall

Cited by 43 publications

References 13 publications

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

The effect of Reynolds number on turbulent drag reduction by streamwise travelling waves

The effect of spanwise wall oscillation on turbulent pipe flow structures resulting in drag reduction

Large eddy simulation of compressible turbulent channel flow with spanwise wall oscillation

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