A closure model for lagrangian tracking of particles, starting from LES flow data, is presented. The basic idea is to reconstruct the velocity field from the knowledge of its filtered values on a coarse grid, by means of fractal interpolation. Validation is carried out by means of a priori tests for turbulent channel flow. DNS data are filtered through a cut-off filter; different filter widths are considered. Three sets of particles having different relaxation times are tracked. Particle statistics are computed, with and without fractal interpolation, and compared to those obtained starting from the DNS flow fields.
On the closure of particle motion equations in large-eddy simulation
SALVETTI, MARIA VITTORIA;
2006-01-01
Abstract
A closure model for lagrangian tracking of particles, starting from LES flow data, is presented. The basic idea is to reconstruct the velocity field from the knowledge of its filtered values on a coarse grid, by means of fractal interpolation. Validation is carried out by means of a priori tests for turbulent channel flow. DNS data are filtered through a cut-off filter; different filter widths are considered. Three sets of particles having different relaxation times are tracked. Particle statistics are computed, with and without fractal interpolation, and compared to those obtained starting from the DNS flow fields.File in questo prodotto:
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