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Related Concept Videos

What is a Mode?01:07

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The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
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Updated: May 17, 2025

High-speed Particle Image Velocimetry Near Surfaces
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Full-domain POD modes from PIV asynchronous patches.

Iacopo Tirelli1, Adrian Grille Guerra2, Andrea Ianiro1

  • 1Department of Aerospace Engineering, Universidad Carlos III de Madrid, Avda. Universidad 30, 28911 Leganés, Madrid, Spain.

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|May 16, 2025
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Summary
This summary is machine-generated.

This study introduces Patch POD, a novel method for analyzing large-scale flow fields using non-simultaneous measurements. It enables full-domain spatial mode analysis from overlapping particle image velocimetry (PIV) data.

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Area of Science:

  • Fluid dynamics
  • Experimental fluid mechanics
  • Data analysis

Background:

  • Capturing large-scale flow organization from extensive domains with non-simultaneous measurements presents a significant challenge.
  • Traditional methods struggle to synthesize global flow characteristics from fragmented spatial data.

Purpose of the Study:

  • To develop a robust method for obtaining full-domain spatial modes from particle image velocimetry (PIV) data acquired at different, overlapping spatial locations.
  • To enable global modal analysis for large domains covered by multiple, non-simultaneous measurements.

Main Methods:

  • Proposed a technique, Patch POD, leveraging proper orthogonal decomposition (POD) on spatial correlation matrices derived from local, non-simultaneous PIV measurements.
  • Required 50-75% overlap between measurement regions for smooth mode distribution.
  • Applied to simulated PIV data of a submerged jet and experimental data from robotic measurements around a wall-mounted cube.

Main Results:

  • Patch POD successfully synthesizes full-domain spatial modes from fragmented measurements.
  • The method can identify flow structures twice the size of individual measurement patches.
  • Demonstrated effective global modal analysis in both simulated and experimental fluid flow scenarios.

Conclusions:

  • Patch POD provides a viable solution for large-domain flow analysis using non-simultaneous PIV data.
  • The technique enhances the capability to capture large-scale flow field organization.
  • Applicable to various experimental setups, including robotic measurements.