Experimental Analysis of Horizontal Turbulence of Flow over Flat and Deformed Beds

• Autorzy: Termini D.

Identyfikatory

DOI

10.1515/heem-2015-0021

• Języki publikacji: EN

Abstrakty

EN

Laboratory experiments in a straight flume were carried out to examine the evolution of large-scale horizontal turbulent structures under flat-bed and deformed-bed conditions. In this paper, the horizontal turbulence of flow under these conditions is analyzed and compared. The conditioned quadrant method is applied to verify the occurrence of turbulent events. The distributions of horizontal Reynolds shear stress and turbulent kinetic energy are also presented and discussed. Results show the occurrence of an “initial” sequence of horizontal vortices whose average spatial length scales with the channel width. Under deformed-bed conditions, this spatial length does not change.

Słowa kluczowe

EN

open-channel flow; flow turbulence structure; burst cycle; bed forms; laboratory experiments

• Wydawca: Institute of Hydro-Engineering of Polish Academy of Sciences
• Czasopismo: Archives of Hydro-Engineering and Environmental Mechanics
• Rocznik: 2015
• Tom: Vol. 62, nr 3-4
• Strony: 77--99
• Opis fizyczny: Bibliogr. 50 poz., rys.

Twórcy

autor

Termini D.

• Dipartimento di Ingegneria Civile, Ambientale, Aerospaziale, dei Materiali, University of Palermo; Viale delle Scienze, 90128 Palermo, Italy

