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Related Concept Videos

Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Rapidly Varying Flow01:24

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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Turbulent Flow01:24

Turbulent Flow

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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent...
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Velocity and Acceleration of a Wave00:51

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A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
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Propagation Speed of Electromagnetic Waves01:30

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Related Experiment Video

Updated: Aug 1, 2025

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
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Wave dispersion in moderate channel turbulence.

Chiara Pilloton1, Claudio Lugni1,2,3, Giorgio Graziani4

  • 1CNR-INM, Institute of Marine Engineering, Via di Vallerano 139, 00128, Roma, Italy.

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Channel turbulence exhibits ocean-wave-like properties. Turbulent fluctuations behave dispersively as gravity-capillary waves, especially near walls, challenging traditional turbulence models.

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Area of Science:

  • Fluid Dynamics
  • Turbulence Theory
  • Wave Phenomena

Background:

  • Traditional turbulence models often assume "frozen eddies," where turbulent structures remain unchanged as they move.
  • This assumption, known as Taylor's hypothesis, breaks down in non-weak turbulence.
  • Understanding the dynamic evolution of turbulent structures is crucial for accurate flow prediction.

Purpose of the Study:

  • To investigate the wave-like properties of turbulent vorticity.
  • To apply stochastic methods from oceanic field analysis to channel turbulence.
  • To explore the breakdown of Taylor's hypothesis in turbulent flows.

Main Methods:

  • Interpreting turbulent vorticity as analogous to ocean wave packets.
  • Utilizing stochastic methods for analyzing oceanic fields.
  • Analyzing turbulent flow data at a bulk Reynolds number (Re b ) of 5600.

Main Results:

  • Vortical packets in channel turbulence exhibit ocean-like behavior.
  • Turbulent structures change shape and speed as they are advected, indicating wave dispersion.
  • Turbulent fluctuations display dispersive characteristics similar to gravity-capillary waves.

Conclusions:

  • Turbulence possesses inherent dispersive properties, akin to wave phenomena.
  • Capillarity plays a dominant role in the dispersive behavior of turbulence near wall regions.
  • The findings suggest a paradigm shift in understanding turbulence beyond the "frozen eddy" concept.