Vortex Flows and Related Numerical Methods II
ESAIM: Proceedings,
Vol. 1, 1996, pp. 49-64
Towards Lagrangian Large Vortex Simulation
John R. Mansfield, Omar M. Knio and Charles Meneveau
Department of Mechanical Engineering
The Johns Hopkins University
Baltimore, MD 21218, USA
Abstract
Construction of a Lagrangian large-eddy-simulation scheme is performed
based on filtering the vorticity transport equation and using simple
eddy-diffusivity models to account for subgrid-scale "Helmholtz"
stresses. The resulting governing equations are simulated using a
three-dimensional particle method which discretizes the vorticity
field into Lagrangian vortex elements of finite overlapping cores.
Vortex elements are transported along particle trajectories, while
their vorticities evolve according to stretching and tilting by the
resolved scales, molecular diffusion, and subgrid-scale stresses. The
behavior of the model is discussed in light of limited
three-dimensional computations of transitional vortex rings. It is
shown that the model can capture the large-scale features of the flow
without requiring an excessively large number of elements.
Vortex Flows and Related
Numerical Methods II
Contents / Table des matières
Index by Author / Index par auteur