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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.2017017342
pages 169-183

TURBULENT WAKES BEHIND BED-MOUNTED HEMISPHERES IN CO-EXISTING SURFACE WAVE

Krishnendu Barman
Assistant Professor
Koustuv Debnath
Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur 603203, India

RÉSUMÉ

The objective of this research is to examine the turbulent flow characteristics at the wake region of artificial single and dual hemispheres fixed to the bottom wall of an open channel under wave and current interaction. The effect of surface wave on the mean velocity, turbulence intensities, and Reynolds shear stress profiles over hemispherical obstacles has been presented in this paper. All three velocity components with fluctuations were measured using 3D micro-acoustic Doppler velocimeter. The study was carried out at the submergence ratio, h/h' = 7.1 where h = flow depth and h' = obstacle height and three different wave frequencies f = 0.5, 1, and 2 Hz, respectively. On the basis of quadrant analysis, the contribution of stress fractions to the Reynolds shear stress corresponding to each quadrant event at the wake region of hemispheres is presented to evaluate the turbulent bursting events. Furthermore, the power spectral density for the velocity fluctuation was analyzed to evaluate the distribution of energy at the different scales of fluctuation.


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