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A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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Laminar and Turbulent Flow01:07

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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...
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Turbulent Flow: Problem Solving01:09

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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Equation of Rotational Dynamics01:08

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Angular variables are introduced in rotational dynamics. Comparing the definitions of angular variables with the definitions of linear kinematic variables, it is seen that there is a mapping of the linear variables to the rotational ones. Linear displacement, velocity, and acceleration have their equivalents in rotational motion, which are angular displacement, angular velocity, and angular acceleration. Similar to the rotational variables, a mapping exists from Newton's second law of motion...
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Related Experiment Video

Updated: Sep 19, 2025

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

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Paradigm for global gyrokinetic turbulence.

J Candy1, A Dudkovskaia2, E A Belli1

  • 1General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA.

Physical Review. E
|June 19, 2025
PubMed
Summary

This study introduces a new method for global gyrokinetic simulations, enhancing precision without losing efficiency. It reveals two key global corrections: a radial shift and a decorrelation similar to E×B shear effects.

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Last Updated: Sep 19, 2025

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Area of Science:

  • Plasma Physics
  • Computational Physics

Background:

  • Local gyrokinetic equations are efficient but lack global accuracy.
  • Global simulations are computationally expensive and can be less accurate.

Purpose of the Study:

  • To develop a method for incorporating global profile curvature into local gyrokinetic equations.
  • To enable high-precision global gyrokinetic simulations efficiently.

Main Methods:

  • Utilizing a wave-number-advection algorithm.
  • Adding global profile curvature terms to local gyrokinetic equations.

Main Results:

  • Achieved high-precision global simulation capability.
  • Identified two types of global corrections: a radial shift and a decorrelation effect.
  • The decorrelation effect is comparable to the E×B shear effect.

Conclusions:

  • The new method offers an intuitive framework for understanding global gyrokinetic simulations.
  • Combines the efficiency of local simulations with the accuracy of global ones.