Combined effect of wave and current in rough bed free surface flow

Singh, Santosh Kumar; Raushan, Pankaj Kumar; Debnath, Koustuv

doi:10.1016/j.oceaneng.2018.04.055

Cited by 24 publications

(8 citation statements)

References 41 publications

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“…Waves can increase the sea surface roughness and enhance the wind stress, which in turn modulate the current field [17]. In addition, the bottom friction can also be changed by waves, while breaking waves, nonbreaking waves, and their induced Coriolis-Stokes force and Langmuir circulation all influence the dynamics of the upper-ocean layer [18][19][20][21]. Researchers have established a few wave-current coupled models to simulate the ocean dynamic processes and have actively explored the parameterization schemes of wave-current interactions [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Wave–Current Interactions on Storm Surges and Waves during Cold Air Outbreaks in the Northern East China Sea

Hou

2021

JMSE

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Storm surges and disastrous waves induced by cold air outbreaks, a type of severe weather system, often impact the coastal economic development. Using the Climate Forecast System Reanalysis wind product and the Coupled Ocean–Atmosphere–Wave–Sediment Transport model, we developed a coupled numerical model and applied it to examine the interaction between surface gravity waves and ocean currents during cold air outbreaks in two case studies in the northern East China Sea. The results revealed that wave–current interactions improved the simulation accuracy, especially the water level, as verified by tidal station measurements. We conducted sensitivity experiments to explore the spatiotemporal variation of the impact of wave–current interactions on storm surges and waves in the northern East China Sea, away from the coastline. The wave-induced surge (up to 0.4 m) and the wave-induced current (up to 0.5 m/s) were found to be related to the difference between wave direction and current direction. The significant wave height difference (up to 0.5 m) was sensitive to the storm surge nearshore and sensitive to the current field offshore, while the mean wave direction change (up to 40°) was more sensitive to the current field than to the storm surge. Additionally, the wave–current interaction regulated the momentum balance and wave action balance, respectively. By comparison, the momentum residuals of pressure gradient, Coriolis force, Coriolis–Stokes force, and bottom stress, which were pronounced in different areas, were modulated more significantly by the wave effect than other terms. The dominant mechanisms of wave–current interactions on waves included the current-induced modification of energy generation caused by wind input, the current-induced modification of energy dissipation caused by whitecapping, and the current-induced wave advection.

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Section: Introductionmentioning

confidence: 99%

Assessing the Impact of Wave–Current Interactions on Storm Surges and Waves during Cold Air Outbreaks in the Northern East China Sea

Hou

2021

JMSE

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“…The solid curved line follows approximately the point of intersection of the profiles on the plane-bed surface and the profiles over the cube mounted rough-bed surface. only likely to be 0.40 if there is sufficient scale separation between the inner and outer flows (Coleman et al 2007;Roussinova and Balachandar 2011;Heidari et al 2017;Singh et al 2018a) as in the study of Coleman et al (2007). However, for the intermediate roughness spacing case, this is very unlikely that can be different in such circumstances, even if a log-law is evident (e.g., Leonardi and Castro 2010) as in the authors' study.…”

mentioning

confidence: 74%

Reply to the discussion by Li and Li on “Turbulence over cube-mounted rough bed using spatiotemporal averaging approach”

Singh¹,

Debnath

Mazumder

2019

Can. J. Civ. Eng.

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“…65,66 Flows with diverse turbulence characteristics are usually produced using grids in experiments to understanding the suspension process of solid particles (different grain sizes such as nano and micro-meter sized particles) and the mechanisms of high-Schmidt-number mass transfer turbulent flow over a solid boundary because these processes involve many fundamental aspects of near-wall turbulence under the different fluid environments such as water, oil, ethylene glycol or air. 67–69 The present experimental results obtained from the grid-generated turbulence with the variation of mesh sizes can be useful to understand the different level of turbulence characteristics which will be useful for designing of the devices operating in free-stream turbulence. Understanding the turbulence levels generated by grids of different size is also critical in aquaculture firms wherein desired turbulence levels need to be maintained because different species may have preferred turbulence levels for optimized nutrients uptake and growth (for e.g., fish larvae) in the aquaculture ecosystem.…”

Section: Discussionmentioning

confidence: 97%

Turbulence anisotropy with higher-order moments in flow through passive grid under rigid boundary influence

Raushan

Singh

Debnath

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The investigation presents the estimate of the degree of deviation from the isotropic turbulence in terms of Reynolds stress tensor for grid generated turbulence under the influence of bottom boundary. The turbulence triangle, Eigen values, and the invariant functions are presented at near and far field regions of the grids with different solidity ratio. In addition, the work also deals with the analysis based on third-order moments of the velocity fluctuations and the ratio of momentum flux to the turbulent kinetic energy in the frequency domain. The Reynolds stress anisotropy exposes that the anisotropic invariant maps possess a closed looping trend in the near field region and an open looping trend in the far-field region of the grid. Further, to describe the physical behaviour of the velocity time-series of random fluctuating components in the stream-wise directions, the probability distribution function are estimated and interpreted.

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Combined effect of wave and current in rough bed free surface flow

Cited by 24 publications

References 41 publications

Assessing the Impact of Wave–Current Interactions on Storm Surges and Waves during Cold Air Outbreaks in the Northern East China Sea

Assessing the Impact of Wave–Current Interactions on Storm Surges and Waves during Cold Air Outbreaks in the Northern East China Sea

Reply to the discussion by Li and Li on “Turbulence over cube-mounted rough bed using spatiotemporal averaging approach”

Turbulence anisotropy with higher-order moments in flow through passive grid under rigid boundary influence

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