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<p>An experimental study was carried out in a wave flume to investigate the structure of turbulence resulting from the interaction of waves with bottom-mounted submerged horizontal circular cylinder. Regular waves of three different frequencies (<i>f</i> = 0.6, 0.8 and 1.0&#xa0;Hz) were generated by a wave maker and three-dimensional (3D) micro-acoustic Doppler velocimeter (ADV) was used to measure the instantaneous velocity components generated by the wave and submerged horizontal cylinder interaction. Phase-averaged (PA) velocity, turbulence intensity, and Reynolds shear stress due to regular wave over the horizontal cylindrical obstacle are evaluated. Further turbulent dissipation through spectra, Taylor and Kolmogorov length scale, turbulent bursting is investigated to exhibit the physics of the fluid motion due to the interaction. Larger magnitudes of length scales are found close to the bed, demonstrating the presence of larger sized eddies in the wake region&#xa0;of cylinder. For all the frequencies, the results indicate that the sweep and ejection turbulent bursting events are the major contributors to the total Reynolds shear stress. In addition, the phase-averaged approach is applied to examine the anisotropic structure of turbulence caused by the superposition of waves in the presence of horizontal cylinders. Results indicate that at the bottom, the turbulence structure is highly anisotropic, and moving upward, the structure of turbulence evolves&#xa0;to the three-dimensional isotropic state.</p>

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Characterization of turbulence properties for the regular wave over a submerged circular cylinder

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Kapil Roy,
  • Krishnendu Barman,
  • Koustuv Debnath

摘要

An experimental study was carried out in a wave flume to investigate the structure of turbulence resulting from the interaction of waves with bottom-mounted submerged horizontal circular cylinder. Regular waves of three different frequencies (f = 0.6, 0.8 and 1.0 Hz) were generated by a wave maker and three-dimensional (3D) micro-acoustic Doppler velocimeter (ADV) was used to measure the instantaneous velocity components generated by the wave and submerged horizontal cylinder interaction. Phase-averaged (PA) velocity, turbulence intensity, and Reynolds shear stress due to regular wave over the horizontal cylindrical obstacle are evaluated. Further turbulent dissipation through spectra, Taylor and Kolmogorov length scale, turbulent bursting is investigated to exhibit the physics of the fluid motion due to the interaction. Larger magnitudes of length scales are found close to the bed, demonstrating the presence of larger sized eddies in the wake region of cylinder. For all the frequencies, the results indicate that the sweep and ejection turbulent bursting events are the major contributors to the total Reynolds shear stress. In addition, the phase-averaged approach is applied to examine the anisotropic structure of turbulence caused by the superposition of waves in the presence of horizontal cylinders. Results indicate that at the bottom, the turbulence structure is highly anisotropic, and moving upward, the structure of turbulence evolves to the three-dimensional isotropic state.