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Accelerating Fluids01:17

Accelerating Fluids

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.
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Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...
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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
13:02

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Published on: February 27, 2016

Real-time liquid-crystal atmosphere turbulence simulator with graphic processing unit.

Lifa Hu1, Li Xuan, Dayu Li

  • 1Changchun Institute of Optics, Fine Mechanics and Physics, Changchun, Jilin 130033, China. hulifa@ciomp.ac.cn

Optics Express
|April 29, 2009
PubMed
Summary

This study introduces a novel liquid-crystal (LC) atmosphere turbulence simulator (ATS) achieving real-time phase generation at 128 Hz. This high-speed simulation advances atmospheric turbulence research.

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Last Updated: Jun 23, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
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Published on: February 27, 2016

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
10:53

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Area of Science:

  • Optical Engineering
  • Computational Physics
  • Atmospheric Science

Background:

  • Atmospheric turbulence simulation is crucial for optical systems.
  • Existing methods often lack real-time capabilities.
  • Liquid-crystal technology offers potential for dynamic phase modulation.

Purpose of the Study:

  • To develop a real-time atmosphere turbulence simulator (ATS).
  • To achieve high-speed generation of turbulence phases.
  • To enhance the performance of optical systems affected by atmospheric turbulence.

Main Methods:

  • Utilized the Fourier series (FS) method for phase generation.
  • Implemented a real matrix expression for turbulence phases.
  • Employed a liquid-crystal on silicon (LCOS) device with 256x256 pixels.
  • Leveraged a graphic processing unit (GPU) for accelerated computation.

Main Results:

  • Achieved a total phase generation time of approximately 7.8 ms.
  • Implemented parallel processing for improved simulation speed.
  • Reached a real-time turbulence phase-generation frequency of up to 128 Hz.
  • Demonstrated the highest speed for real-time turbulence phase generation to date.

Conclusions:

  • The developed LC ATS provides unprecedented real-time performance.
  • This technology significantly advances the field of atmospheric turbulence simulation.
  • The high-frequency phase generation capability has broad implications for adaptive optics and optical communication.