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On minimum aspect ratio for experimental duct flow facilities
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.ORCID iD: 0000-0001-6570-5499
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2016 (English)In: 2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014, Springer, 2016, 201-211 p.Conference paper (Refereed)
Abstract [en]

To the surprise of some of our colleagues, we recently recommended aspect ratios of at least 24 (instead of accepted values over last few decades ranging from 5 to 12) to minimize effects of sidewalls in turbulent duct flow experiments, in order to approximate the two-dimensional channel flow. Here we compile avail- able results from hydraulics and civil engineering literature, where this was already documented in the 1980s. This is of great importance due to the large amount of computational studies (mainly Direct Numerical Simulations) for spanwise-periodic turbulent channel flows, and the extreme complexity of constructing a fully developed duct flow facility with aspect ratio of 24 for high Reynolds number with adequate probe resolution. Results from this nontraditional literature for the turbulence com- munity are compared to our recent database of DNS of turbulent duct flows with aspect ratios ranging from 1 to 18 and Reτ,c ≃ 180 and 330, leading to very good agreement between their experimental and our computational results. © Springer International Publishing Switzerland 2016.

Place, publisher, year, edition, pages
Springer, 2016. 201-211 p.
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-195149DOI: 10.1007/978-3-319-20388-1_18ScopusID: 2-s2.0-84964867144ISBN: 9783319203874OAI: diva2:1044791
18 June 2014 through 20 June 2014

Correspondence Address: Nagib, H.M.; MMAE Department, Illinois Institute of TechnologyUnited States; email: QC 20161107

Available from: 2016-11-07 Created: 2016-11-02 Last updated: 2016-11-07Bibliographically approved

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