0
Research Papers: Ocean Engineering

Effect of Surface Wave on Development of Turbulent Boundary Layer Over a Train of Rib Roughness

[+] Author and Article Information
Santosh Kumar Singh

Department of Mechanical Engineering,
SRM Institute of Science and Technology,
Kattankulathur 603203, Tamil Nadu, India
e-mail: fmsks84@gmail.com

Pankaj Kumar Raushan

Fluid Mechanics and Hydraulics Laboratory,
Department of Aerospace Engineering and Applied Mechanics,
Indian Institute of Engineering Science and Technology (IIEST),
Shibpur, Howrah 711103, West Bengal, India
e-mail: pankaj.raushan101@yahoo.com

Koustuv Debnath

Fluid Mechanics and Hydraulics Laboratory,
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

B. S. Mazumder

Fluid Mechanics and Hydraulics Laboratory,
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 August 4, 2017; final manuscript received January 23, 2019; published online March 20, 2019. Assoc. Editor: David R. Fuhrman.

J. Offshore Mech. Arct. Eng 141(6), 061101 (Mar 20, 2019) (10 pages) Paper No: OMAE-17-1138; doi: 10.1115/1.4042939 History: Received August 04, 2017; Accepted January 31, 2019

In this paper, detailed experimental results are reported to study the effect of the surface wave of different frequencies on unidirectional current over the bed-mounted train of rib roughness. The model roughness used in this study is transverse square ribs that lengthened across the entire width of the recirculating wave channel. The center-to-center rib pitch (P) was constant during the experiments, thus generating a broad range of near-bed flow patterns for each of the three different surface wave frequencies studied here. The relative submergence associated with the roughness height (k) was 8, which fall in the category of large roughness. Velocity measurements were conducted using acoustic Doppler velocimeter (ADV), and a surface wave of different frequencies was generated using the plunger-type wavemaker. The measured velocity data were analyzed to determine the relative importance of mean flow over the train of rib roughness. Mean velocity profiles illustrate the well-known downward shift from the flat surface data of the semi-logarithmic portion of the law of the wall. The width of the turbulent boundary layer increases with the superposition of surface wave compared to that of the current-only flow. The results also show that the mean reattachment length decreases due to the superposition of surface wave on unidirectional current.

FIGURES IN THIS ARTICLE
<>
Copyright © 2019 by ASME
Your Session has timed out. Please sign back in to continue.

