Unsteady turbulent boundary layers in swimming rainbow trout

The Journal of Experimental Biology
Kazutaka Yanase, Pentti Saarenrinne

Abstract

The boundary layers of rainbow trout, Oncorhynchus mykiss, swimming at 1.02±0.09 L s(-1) (mean±s.d., N=4), were measured by the particle image velocimetry (PIV) technique at a Reynolds number of 4×10(5). The boundary layer profile showed unsteadiness, oscillating above and beneath the classical logarithmic law of the wall with body motion. Across the entire surface regions that were measured, local Reynolds numbers based on momentum thickness, which is the distance that is perpendicular to the fish surface through which the boundary layer momentum flows at free-stream velocity, were greater than the critical value of 320 for the laminar-to-turbulent transition. The skin friction was dampened on the convex surface while the surface was moving towards a free-stream flow and increased on the concave surface while retreating. These observations contradict the result of a previous study using different species swimming by different methods. Boundary layer compression accompanied by an increase in local skin friction was not observed. Thus, the overall results may not support absolutely the Bone-Lighthill boundary layer thinning hypothesis that the undulatory motions of swimming fish cause a large increase in their friction drag beca...Continue Reading

References

Feb 13, 2003·The Journal of Experimental Biology·James C LiaoMichael S Triantafyllou
Dec 4, 2003·Science·James C LiaoMichael S Triantafyllou
Feb 10, 2004·The Journal of Experimental Biology·Paul W Webb
Jul 13, 2004·Physical Review Letters·Victor S L'vovVasil Tiberkevich
Aug 19, 2008·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Matthew J McHenrySietse M van Netten
Nov 1, 2002·Integrative and Comparative Biology·M S TriantafyllouD K P Yue

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Citations

Dec 15, 2017·Bioinspiration & Biomimetics·Meghali BoraMichael S Triantafyllou
May 29, 2018·Journal of Morphology·Madeleine V AnkhelyiGeorge V Lauder
Jul 19, 2018·Bioinspiration & Biomimetics·August G DomelGeorge V Lauder
Oct 11, 2017·Scientific Reports·Emily HermanMark van der Giezen
Aug 4, 2019·The Journal of Experimental Biology·Muthukumar MuthuramalingamChristoph Bruecker

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