Hybrid grid-free and grid-based method for simulation of turbulent flows

The principles of a new vortex particle intensified large eddy simulation (VπLES) method based on grid-based/grid-free techniques are described. The method is based on the idea of dividing the flow into large-scale and small-scale motions, with the first being solved on a grid, and the second using...

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Bibliographic Details
Published in:Physics of fluids (1994) 2024-07, Vol.36 (7)
Main Authors: Kornev, N., Samarbakhsh, S., Darji, J.
Format: Article
Language:English
Subjects:
Anisotropy
Fluid dynamics
Fluid flow
Free jets
Isotropic turbulence
Large eddy simulation
Particle decay
Particle methods (mathematics)
Reduced order models
Turbulent flow
Vortices
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Summary:The principles of a new vortex particle intensified large eddy simulation (VπLES) method based on grid-based/grid-free techniques are described. The method is based on the idea of dividing the flow into large-scale and small-scale motions, with the first being solved on a grid, and the second using the vortex particle method. This article provides a brief overview of previous validation and verification results and further illustrates the advantages of VπLES for passive mixing in homogeneous decaying isotropic turbulence and free jet. VπLES, which is a kind of reduced-order model with a direct reconstruction of the subgrid motion by vortex particles, was used to study the anisotropy of small-scale motion in a free jet. The application of VπLES to the flow in the channel makes it possible to restore the high-frequency part of the spectrum with relatively coarse resolution due to explicit modeling of small-scale vortices.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0218244