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- Vinuesa, RicardoKTH,Linné Flow Center, FLOW (author)
Direct numerical simulations of variable-aspect-ratio turbulent duct flows at low to moderate reynolds numbers
- Article/chapterEnglish2013
Publisher, publication year, extent ...
- TSFP-8,2013
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:kth-280424
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280424URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
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Notes
- QC 20200921
- Three-dimensional effects in turbulent duct flows, i.e., side-wall boundary layers and secondary motions, are studied by means of direct numerical simulations (DNS). The spectral element code Nek5000 is used to compute turbulent duct flows with aspect ratios 1 to 7 (at Reb, c = 2800, Reτ 180) and 1 (at Reb, c = 5600, Reτ 330) in streamwiseperiodic boxes of length 25h. The total number of grid points ranges from 28 to 145 million, and the fluid kinematic viscosity n was adjusted iteratively in order to keep the same bulk Reynolds number at the centerplane with changing aspect ratio. Spanwise variations in wall shear, mean-flow profiles and turbulence statistics are analyzed with aspect ratio, and also compared with the 2D channel. These computations show good agreement with experimental measurements carried out at IIT in parallel, and reinforces one important conclusion: the conditions obtained in the core region of a high-aspect-ratio duct cannot exactly be reproduced by spanwise-periodic DNSs of turbulent channel flows.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Maskinteknik Strömningsmekanik och akustik hsv//swe
- ENGINEERING AND TECHNOLOGY Mechanical Engineering Fluid Mechanics and Acoustics hsv//eng
- Boundary layers
- C (programming language)
- Channel flow
- Direct numerical simulation
- Ducts
- Numerical models
- Reynolds number
- Shear flow
- Turbulence
- Wall flow
- High aspect ratio
- Mean flow profiles
- Moderate Reynolds numbers
- Spanwise variations
- Spectral element
- Three dimensional effect
- Turbulence statistics
- Turbulent channel flows
- Aspect ratio
Added entries (persons, corporate bodies, meetings, titles ...)
- Noorani, AzadKTH,Teknisk mekanik(Swepub:kth)u156fwlw (author)
- Lozano-Durán, A. (author)
- El-khoury, Jad,1975-KTH,Maskinkonstruktion (Inst.)(Swepub:kth)u1kps4qd (author)
- Schlatter, PhilippKTH,Linné Flow Center, FLOW(Swepub:kth)u18wf7mg (author)
- Fischer, P. F. (author)
- Nagib, H. M. (author)
- KTHLinné Flow Center, FLOW (creator_code:org_t)
Related titles
- In:International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013: TSFP-89780000000002
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