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Related Experiment Video

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High-performance computing-based exploration of flow control with micro devices.

Kozo Fujii1

  • 1Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan fujii@flab.isas.jaxa.jp.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|July 16, 2014
PubMed
Summary
This summary is machine-generated.

Dielectric barrier discharge (DBD) plasma actuators show promise for energy savings in fluid dynamics. Large-scale simulations reveal their effectiveness in controlling flow separation, especially at Reynolds numbers around 10^5, improving aerodynamic performance.

Keywords:
computational fluid dynamicsdielectric barrier discharge plasma actuatorflow controllarge eddy simulationmicro device

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Area of Science:

  • Fluid Dynamics
  • Plasma Physics
  • Aerodynamics

Background:

  • Flow separation control is crucial for enhancing aerodynamic performance and reducing energy consumption in fluid dynamic systems.
  • The precise mechanism by which dielectric barrier discharge (DBD) plasma actuators control flow separation remains unclear, hindering their practical application.
  • Advanced computational resources are necessary to investigate complex fluid phenomena like flow separation control.

Purpose of the Study:

  • To elucidate the mechanism of flow separation control using DBD plasma actuators.
  • To identify optimal device parameters for effective flow control.
  • To assess the potential of DBD plasma actuators for energy savings and noise reduction in fluid dynamic systems.

Main Methods:

  • Large-scale computations were performed using the Japanese Petaflops supercomputer 'K'.
  • Simulations were conducted for three distinct Reynolds numbers to study flow separation control.
  • Flow analysis was performed to understand the key features of control mechanisms.

Main Results:

  • DBD plasma actuators demonstrated significant effectiveness in controlling flow separation at a Reynolds number of approximately 10^5.
  • A substantial increase in the lift-to-drag ratio was observed at higher angles of attack post-stall.
  • Partial control of separated flow was achieved at higher Reynolds numbers, with identified key features for improved control.

Conclusions:

  • DBD plasma actuators are highly effective for flow separation control, particularly around a Reynolds number of 10^5, leading to improved aerodynamic efficiency.
  • The study provides crucial knowledge on suitable device parameters for DBD plasma actuators.
  • These findings highlight the potential of DBD plasma actuators to reduce fuel consumption and contribute to environmental sustainability through enhanced aerodynamic performance.