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Synchronization of two coupled turbulent fires.
Kazushi Takagi1, Hiroshi Gotoda1, Takaya Miyano2
1Department of Mechanical Engineering, Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan.
Chaos (Woodbury, N.Y.)
|January 8, 2020
Summary
This study reveals scale-free networks in turbulent fires, with intermittent scale-free properties. Two fires synchronize in close proximity, but this effect disappears in well-developed turbulent plumes.
Area of Science:
- Fluid dynamics
- Combustion science
- Network theory
Background:
- Turbulent fires exhibit complex dynamics.
- Understanding fire synchronization is crucial for safety and modeling.
- Scale-free properties are observed in various complex systems.
Purpose of the Study:
- To numerically investigate the scale-free nature of buoyancy-induced turbulent fires.
- To analyze the synchronization phenomenon between two coupled turbulent fires.
- To determine the influence of source distance on fire synchronization.
Main Methods:
- Numerical simulations of turbulent fire dynamics.
- Analysis of vortex networks and their properties.
- Investigation of fire synchronization based on source separation.
Main Results:
- A scale-free structure was identified in weighted networks between vortices.
- The lifetime of the scale-free property follows a power law, indicating intermittency.
- Reduced distance between fire sources leads to synchronization in the near field via transverse vortex rings.
- Synchronization diminishes in the far field, forming distinct turbulent plumes.
Conclusions:
- Turbulent fires exhibit intermittent scale-free network characteristics.
- Fire synchronization is a near-field phenomenon dependent on source proximity.
- Far-field plume behavior is independent of initial source separation.
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