Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Typical Model Studies01:30

Typical Model Studies

669
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.
669
Modeling and Similitude01:12

Modeling and Similitude

701
Scaled modeling is a fundamental technique in engineering, enabling the study of large and complex systems by creating smaller, manageable replicas that recreate critical characteristics of the original. In hydrology and civil infrastructure, for example, scaled models of dams help analyze water flow, turbulence, and pressure. This method allows for accurate predictions of real-world behavior within a controlled environment, significantly reducing the cost and time involved in full-scale...
701
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

847
Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
847

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Embodied behavioural complexity in a ciliated microorganism.

Nature communications·2026
Same author

Predicting mosquito flight behavior using Bayesian dynamical systems learning.

Science advances·2026
Same author

Is next generation sequencing for the diagnosis of rare diseases worth its cost? A user-based approach to valuation.

The European journal of health economics : HEPAC : health economics in prevention and care·2025
Same author

Patient preferences for EGFR mutation-targeted therapies in non-small cell lung cancer, with a focus on Exon 20 insertions.

Lung cancer (Amsterdam, Netherlands)·2025
Same author

Nonreciprocal field theory for decision-making in multi-agent control systems.

Nature communications·2025
Same author

Nonlinear memory in cell-division dynamics across species.

Proceedings of the National Academy of Sciences of the United States of America·2025

Related Experiment Video

Updated: Mar 15, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

9.2K

Hydrodynamic length-scale selection in microswimmer suspensions.

Sebastian Heidenreich1, Jörn Dunkel2, Sabine H L Klapp3

  • 1Department of Mathematical Modelling and Data Analysis, Physikalisch-Technische Bundesanstalt Braunschweig und Berlin, Abbestrasse 2-12, D-10587 Berlin, Germany.

Physical Review. E
|September 15, 2016
PubMed
Summary
This summary is machine-generated.

Active suspensions exhibit a characteristic vortex length scale, unlike typical turbulent flows. This study derives a theory predicting this scale from microswimmer interactions, explaining viscosity changes observed in experiments.

More Related Videos

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
22:38

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

13.9K
Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction
10:03

Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction

Published on: October 25, 2012

11.9K

Related Experiment Videos

Last Updated: Mar 15, 2026

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
11:51

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions

Published on: February 22, 2018

9.2K
Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers
22:38

Chemotactic Response of Marine Micro-Organisms to Micro-Scale Nutrient Layers

Published on: May 28, 2007

13.9K
Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction
10:03

Quantitative Locomotion Study of Freely Swimming Micro-organisms Using Laser Diffraction

Published on: October 25, 2012

11.9K

Area of Science:

  • Physics
  • Fluid Dynamics
  • Soft Matter Physics

Background:

  • Mesoscale turbulence in active suspensions shows a distinct vortex length scale, unlike scale-invariant high-Reynolds number flows.
  • This collective length-scale selection is observed in diverse systems like bacterial fluids and active colloids, but its physical origins are unclear.

Purpose of the Study:

  • To systematically derive an effective field theory for active suspensions.
  • To predict the typical vortex size in microswimmer suspensions.
  • To explain the origins of length-scale selection in active turbulence.

Main Methods:

  • Derivation of an effective fourth-order field theory from a generic microscopic model.
  • Application of a self-consistent closure condition to the field theory.
  • Comparison of simulation results with experimental data from Bacillus subtilis suspensions.

Main Results:

  • The derived theory predicts the typical vortex size in microswimmer suspensions.
  • The vortex length scale is determined by the interplay of local alignment, rotational diffusion, and hydrodynamic interactions.
  • The theory accurately reproduces vortex structures observed in simulations and experiments.

Conclusions:

  • The study provides a theoretical framework for understanding length-scale selection in active turbulence.
  • The model explains the competition between different physical forces driving vortex formation.
  • The approach successfully predicts experimentally observed effective viscosity changes for different microorganism types (pullers and pushers).