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Related Concept Videos

Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

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Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
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General External Flow Characteristics01:26

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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Uniform Depth Channel Flow: Problem Solving01:18

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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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In pipe flow measurement, orifice, nozzle, and Venturi meters are commonly used to determine fluid flowrates by constricting the flow area, which increases fluid velocity and reduces pressure. This pressure difference, governed by Bernoulli's principle and adjusted for real-world conditions, is essential for calculating flowrate. Each meter type is suited to specific applications based on accuracy, efficiency, and compatibility with various flow conditions.
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Boundary Layer Characteristics01:18

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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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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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Related Experiment Video

Updated: Dec 31, 2025

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Atmospheric blocking and intercomparison of objective detection methods: flow field characteristics.

M C Pinheiro1, P A Ullrich1,2, R Grotjahn1

  • 11Department of Land, Air, and Water Resources, University of California, Davis, 1 Shields Ave, Davis, CA USA.

Climate Dynamics
|January 14, 2020
PubMed
Summary

Different algorithms for detecting atmospheric blocking show varying results. Understanding these differences is crucial for accurate extreme weather event analysis and future climate studies.

Keywords:
BlockingClimate variabilityClimatologyObjective detection

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Related Experiment Videos

Last Updated: Dec 31, 2025

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Area of Science:

  • Atmospheric Science
  • Climatology
  • Meteorology

Background:

  • Objective methods for identifying atmospheric blocking have proliferated, mainly focusing on the North Atlantic.
  • Discrepancies among these methods lead to variations in blocking climatology.

Purpose of the Study:

  • To compare blocking properties derived from three distinct objective detection algorithms globally.
  • To analyze differences in blocking climatologies, instantaneous patterns, size, speed, duration, and travel distance.

Main Methods:

  • Examined blocking using 500 hPa geopotential height anomaly (Δ500), column-averaged potential vorticity anomaly (ΔPV), and 500 hPa geopotential height gradient (AGP).
  • Analyzed results for blocking climatologies, instantaneous patterns, and distributions of block characteristics across global extratropics.

Main Results:

  • Δ500 and ΔPV methods showed higher spatial similarity in detected blocking regions.
  • Δ500 identified the largest and most numerous blocked regions, while ΔPV-detected regions were generally smallest.
  • All algorithms detected some questionable low-latitude blocks; Δ500 sometimes tracked jet streaks, differing from height-based methods.

Conclusions:

  • Algorithm choice significantly impacts blocking detection and characterization, influencing derived climatologies.
  • Careful consideration of algorithm biases is essential for future blocking research and linking blocking to extreme weather.
  • Methodological differences necessitate caution when interpreting blocking events and their impacts.