WFRF:(Pozuelo Ramon)
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An adverse-pressure-gradient turbulent boundary layer with nearly constant beta similar or equal to 1.4 up to Re-theta similar or equal to 8700
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- Pozuelo, Ramon (författare)
- KTH,Strömningsmekanik och Teknisk Akustik,Linné Flow Center, FLOW
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- Li, Qiang (författare)
- KTH,Strömningsmekanik och Teknisk Akustik,Linné Flow Center, FLOW
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- Schlatter, Philipp (författare)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik
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- (creator_code:org_t)
- 2022-04-01
- 2022
- Engelska.
- Ingår i: Journal of Fluid Mechanics. - : Cambridge University Press (CUP). - 0022-1120 .- 1469-7645. ; 939
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- In this study, a new well-resolved large-eddy simulation of an incompressible near-equilibrium adverse-pressure-gradient (APG) turbulent boundary layer (TBL) over a flat plate is presented. In this simulation, we have established a near-equilibrium APG over a wide Reynolds-number range. In this so-called region of interest, the Rotta-Clauser pressure-gradient parameter beta exhibits an approximately constant value of around 1.4, and the Reynolds number based on momentum thickness reaches Re-theta = 8700. To the best of the authors' knowledge, this is to date the highest Re-theta achieved for a near-equilibrium APG TBL under an approximately constant moderate APG. We evaluated the self-similarity of the outer region using two scalings, namely the Zagarola-Smits and an alternative scaling based on edge velocity and displacement thickness. Our results reveal that outer-layer similarity is achieved, and the viscous scaling collapses the near-wall region of the mean flow in agreement with classical theory. Spectral analysis reveals that the APG displaces some small-scale energy from the near-wall to the outer region, an effect observed for all the components of the Reynolds-stress tensor, which becomes more evident at higher Reynolds numbers. In general, the effects of the APG are more noticeable at lower Reynolds numbers. For instance, the outer peak of turbulent-kinetic-energy (TKE) production is less prominent at higher Re. Although the scale separation increases with Re in zero-pressure-gradient TBLs, this effect becomes accentuated by the APG. Despite the reduction of the outer TKE production at higher Reynolds numbers, the mechanisms of energisation of large scales are still present.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- turbulence simulation
- turbulent boundary layers
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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- Pozuelo, Ramon
- Li, Qiang
- Schlatter, Phili ...
- Vinuesa, Ricardo
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- TEKNIK OCH TEKNOLOGIER
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