References

Miyake, Y., Tsujimoto, K., and Agata, Y., 2001, “Direct Numerical Simulation of Rough Wall Heat Transfer in a Turbulent Channel Flow,” Int. J. Heat Fluid Flow, 22, pp. 237–244. [CrossRef]
Krogstad, P. A., Andersson, H. I., Bakken, O. M., and Ashrafian, A., 2005, “An Experimental and Numerical Study of Channel Flow with Rough Walls,” J. Fluid Mech., 530, pp. 327–352. [CrossRef]
Leonardi, S., Orlandi, P., and Antonia, R. A., 2007, “Properties of d- and k-Type Roughness in a Turbulent Channel Flow,” Phys. Fluids, 19, pp. 125101–125106. [CrossRef]
Stoesser, T., and Nikora, V., 2008, “Flow Structure Over Square Bars at Intermediate Submergence: Large-Eddy Simulation Study of Bar Spacing Effect,” Acta Geophys., 56, pp. 876–893. [CrossRef]
Shamloo, H., and Pirzadeh, B., 2015, “Analysis of Roughness Density and Flow Submergence Effects on Turbulence Flow Characteristics in Open Channels Using a Large Eddy Simulation,” Appl. Math. Model., 39, pp. 1074–1086. [CrossRef]
Agelinchaab, M., and Tachie, M. F., 2006, “Open Channel Turbulent Flow Over Hemispherical Ribs,” Int. J. Heat Fluid Flow, 27, pp. 1010–1027. [CrossRef]
Roussinova, V., and Balachandar, R., 2011, “Open Channel Flow Past a Train of Rib Roughness,” J. Turbul., 12, pp. 1–17. [CrossRef]
Singh, S. K., Raushan, P. K., Debnath, K., and Mazumder, B. S., 2018, “Turbulent Oscillatory Flow Along Unidirectional Current Over Square Ribs,” Can. J. Civ. Eng., 45, pp. 248–262. [CrossRef]
Mathisen, P. P., and Madsen, O. S., 1996, “Wave and Currents Over a Fixed Rippled Bed: 1. Bottom Roughness Experienced by Waves in the Presence and Absence of Current,” J. Geophys. Res., 101, pp. 16533–16542. [CrossRef]
Mathisen, P. P., and Madsen, O. S., 1996, “Wave and Currents Over a Fixed Rippled Bed: 2. Bottom and Apparent Roughness Experienced by Currents in the Presence of Waves,” J. Geophys. Res., 101, pp. 16543–16550. [CrossRef]
Fredsoe, J., Andersen, K. H., and Sumer, B. M., 1999, “Wave Plus Current Over a Ripple Covered Bed,” Coastal Eng., 38, pp. 177–221. [CrossRef]
Mehdizadeh, A., Firoozabadi, B., and Farhanieh, B., 2008, “Numerical Simulation of Turbidity Current Using v2¯–f Turbulence Model,” J. Appl Fluid Mech., 1, pp. 45–55. http://jafmonline.net/JournalArchive/download?file_ID=15222&issue_ID=198
Ojha, S. P., and Mazumder, B. S., 2010, “Turbulence Characteristics of Flow Over a Series of 2-D Bed Forms in the Presence of Surface Waves,” J. Geophys. Res., 115, pp. 1–15. [CrossRef]
Banerjee, T., Muste, M., and Katual, G., 2015, “Flume Experiments on Wind Induced Flow in Static Water Bodies in the Presence of Protruding Vegetation,” Adv. Water Resour., 76, pp. 11–28. [CrossRef]
Singh, S. K., Debnath, K., and Mazumder, B. S., 2016, “Spatially-Averaged Turbulent Flow Over Cubical Roughness in Wave-Current Co-Existing Environment,” Coastal Eng., 114, pp. 77–85. [CrossRef]
Singh, S. K., Raushan, P. K., and Debnath, K., 2018, “Turbulent Characteristics of Pulsating Flow Over Hydraulically Smooth Surface,” Eur. J. Mech. B Fluids, 68C, pp. 10–19. [CrossRef]
Singh, S. K., Debnath, K., and Mazumder, B. S., 2016, “Changes in Turbulent Flow Structure Over Rough-Bed Under Combined Wave-Current Motion,” ISH J. Hydraul. Eng., 22(3), pp. 305–313. [CrossRef]
Perry, A. E., Schofield, W. H., and Joubert, P. N., 1969, “Rough Wall Turbulent Boundary Layers,” J. Fluid Mech., 37, pp. 383–413. [CrossRef]
Nezu, I., and Rodi, W., 1986, “Open-Channel Measurements With a Laser Doppler Anemometer,” J. Hydraul. Eng., 112(5), pp. 335–355. [CrossRef]
Singh, S., Debnath, K., and Mazumder, B. S., 2015, “Turbulence Statistics of Wave-Current Flow Over a Submerged Cube,” J Waterway, Port, Coastal, Ocean Eng., 142, pp. 1–20.
Singh, S. K., and Debnath, K., 2017, “Turbulent Characteristics of Flow Under Combined Wave-Current Motion,” ASME J. Offshore Mech. Arctic Eng., 139(2), p. 021102. [CrossRef]
Nezu, I., and Nakagawa, H., 1993, Turbulence in Open-Channel Flows, A. A. Balkema, ed., CRC Press, Rotterdam, The Netherlands, Chap. 3.
Dean, R., 1978, “Reynolds Number Dependence of Skin Friction and Other Bulk Flow Variables in Two-Dimensional Rectangular Duct Flow,” ASME J. Fluids Eng., 100(2), pp. 215–223. [CrossRef]
Nezu, I., and Rodi, W., 1985, “Experimental Study on Secondary Currents in Open Channel Flow,” Proceedings of 21st IAHR Congress, Melbourne, Australia, 2, pp. 19–23.
Ranga Raju, K. G., Asawa, G. L., and Mishra, H. K., 2000, “Flow Establishment Length in Rectangular Channels and Duct,” J. Hydraul. Eng., 126(7), pp. 533–539. [CrossRef]
Sharma, A., and Kumar, B., 2017, “Boundary Layer Development Over Non-Uniform Sand Rough Bed Channel,” ISH J. Hydraul. Eng., 25, pp. 162–169. [CrossRef]
Wei, T., Schmidt, R., and McMurtry, P., 2005, “Comment on the Clauser Chart Method for Determining the Friction Velocity,” Exp. Fluids, 38, pp. 695–699. [CrossRef]
Cui, J., Patel, V. C., and Lin, C. L., 2003, “Large-Eddy Simulation of Turbulent Flow in a Channel With Rib Roughness,” Int. J. Heat Fluid Flow, 24, pp. 372–388. [CrossRef]
Tachie, M. F., Agelinchaab, M., and Shah, M. K., 2007, “Turbulent Flow Over Transverse Ribs in Open Channel With Converging Side Walls,” Int. J. Heat Fluid Flow, 28, pp. 683–707. [CrossRef]
Singh, S. K., Debnath, K., and Mazumder, B. S., 2017, “Turbulence Over Cube Mounted Rough Bed Using Spatiotemporal Averaging Approach,” Can. J. Civ. Eng., 44, pp. 504–517. [CrossRef]
Singh, S. K., Raushan, P. K., and Debnath, K., 2018, “Combined Effect of Wave and Current in Rough Bed Free Surface Flow,” Ocean Eng., 160, pp. 20–32. [CrossRef]
Raushan, P. K., Singh, S. K., and Debnath, K., 2018, “Grid Generated Turbulence Under the Rigid Boundary Influence,” J. Wind Eng. Ind. Aerod., 182, pp. 252–261. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

