Lagrangian Vortex computations of turbine wakes: recent improvements using Poletto’s Synthetic Eddy Method (SEM) to account for ambient turbulence

Camille Choma Bex (1, 2) , Grégory Pinon (1) , Myriam Slama (1) , Benoist Gaston , Grégory Germain (2) , Elie Rivoalen (3, 1)

1 LOMC - Laboratoire Ondes et Milieux Complexes
2 LCSM - Laboratoire Comportement des Structures en Mer
3 LMN - Laboratoire de Mécanique de Normandie

This paper presents possible techniques for modelling ambient turbulence in the Lagrangian Vortex Method formalism. Due to the fact that regular Synthetic Eddy Method (SEM) already presented in previous studies is not divergence free by definition; improvements were necessary to develop a similar SEM method with such a divergence free property. The recent improvements formulated by R. Poletto give the way to such a possibility. This new Divergence Free Synthetic Eddy Method (DFSEM) is presented here in comparison with the regular SEM. Obtained numerical velocity fields are compared in terms of convergence properties, Power Spectral Density and also Taylor macro-scale. Finally, turbine wakes are computed with both the recent Poletto’s DFSEM and the regular Jarrin’s SEM to highlight differences. At this stage of development, the DFSEM seems very promising even though some improvements are still necessary.

Domains: Fluids mechanics [physics.class-ph]; Reactive fluid environment

Camille Choma Bex, Grégory Pinon, Myriam Slama, Benoist Gaston, Grégory Germain, et al.. Lagrangian Vortex computations of turbine wakes: recent improvements using Poletto’s Synthetic Eddy Method (SEM) to account for ambient turbulence. Journal of Physics: Conference Series, 2020, 1618 (6), pp.062028. ⟨10.1088/1742-6596/1618/6/062028⟩. ⟨hal-03776677⟩