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Related Concept Videos

Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the streamlines...
Propagation of Waves01:07

Propagation of Waves

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.
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Typical Model Studies01:30

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

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Uniform Depth Channel Flow: Problem Solving

To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Partial Differential Equations

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Related Experiment Video

Updated: Jul 23, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

Multiscale coherent structures and broadband waves due to parallel inhomogeneous flows

Gavrishchaka1, Ganguli, Scales

  • 1Science Applications International Corporation, McLean, Virginia.

Physical Review Letters
|November 4, 2000
PubMed
Summary

A spatial gradient in ion drift parallel to magnetic fields generates broadband waves. These waves create complex structures, ion energization, and transport, matching Fast Auroral Snapshot satellite observations.

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Related Experiment Videos

Last Updated: Jul 23, 2026

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section
11:00

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Published on: July 19, 2016

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Blood Flow Imaging with Ultrafast Doppler
05:57

Blood Flow Imaging with Ultrafast Doppler

Published on: October 14, 2020

Area of Science:

  • Plasma physics
  • Space physics
  • Astrophysics

Background:

  • Ion drift and magnetic fields are crucial in space plasma phenomena.
  • Understanding wave generation and particle interactions is key to explaining space weather events.

Purpose of the Study:

  • To investigate the generation of broadband waves from ion drift gradients.
  • To analyze the nonlinear consequences of these waves on plasma structures and particle behavior.
  • To compare simulation results with satellite observations.

Main Methods:

  • Linear theory analysis.
  • Particle-in-cell simulations.
  • Comparison with Fast Auroral Snapshot (FAST) satellite data.

Main Results:

  • A transverse gradient in ion drift (dV(di)/dx < Omega(i)) generates a broadband multimode spectrum (omega << Omega(i) to omega >> Omega(i)).
  • Nonlinear effects include multiscale coherent structures, significant cross-field transport, ion energization, and phase-space diffusion.
  • Large spikes observed in the parallel electric field time series.

Conclusions:

  • The study identifies a key mechanism for wave generation and plasma energization in magnetized plasmas.
  • Simulated signatures closely resemble Fast Auroral Snapshot satellite observations in upward current regions.
  • Findings contribute to understanding plasma dynamics in astrophysical and space environments.