Current Science

Open Access Open Access  Restricted Access Subscription Access

Characterization of Eddy Scales Over Tandem Obstacles for Surface Wave-Dominated Flow


Affiliations
1 Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Paschim Medinipur 721 102, India
2 Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur 711 103, India
 

The present experimental study was performed to explain the effects of the couple interaction between wave and current over a pair of hemispheres. Probability density function for the velocity fluctuation was analysed to explore the response of a surface wave on the following current. The external forcing effects of the hemisphere and superimposed surface waves within the main flow field are capable of modulating the entire range of turbulent eddy scales, and have an essential role in the modulation of the distribution of different eddy scales in the frequency domain.

Keywords

Bursting Event, Eddy Scales, Probability Density Function, Surface Waves, Wavelet Analysis.
User
Notifications
Font Size

  • Ferrier, G. A. and Carpenter, R. C., Sub-tidal benthic heterogeneity: flow environment modification and impacts on marine algal community structure and morphology. Biol. Bull., 2009, 217, 115–129.

  • Van Hoften, J. D. A. and Karaki, S., Interaction of waves and a turbulent current. In Proceedings of the 15th International Conference on Coast Engineering, ASCE, New York, 1976.

  • Kemp, P. H. and Simons, R. R., The interaction of waves and a turbulent current: waves propagating with the current. J. Fluid Mech., 1982, 116, 227–250.

  • Umeyama, M., Reynolds stresses and velocity distributions in a wave–current coexisting environment. J Waterw. Port, Coastal Ocean Eng., 2005, 131(5), 203–212.

  • Nikora, V. I., Goring, D. G. and Biggs, B. J. F., Some observation of the effects of micro-organisms growing on the bed of an open channel on the turbulence properties. J. Fluid Mech., 2002, 450, 317–341.

  • Agelinchaab, M. and Tachie, M. F., Open channel turbulent flow over hemispherical ribs. J. Heat Fluid Flow, 2006, 27, 1010–1027.

  • Farge, M., Wavelet transforms and their applications to turbulence. Annu. Rev. Fluid Mech., 1992, 24, 395–457.

  • Szilagyia, J., Parlangeb, M. B., Katul, G. G. and Albertson, J. D., An objective method for determining principal time scales of coherent eddy structures using orthonormal wavelets. Adv. Water Resour., 1999, 22(6), 561–566.

  • Niu, J. and Sivakumar, B., Scale-dependent synthetic stream flow generation using a continuous wavelet transform. J. Hydrol., 2013, 496, 71–78.

  • Wang, H., Lee, S., Hassan, Y. A. and Ruggles, A. E., LaserDoppler measurements of the turbulent mixing of two rectangular water jets impinging on a stationary pool. Int. J. Heat Mass Transf., 2016, 92, 206–227.

  • Barman, K., Debnath, K. and Mazumder, B. S., Turbulence between two inline hemispherical obstacles under wave–current interactions. Adv. Water Resour., 2016, 88, 32–52.

  • Barman, K., Debnath, K. and Mazumder, B. S., Higher-order turbulence statistics of wave–current flow over a submerged hemisphere. Fluid Dyn. Res., 2017, 49, 025504.

  • Roy, S., Samantaray, S. S. and Debnath, K., Study of turbulent eddies for wave against current. Ocean Eng., 2018, 150, 176–193.

  • Nezu, I. and Rodi, W., Open-channel measurement with a laser Doppler anemometer. J. Hydraul. Eng., 1986, 112(5), 335–355.

  • Nezu, I. and Nakagawa, H., Turbulence in Open-Channel Flows (ed. Balkema, A. A.), CRC Press, Rotterdam, The Netherlands, 1993.

  • Pokrajac, D. and Manes, C., Components of the spatially-averaged turbulent stress in open channel flows over rough beds. River Flow, Dittrich, koll, Aberle and Geisenhainer, 2010.

  • Czernuszenko, W. and Rowinski, P. M., Shear stress statistics in a compound channel flow. Arch. Hydro-Eng. Environ. Mech., 2008, 55(1–2), 3–27.

  • Li, H. and Nozaki, T., Wavelet analysis for the plane turbulent jet. JSME Int. J. Ser. B, 1995, 38(4), 525–531.


Abstract Views: 278

PDF Views: 86




  • Characterization of Eddy Scales Over Tandem Obstacles for Surface Wave-Dominated Flow

Abstract Views: 278  |  PDF Views: 86

Authors

Krishnendu Barman
Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Paschim Medinipur 721 102, India
Sayahnya Roy
Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur 711 103, India
Koustuv Debnath
Department of Aerospace Engineering and Applied Mechanics, Indian Institute of Engineering Science and Technology, Shibpur 711 103, India

Abstract


The present experimental study was performed to explain the effects of the couple interaction between wave and current over a pair of hemispheres. Probability density function for the velocity fluctuation was analysed to explore the response of a surface wave on the following current. The external forcing effects of the hemisphere and superimposed surface waves within the main flow field are capable of modulating the entire range of turbulent eddy scales, and have an essential role in the modulation of the distribution of different eddy scales in the frequency domain.

Keywords


Bursting Event, Eddy Scales, Probability Density Function, Surface Waves, Wavelet Analysis.

References





DOI: https://doi.org/10.18520/cs%2Fv118%2Fi12%2F1922-1929