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

Buoyancy and Stability for Submerged and Floating Bodies01:11

Buoyancy and Stability for Submerged and Floating Bodies

1.9K
In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
1.9K
Hydraulic Jump: Problem Solving01:16

Hydraulic Jump: Problem Solving

99
To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
99
Hydraulic Jump01:29

Hydraulic Jump

137
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...
137
Hydrostatic Pressure Force on a Curved Surface01:04

Hydrostatic Pressure Force on a Curved Surface

1.9K
Hydrostatic pressure on curved surfaces is a fundamental concept in fluid mechanics with broad applications in the civil engineering field. When fluid is in contact with a curved surface, as in a reservoir, dam, or storage tank, it exerts pressure that varies in magnitude and direction along the curved surface. To assess the total hydrostatic force exerted by the fluid on a curved structure, engineers typically isolate the fluid volume adjacent to the surface and analyze the forces acting on...
1.9K
Buoyancy00:59

Buoyancy

10.1K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
10.1K

You might also read

Related Articles

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

Sort by
Same author

Prenatal biliary imaging for the diagnosis of biliary atresia: a protocol for a multicentre prospective diagnostic accuracy study.

BMJ open·2026
Same author

Risk factors for recurrent abortion after induced abortion in Chinese women: a prospective study.

The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians·2026
Same author

Bio-Based Smart Packaging Materials for Next-Generation Food Systems.

Materials (Basel, Switzerland)·2026
Same author

Analysis of Erosive Wear in Pipe Elbows and Biomimetic Protection Strategies.

Biomimetics (Basel, Switzerland)·2026
Same author

Clinical characteristics and surgical treatment of congenital gluteal dermal sinus tract in children: a 15-year retrospective single-center clinical experience.

Frontiers in pediatrics·2026
Same author

3D interconnected periodic carbon-tube membrane enabled self-cleaning solar brine treatment and autonomous salt production.

National science review·2026

Related Experiment Video

Updated: Aug 6, 2025

A Robotic Platform to Study the Foreflipper of the California Sea Lion
08:53

A Robotic Platform to Study the Foreflipper of the California Sea Lion

Published on: January 10, 2017

8.0K

Dynamics and hydrodynamic efficiency of diving beetle while swimming.

Debo Qi1, Chengchun Zhang1,2,3, Zhengyang Wu1,2

  • 1Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun, 130025, China.

Heliyon
|March 16, 2023
PubMed
Summary
This summary is machine-generated.

Diving beetles propel efficiently using hind legs for forward and backward swimming. Optimizing leg swing speed is key for enhancing propulsion efficiency in bionic underwater vehicles.

Keywords:
Added mass forceDiving beetleDrag forceHydrodynamic efficiencyPropulsion force

More Related Videos

Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
07:17

Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor

Published on: August 3, 2018

6.1K
Swimming Performance Assessment in Fishes
05:12

Swimming Performance Assessment in Fishes

Published on: May 20, 2011

25.6K

Related Experiment Videos

Last Updated: Aug 6, 2025

A Robotic Platform to Study the Foreflipper of the California Sea Lion
08:53

A Robotic Platform to Study the Foreflipper of the California Sea Lion

Published on: January 10, 2017

8.0K
Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
07:17

Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor

Published on: August 3, 2018

6.1K
Swimming Performance Assessment in Fishes
05:12

Swimming Performance Assessment in Fishes

Published on: May 20, 2011

25.6K

Area of Science:

  • Biomimetics and Bio-inspired Engineering
  • Fluid Dynamics and Hydrodynamics
  • Robotics and Autonomous Systems

Background:

  • Diving beetles serve as a model for bionic underwater vehicles due to their agile locomotion.
  • Understanding their propulsion mechanics is crucial for developing advanced micro underwater vehicles.
  • Hind leg kinematics and dynamics dictate swimming performance and efficiency.

Purpose of the Study:

  • To analyze the kinematic and dynamic parameters of diving beetle swimming.
  • To evaluate the hydrodynamic efficiency of forward and backward swimming modes.
  • To provide insights for designing efficient bionic propulsion systems.

Main Methods:

  • Motion Capture Technology was used to analyze high-speed swimming videos.
  • Computational Fluid Dynamics (CFD) simulations were employed to study hydrodynamic forces.
  • Kinematic and dynamic parameters of hind leg movements were quantified.

Main Results:

  • Diving beetles exhibit high propulsion force and low return resistance in both swimming modes.
  • Forward swimming efficiency was 0.47, while backward swimming efficiency was 0.30.
  • Backward swimming allows for rapid acceleration for predator evasion, despite lower overall efficiency.

Conclusions:

  • The hind leg's propulsion cycle generates significant thrust and minimizes drag.
  • Backward swimming's efficiency is reduced by passive leg swings and increased drag during recovery.
  • Optimizing the timing and speed of hind leg movements is essential for maximizing propulsion efficiency in bionic designs.