Clustering of passive tracers in a random acoustic velocity field

We consider the effects of passive tracer clustering (e.g., the magnetic field energy in stellar atmospheres) in a random acoustic velocity field. A method for numerical modeling of a two-dimensional random acoustic field is proposed. The field is described by a correlation tensor defined by traveli...

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Bibliographic Details
Published in:Physics of fluids (1994) 2024-05, Vol.36 (5)
Main Authors: Koshel, Konstantin V., Stepanov, Dmitry V.
Format: Article
Language:English
Subjects:
Acoustic velocity
Clustering
Density
Dissipation
Mathematical models
Numerical models
Sound fields
Stellar atmospheres
Stellar magnetic fields
Tensors
Velocity distribution
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Description
Summary:We consider the effects of passive tracer clustering (e.g., the magnetic field energy in stellar atmospheres) in a random acoustic velocity field. A method for numerical modeling of a two-dimensional random acoustic field is proposed. The field is described by a correlation tensor defined by traveling isotropic waves, taking into account dissipation. Two metrics for measuring the clustering effects are used: concentration and density. Using numerical modeling, we show that the tracer concentration is almost always clustered. The situation with the density is different; as the dissipation tends to zero, the time to reach the clustered states increases significantly. In addition, due to the tracer transport out of the density clustering regions, only a part of the tracer is clustered. For the presented analyses, we considered ensembles of Lagrangian particles and introduced and applied the statistical topography methodology.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0206696