Structure of turbulent boundary layer subjected to adverse pressure gradient

Nagano, Yasutaka; Tsuji, Tomohiro; Houra, Tomoya

doi:10.1016/s0142-727x(98)10013-9

Cited by 87 publications

(53 citation statements)

References 24 publications

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“…The present results (consistent with those of Spalart & Watmuff 1993) also imply that, while it is apparently valid for some deceleration histories (e.g. Nagano et al 1997), the assumption that the turbulence is unaltered as it convects along outer-layer streamlines until reached by diffusing inner-layer effects should not automatically be made for all APG boundary layers.…”

Section: Summary and Concluding Remarkssupporting

confidence: 87%

Direct numerical simulation of a decelerated wall-bounded turbulent shear flow

2003

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A fully developed turbulent channel flow is subjected to a mean strain that approximates that in a spatially developing adverse-pressure-gradient (APG) boundary layer. This is done by applying uniform irrotational temporal deformations to the flow domain of a conventional direct numerical simulation channel code. The velocity difference between the inner and outer layer is also controlled by accelerating the walls in the streamwise plane, in order to duplicate the defining features of both the inner and outer regions of an APG boundary layer. Eventually, the flow reverses at the wall. We address basic physics and modelling issues, and create a database that makes detailed testing of turbulence models easy. As in the corresponding spatial layers, distinct inner-and outer-layer dynamics are observed: a decrease in turbulence intensity near the wall is accompanied by increased energy in the outer layer. The 'extra strain' effect associated with the diverging outer-layer streamlines is documented, particularly in the Reynolds-stress budgets. IntroductionThis paper is a continuation of an earlier numerical study of three-dimensional wallbounded shear flows (Coleman, Kim & Spalart 2000, hereinafter referred to as CKS). In that work we examined the response of wall-bounded turbulence to the strain fields induced by streamwise and spanwise pressure gradients, as they introduce mean threedimensionality into an originally two-dimensional boundary layer. We found, among other things, that the turbulence is much more sensitive to the mean streamwise deceleration (∂U/∂x < 0) and/or wall-normal stretching (∂V /∂y > 0) than it is to mean skewing (∂W/∂x = ∂U/∂z). (The x-, y-and z-coordinates, respectively, indicate the streamwise, wall-normal, and spanwise directions, aligned with the upstream twodimensional flow.) This led us to consider the case presented here, where the strain field imitates a simpler two-dimensional non-equilibrium adverse-pressure gradient (APG) boundary layer. (We use 'non-equilibrium' as a synonym for 'perturbed' or 'non-stationary', to indicate a flow subjected to a relatively rapid change of the mean field and the ensuing finite-time-lag response of the turbulence.) Our aim is to better understand the physics of a prototypical perturbed wall-bounded shear layer, and ultimately improve turbulence models when applied to APG flows of engineering interest. As in the previous study, we employ direct numerical simulation (DNS) of a strained-channel flow (but at higher Reynolds number), with a focus upon the

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Section: Summary and Concluding Remarkssupporting

confidence: 87%

Direct numerical simulation of a decelerated wall-bounded turbulent shear flow

2003

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“…10 for the resolved vector field above the wall, y + > 10 . It shows a departure from the log-law expected from a flat plate boundary layer measurement, and instead follows the trend expected for a boundary layer in an adverse pressure gradient (Nagano et al 1998;Lee and Sung 2008), which is the case at this location over the airfoil surface.…”

Section: Mean Flow Characterization Of the Turbulent Boundary Layersupporting

confidence: 44%

Boundary layer characterization and acoustic measurements of flow-aligned trailing edge serrations

et al. 2016

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“…In this case (Figure 2b), at y + ≈ both measurements exhibit the so called outer peak, which has been observed by many authors [13][14][15] for turbulent boundary layer subjected to adverse pressure gradient. The inner peak at this location is almost invisible.…”

Section: Discussion Of the Resultssupporting

confidence: 74%

Analysis of hot-wire measurements accuracy in turbulent boundary layer

Dróżdż

Elsner

2015

Open Engineering

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This paper discusses the issue of measuring velocity uctuations of turbulent boundary layer using hotwire probes. The study highlights the problem of spatial resolution, which is essential when measuring smallscales in wall-bounded ows. Additionally, attention was paid to the inconsistency in streamwise uctuation measurements using single-and X-wire probes. To clarify this problem, the energy spectra using wavelet transformation were calculated. The analysis was performed for turbulent boundary layer ow, which was characterized by Reynolds number based on the friction velocity equal Reτ ≈ .

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Structure of turbulent boundary layer subjected to adverse pressure gradient

Cited by 87 publications

References 24 publications

Direct numerical simulation of a decelerated wall-bounded turbulent shear flow

Direct numerical simulation of a decelerated wall-bounded turbulent shear flow

Boundary layer characterization and acoustic measurements of flow-aligned trailing edge serrations

Analysis of hot-wire measurements accuracy in turbulent boundary layer

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