Related Experiment Video
Updated: Aug 27, 2025
08:19
Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
Published on: May 9, 2021
2.3K
A numerical simulation framework for bubbly flow and sound generation in laboratory-scale breaking waves.
Qiang Gao1, Lian Shen1, Grant B Deane2
1Department of Mechanical Engineering, St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, Minnesota 55455, USA.
JASA Express Letters
|September 26, 2022
Summary
This study presents a simulation framework for bubbly flow and breaking wave sounds. The model accurately predicts sound generation from bubble creation, highlighting air cylinder breakup as a key factor.
Area of Science:
- Fluid Dynamics
- Acoustics
- Computational Physics
Background:
- Breaking waves generate significant sound through bubble dynamics.
- Accurate simulation of bubbly flow is crucial for understanding radiated sound.
- Existing models often lack detailed bubble dynamics and sound generation mechanisms.
Purpose of the Study:
- To develop a comprehensive simulation framework for bubbly flow and sound radiation from breaking waves.
- To investigate the role of bubble creation and breakup in sound generation.
- To validate the simulation against laboratory observations.
Main Methods:
- Developed a two-phase flow solver.
- Implemented an algorithm for tracking bubbles and their creation rates.
- Integrated a module for computing sound generated by newly-formed bubbles.
- Calculated sound from breaking third-order Stokes waves with specific wavelengths and slopes.
Main Results:
- The simulation framework shows encouraging agreement with laboratory observations.
- Identified air cylinder breakup as a critical process in bubble creation.
- Successfully modeled sound generation from breaking waves.
Conclusions:
- The developed framework is a promising tool for simulating bubbly flow and breaking wave acoustics.
- Air cylinder breakup plays a vital role in the sound radiated by breaking waves.
- Further research is needed to model boundary effects and sound from air cylinder breakup.
More Related Videos
Related Concept Videos
01:09Deriving the Speed of Sound in a Liquid
574
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
The speed of sound in fluids can be derived by considering a mechanical wave...
574
01:30Typical Model Studies
426
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.
426
01:28Standing Waves in a Cavity
1.0K
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
1.0K
01:07Laminar and Turbulent Flow
9.0K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
9.0K
01:23Steady, Laminar Flow in Circular Tubes
322
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
322
01:17Accelerating Fluids
1.4K
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
1.4K