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Image processing techniques for velocity estimation in highly aerated flows: Bubble Image Velocimetry vs. Optical Flow
Bung, Daniel B.; Valero Huerta, Daniel
2016In Erpicum, Sébastien; Dewals, Benjamin; Archambeau, Pierre et al. (Eds.) Sustainable Hydraulics in the Era of Global Change
Peer reviewed
 

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Abstract :
[en] Measuring of flow velocities in aerated flows is known to be difficult in physical models. Application of classical anemometers or ADV probes is limited to low air concentration. Thus, highly aerated flows are commonly investigated by use of intrusive needle probes (conductivity or optical fiber) which allow determination of both, air concentration and velocity, as well as related parameters (e.g. bubble chord lengths and turbulence). In the recent past, non-intrusive image processing techniques have gained more attraction. In the present paper, Bubble Image Velocimetry and Optical Flow methods are applied to aerated stepped spillway flows using high-speed cameras with different resolution to highlight capabilities and limitations of both methods. Results show that Optical Flow is capable to give results of at least the same accuracy as Bubble Image Velocimetry. A higher image resolution enhances the quality of the results. The dense velocity information being obtained by Optical Flow may help to carry out investigations on turbulence in future.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Civil engineering
Author, co-author :
Bung, Daniel B.
Valero Huerta, Daniel ;  Université de Liège - ULiège > Form. doct. sc. ingé. & techn. (archi., gén. civ. - paysage)
Language :
English
Title :
Image processing techniques for velocity estimation in highly aerated flows: Bubble Image Velocimetry vs. Optical Flow
Publication date :
July 2016
Event name :
4th IAHR Europe Congress
Event organizer :
University of Liège
Event place :
Liège, Belgium
Event date :
from 27-7-2016 to 29-7-2016
Audience :
International
Main work title :
Sustainable Hydraulics in the Era of Global Change
Author, co-author :
Erpicum, Sébastien  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Dewals, Benjamin  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Archambeau, Pierre  ;  Université de Liège - ULiège > Urban and Environmental Engineering
Pirotton, Michel ;  Université de Liège - ULiège > Urban and Environmental Engineering
Publisher :
Taylor & Francis Group, London, United Kingdom
ISBN/EAN :
978-1-138-02977-4
Pages :
151-157
Peer reviewed :
Peer reviewed
Available on ORBi :
since 20 June 2017

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