Articles with "channel flows" as a keyword



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SPH modelling of depth‐limited turbulent open channel flows over rough boundaries

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Published in 2017 at "International Journal for Numerical Methods in Fluids"

DOI: 10.1002/fld.4248

Abstract: Summary A numerical model based on the smoothed particle hydrodynamics method is developed to simulate depth‐limited turbulent open channel flows over hydraulically rough beds. The 2D Lagrangian form of the Navier–Stokes equations is solved, in… read more here.

Keywords: channel flows; limited turbulent; open channel; model ... See more keywords

Treatments of Micro-channel Flows Revisited: Continuum Versus Rarified Gas Considerations

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Published in 2020 at "Journal of The Institution of Engineers (India): Series C"

DOI: 10.1007/s40032-020-00586-3

Abstract: There are numerous treatments of micro-channel flows available that point out the breakdown of the Navier–Stokes equations under molecular flow conditions when continuum conditions should still apply. The wrong conclusion regarding the validity of the… read more here.

Keywords: rarified gas; channel flows; micro channel; treatments micro ... See more keywords
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The effect of cube-roughened walls on the response of rough-to-smooth (RTS) turbulent channel flows

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Published in 2018 at "International Journal of Heat and Fluid Flow"

DOI: 10.1016/j.ijheatfluidflow.2018.05.008

Abstract: Abstract Direct numerical simulations of cube-roughened rough-to-smooth channel flows are performed with the objective of studying the response of turbulence statistics in the developing flow over smooth walls. Non-equilibrium effects persist and the global recovery… read more here.

Keywords: effect cube; channel flows; response; cube roughened ... See more keywords
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Asymmetric reverse transition phenomenon in internal turbulent channel flows due to temperature gradients

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Published in 2021 at "International Journal of Thermal Sciences"

DOI: 10.1016/j.ijthermalsci.2020.106463

Abstract: Abstract Laminarization of a turbulent flow due to wall heating has been known for more than 50 years, to the point that it is sometimes used as means of reducing friction. However this phenomenon has… read more here.

Keywords: channel flows; reverse transition; temperature; moment ... See more keywords
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Consistent equations for open-channel flows in the smooth turbulent regime with shearing effects

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Published in 2017 at "Journal of Fluid Mechanics"

DOI: 10.1017/jfm.2017.626

Abstract: Consistent equations for turbulent open-channel flows on a smooth bottom are derived using a turbulence model of mixing length and an asymptotic expansion in two layers. A shallow-water scaling is used in an upper –… read more here.

Keywords: channel flows; open channel; flows smooth; consistent equations ... See more keywords
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The colour of forcing statistics in resolvent analyses of turbulent channel flows

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Published in 2020 at "Journal of Fluid Mechanics"

DOI: 10.1017/jfm.2020.802

Abstract: Abstract In resolvent analyses of turbulent channel flows it has been common practice to neglect or model the nonlinear forcing term that forms the input of the resolvent. However, the spatiotemporal structure of this term… read more here.

Keywords: channel flows; turbulent channel; channel; nonlinear forcing ... See more keywords
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Quantitative Characterization of Streaky Structures in Open-Channel Flows

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Published in 2017 at "Journal of Hydraulic Engineering"

DOI: 10.1061/(asce)hy.1943-7900.0001353

Abstract: AbstractStreaky structures have been reported in open-channel flows by various investigations in the inner and outer layer. Although the ubiquity of streaks is well recognized, it remains unclear h... read more here.

Keywords: channel flows; quantitative characterization; open channel; streaky structures ... See more keywords
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Scales of turbulence in open-channel flows with low relative submergence

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Published in 2019 at "Physics of Fluids"

DOI: 10.1063/1.5127562

Abstract: The present work aims at studying the turbulence structure developed over a highly rough bed in open-channel flows (OCFs) by varying the relative submergence through the use of three sediment sizes ranging from gravels to… read more here.

Keywords: channel flows; submergence; premultiplied spectra; time ... See more keywords
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Flow Resistance and Structures in Viscoelastic Channel Flows at Low Re.

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Published in 2019 at "Physical review letters"

DOI: 10.1103/physrevlett.123.194501

Abstract: The flow of viscoelastic fluids in channels and pipes remains poorly understood, particularly at low Reynolds numbers. Here, we investigate the flow of polymeric solutions in straight channels using pressure measurements and particle tracking. The… read more here.

Keywords: viscoelastic channel; structures viscoelastic; flow resistance; resistance structures ... See more keywords
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Analysis of Hydrodynamic Mechanism on Particles Focusing in Micro-Channel Flows

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Published in 2017 at "Micromachines"

DOI: 10.3390/mi8070197

Abstract: In this paper, the hydrodynamic mechanism of moving particles in laminar micro-channel flows was numerically investigated. A hydrodynamic criterion was proposed to determine whether particles in channel flows can form a focusing pattern or not.… read more here.

Keywords: hydrodynamic mechanism; particle; channel flows; micro channel ... See more keywords