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Research Papers: Ocean Engineering

Turbulence Over a Pair of Submerged Hemispheres in Presence of Surface Waves and Following Current

[+] Author and Article Information
Krishnendu Barman

Department of Aerospace Engineering
and Applied Mechanics,
Indian Institute of Engineering
Science and Technology (IIEST),
Shibpur,
Howrah 711103, West Bengal, India
e-mail: krishnendubarman07@gmail.com

Koustuv Debnath

Professor
Department of Aerospace Engineering
and Applied Mechanics,
Indian Institute of Engineering
Science and Technology (IIEST),
Shibpur,
Howrah 711103, West Bengal, India
e-mail: debnath_koustuv@yahoo.com

Bijoy S. Mazumder

Department of Aerospace Engineering
and Applied Mechanics,
Indian Institute of Engineering
Science and Technology (IIEST),
Shibpur,
Howrah 711103, West Bengal, India
e-mail: mprof_bijoy@yahoo.in

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received June 7, 2017; final manuscript received November 9, 2017; published online January 2, 2018. Assoc. Editor: David R. Fuhrman.

J. Offshore Mech. Arct. Eng 140(3), 031104 (Jan 02, 2018) (10 pages) Paper No: OMAE-17-1087; doi: 10.1115/1.4038677 History: Received June 07, 2017; Revised November 09, 2017

The paper presents an experimental study in a laboratory flume to investigate the combined wave–current flow over a pair of hemispherical obstacles placed at a relative spacing L/d = 4, where L is a center to center distance between the obstacles and d is the obstacle height. Detailed velocity data were collected using three-dimensional micro-acoustic Doppler velocimeter from upstream to downstream of the pair of obstacles along the centerline of the flume. This study examines the mean flows, eddy viscosity, mixing length, turbulence kinetic energy (TKE) flux under the influence of two hemispherical obstacles in combined wave–current flow conditions. The analysis reveals that higher level of turbulence including maximum eddy viscosity and TKE flux is observed near the top of the obstacles. Further, the power spectral density (PSD) for velocity fluctuation is also analyzed to study the internal structure of turbulence due to combined wave–current flow over hemispherical obstacles.

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Figures

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Fig. 1

Schematic diagram of an experimental setup showing the test section and coordinate system

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Fig. 2

Plots of the normalized error for the mean flow at z/h = 0.16 for f = 1 Hz and 2 Hz

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Fig. 3

Normalized streamwise velocity profiles for current-only and superimposed wave frequencies, f = 1 Hz and f = 2 Hz cases over the pair of hemispheres

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Fig. 4

Comparison of normalized eddy viscosity over a pair of hemispheres for current-only and superimposed wave-induced cases for the locations V1–V8

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Fig. 5

Comparison of normalized mixing length over a pair of hemispheres for current-only and superimposed wave-induces cases for the locations V1–V8

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Fig. 6

Distributions of streamwise turbulent kinetic energy flux over a pair of hemispheres for current-only and wave-induced cases for the locations V1–V8

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Fig. 7

Distributions of bottom-normal turbulent kinetic energy flux over a pair of hemispheres for current-only and wave-induced cases for the locations V1–V8

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Fig. 8

Power spectra of streamwise velocity components in presence of with/without surface wave (a) current only (f = 0 Hz), (b) wave frequency, f = 1 Hz, and (c) wave frequency, f = 2 Hz at z/h = 0.07 for the vertical locations V1, V3, V5, and V7

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Fig. 9

Power spectra of streamwise velocity components in presence of with/without surface wave (a) current-only (f = 0 Hz), (b) wave frequency, f = 1 Hz and (c) wave frequency, f = 2 Hz at z/h = 0.14 (top of the hemispheres) for the locations V1, V3, V5, and V7

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