Turbulence characteristics of flow under combined wave-current motion

Santosh Kumar Singh*, Koustuv Debnath

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper describes an experimental study carried out in a laboratory flume with a smooth surface to investigate the effect of a surface wave on unidirectional current. The measured velocity data were analyzed within the framework of the phase averaging for combined wave-current flow and verified by velocity equations based on the phaseaveraged Prandtl momentum-transfer theory. The results highlight the changes induced on the mean velocity profile, turbulence intensity, and Reynolds shear stress in a plane of symmetry due to the superposition of surface waves of different frequencies. Modifications in the mean velocities, the turbulence intensities, and the Reynolds shear stresses with respect to the current-only flow are explored. As the frequency of the surface waves in unidirectional current changes, the results show variations in the mean flow and in the turbulence statistics that may affect the local sediment mobility in the coastal region.

Original languageEnglish
Article number021102
JournalJournal of Offshore Mechanics and Arctic Engineering
Issue number2
StatePublished - 1 Apr 2017
Externally publishedYes


  • Reynolds stress
  • Stress fraction
  • Turbulence
  • Wave-current interaction
  • Wave-maker


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