Large-scale energy in turbulent boundary layers: Reynolds-number and pressure-gradient effects

Large-scale energy in turbulent boundary layers : Reynolds-number and pressure-gradient effects

QC 20200511
Adverse-pressure-gradient (APG) turbulent boundary layers (TBLs) are studied using hot-wire measurements which cover a Clauser pressure-gradient-parameter range up to β ≈ 2.4. Constant and non-constant β distributions with the same upstream history are studied. The pre-multiplied power-spectral density is employed to study the differences in the large-scale energy content throughout the boundary layer. Two different large-scale phenomena are identified, the first one due to the pressure gradient and the second one due to the Reynolds number; the latter is also present in high-Re ZPG TBLs. A decomposition of the streamwise velocity fluctuations using a temporal filter shows that the small-scale velocity fluctuations do not scale in APG TBL flows since the effect of the large-scale features extends up to the near-wall region.

TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
Atmospheric thermodynamics
Boundary layer flow
Pressure gradient
Reynolds number
Spectral density
Titanium compounds
Turbulence
Turbulent flow
Adverse pressure gradient
Beta distributions
Near-wall region
Pressure-gradient parameters
Small-scale velocity
Stream-wise velocities
Temporal filters
Turbulent boundary layers
Boundary layers

Vinuesa, RicardoKTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik(Swepub:kth)u12xffui (författare)
Discetti, S. (författare)
Ianiro, A. (författare)
Schlatter, P. (författare)
Örlü, Ramis,1977-KTH,Linné Flow Center, FLOW,Competence Center for Gas Exchange (CCGEx),SeRC - Swedish e-Science Research Centre,Strömningsmekanik och Teknisk Akustik(Swepub:kth)u1qqxino (författare)
KTHLinné Flow Center, FLOW (creator_code:org_t)

Av författaren/redakt...: Sanmiguel Vila, ...; Vinuesa, Ricardo; Discetti, S.; Ianiro, A.; Schlatter, P.; Örlü, Ramis, 197 ...

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TEKNIK OCH TEKNOLOGIER: TEKNIK OCH TEKNO ...; och Maskinteknik; och Strömningsmekani ...

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