Large-Eddy Simulations with remeshed Vortex methods: An assessment and calibration of subgrid-scale models

de Crouy-Chanel, Marthe; Mimeau, Chloé; Mortazavi, Iraj; Mariotti, Alessandro; Salvetti, Maria Vittoria

doi:10.1016/j.compfluid.2024.106287

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2024

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

Kornev,

Samarbakhsh,

Darji

2024

Physics of Fluids

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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.

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