A photograph of fixed (25 mm high) transverse square rib roughness elements within the flume (L = 11 spacing). The wooden square ribs, which were first coated with water proof paint to avoid swelling and distortion under water, were placed at the flume bed.

Grahic Jump Location
Fig. 2

Bed roughness geometry notation along with measurement locations. The ribs have constant square cross section (roughness pitch P normalized with the roughness height k).

Grahic Jump Location
Fig. 3

(ac) The normalized streamwise, vertical turbulent intensities, and kinetic energy (Iu, Iw, and k^) profiles against z/h over the flat surface

Grahic Jump Location
Fig. 4

Normalized streamwise mean velocity profile over a train of 2D square rib with or without surface waves for the experiments run: (a) current only (f = 0 Hz), (b) f = 1 Hz, and (c) f = 2 Hz. Solid line represents the data for the flat surface at the developed zone. The flow evolution curve (dashed line) follows approximately the point of intersection of the profiles on the flat surface and the profiles over the rib roughness.

Grahic Jump Location
Fig. 5

Normalized streamwise mean velocity profile against z/h at locations A1–A8 along the centerline of the rib obstacle: (a) current-only flow (f = 0 Hz), (b) f = 1 Hz, and (c) f = 2 Hz (solid line represents the data for flat surface)

Grahic Jump Location
Fig. 6

Streamline plot of velocity vectors inside the cavity for the current-only and combined wave–current flows: (a) current-only flow (f = 0 Hz), (b) f =1 Hz, and (c) f = 2 Hz

Grahic Jump Location
Fig. 7

Normalized bottom-normal mean velocity profile against z/h at locations A1–A8 along the centerline of the rib roughness: (a) current-only flow (f = 0 Hz), (b) f = 1 Hz, and (c) f = 2 Hz (solid line profile represents the data for flat surface)

Grahic Jump Location
Fig. 8

The spatially averaged streamwise mean velocity profiles over rib roughness in inner coordinates along with the profile over the surface without rib roughness

Grahic Jump Location
Fig. 9

Normalized streamwise turbulence intensity against z/h at locations A1–A8 along the centerline of the rib obstacle: (a) current-only flow (f = 0 Hz), (b) f = 1 Hz, and (c) f = 2 Hz (solid line profile represents the data for the flat surface case)

Grahic Jump Location
Fig. 10

Normalized bottom-normal turbulence intensity profile against z/h at locations A1–A8 along the centerline of the rib obstacle: (a) current-only case (f = 0 Hz), (b) f = 1 Hz, and (c) f = 2 Hz (solid line profile represents the data for the flat surface case)

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In