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

Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

110
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.
110
Design Example: Flow Through a Fire Extinguisher01:12

Design Example: Flow Through a Fire Extinguisher

109
A fire extinguisher that uses pressurized water relies on fluid dynamics principles to generate a high-velocity stream capable of suppressing flames. The water is stored at a much higher pressure inside the extinguisher than the surrounding atmosphere. This pressure difference forces the water to flow rapidly when the extinguisher is activated, and the behavior of the water as it exits the nozzle can be understood using fundamental equations of fluid dynamics.
The key to understanding how the...
109
Hydraulic Jump01:29

Hydraulic Jump

32
A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
32
Shock Waves01:16

Shock Waves

2.0K
While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
When the source's speed approaches the speed of sound, constructive interference between successive wavefronts emitted by the source occurs immediately behind it. Initially, scientists believed that this constructive interference would result in such high...
2.0K
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

1.6K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
1.6K
Typical Model Studies01:30

Typical Model Studies

200
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.
200

You might also read

Related Articles

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

Sort by
Same author

Bridging Science Across Species: A Biomechanics Outreach Event at the Zoo.

Integrative organismal biology (Oxford, England)·2026
Same author

Gait transitions in load-pulling quadrupeds: insights from sled dogs and a minimal spring-loaded inverted pendulum model.

Journal of the Royal Society, Interface·2026
Same author

A centrin-Sfi1 myoneme fishnet powers ultrafast calcium-triggered contraction in the giant ciliate <i>Spirostomum ambiguum</i>.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Controlling noisy herds: Temporal network restructuring improves control of indecisive collectives.

Science advances·2026
Same author

Light-induced assembly and repeatable actuation in Ca<sup>2+</sup>-driven chemomechanical protein networks.

Nature communications·2026
Same author

Springtail-inspired compliant hinge enables terrain-adaptable takeoff in insect-scale robots.

bioRxiv : the preprint server for biology·2026
Same journal

Equity considerations in COVID-19 vaccine allocation modelling: a methodological study.

Interface focus·2025
Same journal

Ethical considerations in infectious disease modelling for public health policy: the case of school closures.

Interface focus·2025
Same journal

Why population heterogeneity matters for modelling infectious diseases.

Interface focus·2025
Same journal

Improving modelling for epidemic response: a progress update from a community of UK infectious disease modellers.

Interface focus·2025
Same journal

Optimization of school closures during an Omicron epidemic in Hong Kong: a modelling study.

Interface focus·2025
Same journal

Impact of opinion dynamics on recurrent pandemic waves: balancing risk aversion and peer pressure.

Interface focus·2025
See all related articles

Related Experiment Video

Updated: May 21, 2025

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
08:49

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

Published on: February 17, 2019

6.4K

Mastering the Manu-how humans create large splashes.

Pankaj Rohilla1, Daehyun Choi1, Halley Wallace1

  • 1Department of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, USA.

Interface Focus
|May 19, 2025
PubMed
Summary
This summary is machine-generated.

Manu jumping fluid dynamics can be optimized for larger splashes. A 45° V-angle and precise body opening timing create ideal Worthington jets, enhancing splash size.

Keywords:
Worthington jetsfluid dynamicswater entry

More Related Videos

Visualization of High Speed Liquid Jet Impaction on a Moving Surface
08:34

Visualization of High Speed Liquid Jet Impaction on a Moving Surface

Published on: April 17, 2015

11.4K
Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
10:09

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

12.2K

Related Experiment Videos

Last Updated: May 21, 2025

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
08:49

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

Published on: February 17, 2019

6.4K
Visualization of High Speed Liquid Jet Impaction on a Moving Surface
08:34

Visualization of High Speed Liquid Jet Impaction on a Moving Surface

Published on: April 17, 2015

11.4K
Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
10:09

Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids

Published on: March 5, 2014

12.2K

Area of Science:

  • Fluid dynamics
  • Biomechanics
  • Acoustics

Background:

  • Manu jumping is a traditional Māori diving style focused on splash creation.
  • Understanding the fluid dynamics of water entry is key to optimizing splash size.

Purpose of the Study:

  • To investigate the fluid dynamics of Manu jumping.
  • To identify key parameters for enhancing splash size and Worthington jet formation.

Main Methods:

  • Experimental study of water entry using passive objects and an active robot (Manubot).
  • Analysis of V-angle and body opening timing effects on cavity dynamics and jet formation.

Main Results:

  • A 45° V-angle was found to optimize Worthington jet formation.
  • Synchronized body opening within a specific timing window maximized jet strength and verticality.

Conclusions:

  • The study provides parameters for generating larger Manu splashes.
  • Insights offer engineering strategies for modulating underwater cavity dynamics through body formation.