NDLI: Turbulence characteristics of open channel flow over non-equilibrium 3-D mobile dunes

Please wait, while we are loading the content...

Dynamic cellular manufacturing system design considering alternative routing and part operation tradeoff using simulated annealing based genetic algorithm

Structural damage detection using ARMAX time series models and cepstral distances

Solution to the Riemann problem for a five-equation model of multiphase flows in non-conservative form

Sadhana : Volume 41, Issue 8, August 2016

Sadhana : Volume 41, Issue 7, July 2016

Sadhana : Volume 41, Issue 6, June 2016

Sadhana : Volume 41, Issue 5, May 2016

Sadhana : Volume 41, Issue 4, April 2016

Sadhana : Volume 41, Issue 3, March 2016

Sadhana : Volume 41, Issue 2, February 2016

Sadhana : Volume 41, Issue 1, January 2016

Turbulence characteristics of open channel flow over non-equilibrium 3-D mobile dunes

Content Provider	Springer Nature Link
Author	Hanmaiahgari, Prashanth Reddy Balachandar, Ram
Copyright Year	2016
Abstract	This paper reports velocity measurements over mobile dunes using an acoustic Doppler velocimetry (ADV). Experiments were conducted with two different flow conditions resulting in the formation of two different size mobile dunes. Dunes height, wavelength and velocity of dunes found to be increasing with increase in average flow velocity for a constant flow depth. The quasi-stationary bed condition was assumed while measuring the velocity distribution along the depth. The effect of the non-equilibrium mobile dunes on the flow characteristics and turbulence is examined by computing turbulent intensities, turbulent kinetic energy and Reynolds shear stresses using time averaged and time–space averaged velocity measurements. The magnitudes of transverse velocities are approximately 1/10 of streamwise velocities and vertical velocities are approximately half of the transverse velocities. The considerable magnitudes of transverse velocities over mobile bedforms necessitate measurement of 3-D velocity components to analyze the flow field. Computed turbulence intensities are found to be maximum in the region consisting of the trough and the reattachment point of the dunes. It is observed that streamwise turbulence intensities near the bed are twice the transverse turbulence intensities, and transverse turbulence intensities are twice the vertical turbulence intensities. Reynolds stresses (transverse fluxes of streamwise and vertical momentum) are observed to be high on mobile bedforms which shows mobile dunes reinforce the secondary currents. Peak values of turbulent kinetic energy (TKE) and Reynolds stresses are also found in the region consisting of the trough and the reattachment point. It is visually observed in the present experiments that maximum erosion takes place at the reattachment point and eroded sediment is carried as total load and dropped on the lee slope of the subsequent downstream dune. This phenomenon is caused by flow expansion in the separation zone, and which is also the main reason for mobility of dunes and associated bedload transport. Most importantly, it is found that turbulence anisotropy increases with increase in size of mobile bedforms and anisotropy is extended up to the free surface in the flows over mobile bedforms, which proves the entire depth of flow is being disturbed by the mobile dunes.
Starting Page	1019
Ending Page	1037
Page Count	19
File Format	PDF
ISSN	02562499
Journal	Sadhana
Volume Number	41
Issue Number	9
e-ISSN	09737677
Language	English
Publisher	Springer India
Publisher Date	2016-09-03
Publisher Place	New Delhi
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mobile bedforms sediment transport turbulence bed shear stress open channel flow ADV Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Mean flow characteristics, vertical structures and bed shear stress at open channel bifurcation

Flow resistance in a compound gravel-bed bend

Sediment transport and bedforms: a numerical study of two-phase viscous shear flow

Experimental studies of local scour in the pressurized OCF below a wooden log across the flow

Study on bed load transport for uniform sediment in laminar flow

Hydrodynamics of Mobile Sand-Bed and Immobile Gravel-Bed

Influence of Vegetation on Turbulence Characteristics and Reynolds Shear Stress in Partly Vegetated Channel

Nonlinear mechanism of bed load transport

Near bed turbulence measurement with acoustic doppler velocimeter (ADV)

Turbulence characteristics of open channel flow over non-equilibrium 3-D mobile dunes

Similar Documents

Mean flow characteristics, vertical structures and bed shear stress at open channel bifurcation

Flow resistance in a compound gravel-bed bend

Sediment transport and bedforms: a numerical study of two-phase viscous shear flow

Experimental studies of local scour in the pressurized OCF below a wooden log across the flow

Study on bed load transport for uniform sediment in laminar flow

Hydrodynamics of Mobile Sand-Bed and Immobile Gravel-Bed

Influence of Vegetation on Turbulence Characteristics and Reynolds Shear Stress in Partly Vegetated Channel

Nonlinear mechanism of bed load transport

Near bed turbulence measurement with acoustic doppler velocimeter (ADV)

Turbulence characteristics of open channel flow over non-equilibrium 3-D mobile dunes