Bibliografia

• Adrian R. J., Marusic I. (2012) Coherent structures in flow over hydraulic engineering surfaces, J. Hydr. Res., 50 (5), 451–464.
• Albayrak I. (2008) An experimental study of coherent structures, secondary currents and surface boils and their interrelation in open-channel flow, Ph.D. Thesis, École Polytechnique FÃddÃdrale de Lausanne, no. 4112: 281 doi: 10. 5075/epflthesis-4112.
• ASCE Task Committee on Flow and Sediment Transport over Dunes (2002) Flow and Transport over Dunes, J. Hydr. Div, 92 (HY3), 51–64.
• Balakumar B. J., Adrian R. J. (2007) Large-and very-large-scale motions in channel and boundary-layer flows, Philos. Trans. R- Soc. Lond. A, 365, 665–681.
• Bennet S. J., Best J. L. (1995) Mean flow and turbulence structure over fixed, two-dimensional dunes: Implication for transport and dune stability, Sedimentology, 42, 491–513.
• Bennet S. J., Bridge J. S., Best J. L. (1997) Fluid and sediment dynamics of upper stage plane beds,. J. Geoph. Res., 103 (C1), 1239–1274.
• Cantwell B. J. (1981) Organized Motion in Turbulent Flow, Ann. Review Fluid Mechanics, 13, 457–515.
• Carollo G., Ferro V., Termini D. (2005) Analyzing turbulence in gravel bed channels, J. Hydr. Eng., 131 (12), 1050–1061.
• Cellino M., Lemmin U. (2004) Influence of coherent flow structures on the dynamics of suspended sediment transport in open-channel flow, J. Hydr. Eng., 130 (11), 1077–1088.
• Cellino M., Graf W. H. (1999) Sediment-laden flow in open-channels under noncapacity and capacity conditions, J. Hydr. Eng., 125 (3), 455–462.
• Colombini M., Seminara G., Tubino M. (1987), Finite-amplitude alternate bars, J. Fluid Mechanics, 181, 213–232.
• Da Silva A. M. F. (2006) On why and how river meander, J. Hydr. Res., 44 (5), 579–590.
• Garcìa M. H., Nino Y., Lopez F. (1996) Laboratory observations of particle entrainment into suspension by turbulent bursting, in coherent flow structures in open channels, edited by P. J. Ashworth, S. J. Bennett, J. L. Best and S. J. McLelland, Wiley, Chichester, chap. 3, 63–68.
• Grass A. J. (1971) Structural Features of Turbulent Flow Over Smooth and Rough Boundaries, J. Fluid Mechanics, 50 (2), 233–255.
• Holmes R. R., Garcìa M. (2008) Flow over bedforms in a large sand-bed river: A Field investigation, J. Hydr. Res., 46 (3), 322–333.
• Hosoda T., Sakurai T., Muramoto Y. (1999) 3-D computation of unsteady flows in compound open channels with horizontal vortices and secondary currents, J. Hydroscience and Hydraulic Engineering JSCE, 17 (2), 87–96.
• Kanani A., Ahmari H., Ferreira da Silva A. M. (2010) Investigation of horizontal coherent structures in a shallow open-channel flow using velocity signal decomposition, Riverflow 2010-, Germany, 1059–1066.
• Lewalle J., Delville J., Bonnet J. P. (2000) Decomposition of mixing layer turbulence into coherent structures and background fluctuations, Flow, Turbulence and Combustion, 64, 301–328.
• Lu S. S., Willmarth W. W. (1973) Measurements of the Reynolds stress in a turbulent layer, J. Fluid Mechanics, 60 (3), 481–511.
• Lyn D. A. (1993) Turbulence measurements in open-channel Flows over artificial bed forms, J. Hydr. Res., 119 (3), 306–326.
• Mazumder B. S., Palm D. K., Ghoshal K., Ojha S. (2009) Turbulence statistics of flow over isolated scalene and isosceles, J. Hydr. Res., 47 (5), 626–637.
• Nadaoka K., Yagi H. (1998) Shallow-water turbulence modeling and horizontal large eddy computation of river flow, J. Hydr. Eng. ASCE, 124 (5), 493–500.
• Nakagawa H., Nezu I. (1981) Structure of space-time correlations of bursting phenomena in an open-channel flow, J. Fluid Mechanics, 104, 1–43.
• Nelson J. M., Shreve R. L., Mclean S., Drake T. G. (1995) Role of near-bed turbulence structure in bed load transport and bed form mechanics, Water Res. Res., 31 (8), 2071–2086.
• Nezu I., Nakagawa H. (1993) Turbulence on open channel flows, A. A. Balkema Publishers, Rotterdam, the Netherlands.
• Nezu I., Nakayama T. (1997) Space-time correlation structures of horizontal coherent vortices in compound open-channel flows by using particle-tracking velocimetry, J. Hydr. Res., 35 (2), 191–208.
• Nezu I., Onitsuka K., Iketani K. (1999) Coherent horizontal vortices in unsteady depth-varying open-channel flows. Hydraulic Modeling (ed. Singh et al), Water Res. Pub. Colorado, 17–32.
• Nezu I., Onitsuka K. (2002) Turbulent structures in partly vegetated open-channel flows with LDA and PIV measurements, J. Hydr. Res., 39 (6), 629–642.
• Nezu I., Rodi W. (1986) Open-channel flow measurements with a laser Doppler anemometer, J. Hydr. Eng., 123 (5), 335–355.
• Nezu I., Sanjou M., Goto K. (2003) Coherent horizontal vortices in unsteady depth-varying compound open-channel flows, XXX IAHR Congress, Vol. 1, Thessaloniki, 57–64.
• Nikora V. I., Goring G. (1999) On the relationship between Kolmogorov’s and generalized structure functions in the inertial subrange of developed turbulence, J. Phys. Math. Gen., 32, 4963–4969.
• Nikora V. I., Smart G. M. (1997) Turbulence characteristics of New-Zealand gravel-bed rivers, J. Hydr. Eng., 120 (8), 764–773.
• Pope S. B. (2000) Turbulent flows, Cambridge University Press.
• Robinson S. K. (1991) Coherent motions in the turbulent layer, Ann. Review Fluid Mechanics, 23, 601–639.
• Rodrìguez J. F., Garcìa M. H. (2008) Laboratory measurements of 3-D flow patterns and turbulence in straight open channel with rough bed, J. Hydr. Res., 46 (4), 454–465.
• Sanjou M., Nezu I. (2009) Turbulence structure and coherent motion in meandering compound open-channel flows, J. Hydr. Res., 47 (5), 598–610.
• Shvidchenko A. B., Pender G. (2001). Macroturbulent structure of open-channel flow over gravel beds, Water Res. Res., 37 (3), 709–719.
• Steffler P., Rajaratnam N., Peterson A. W. (1985) LDA measurements in open channel, J. Hydr. Eng., 111 (1), 119–130.
• Sukhodolov A. N., Nikora V., Katolokiv V. M. (2011) Flow dynamics in alluvial channels: the legacy of Kirill V. Grishanin, J. Hydr. Res., 49 (3), 285–292.
• Tamai A., Asaeda T., Ikeda H. (1986) Study on generation of periodical large surface eddies in a composite channel flow, Water Res. Res., 22 (7), 1129–1138.
• Termini D. (2005) Experimental investigation on the horizontal turbulence and the bed deformation: preliminary results, Proceedings of International Symposium on Stochastic Hydraulics, IAHR Congress, 23–24 May, Nijmegen – The Netherlands.
• Termini D., Lo Re C. (2006) Analysis of the relation between the flow “horizontal” turbulence and the bed deformation, Proceedings of International Symposium on Sediment Dynamics and the Hydromorphology of Fluvial Systems, Dundee (Scotland) 3–7 July, 73–79.
• Termini D., Sammartano V. (2007) Analysis of the role of turbulent structure in bed-forms formation in a rectilinear flume, 32nd Congress of IAHR, “Harmonizing the Demands of Art and Nature in Hydraulics”, Venice, Italy, 1–6 July 2007.
• Termini D., Sammartano V. (2008) Experimental analysis of relation between coherent turbulent structures and bed-forms formation, Archives of Hydro-Engineering and Environmental Mechanics, 55 (3–4), 125–143.
• Termini D., SammartanoV. (2009) Experimental observation of horizontal coherent turbulent structures in a straight flume, Proceedings of River, Coastal and Estuarine Morphodynamics – RCEM 2009, 21–29 September, Santa Fe City, Argentina.
• Utami T., Ueno T. (1991) Experimental Study on the Compound Meandering Channel Flow Using Flow Visualization and Picture Processing, J. Hydroscience and Hydr. Eng., 9 (1), 1-10.
• White B. L., Nepf H. M. (2007) Shear instability and coherent structures in shallow flow adjacent to a porous layer, J. Fluid Mechanics, 593, 1–32.
• Yalin M. S. (1992) River Mechanics, Pergamon Press, London.
• Yalin M. S., Da Silva A. M. F. (2001) Fluvial Processes, IAHR Monograph, IAHR, Delft, The Netherlands.
• Yokosi S. (1967) The structure of river turbulence, Bull. Disaster Prevention Res. Inst., Kyoto Univ., 17 (2), No. 121, October.