par Viré, Axelle 
;Knaepen, Bernard
Référence Springer proceedings in physics, 132, page (795-798)
Publication Publié, 2009
;Knaepen, Bernard Référence Springer proceedings in physics, 132, page (795-798)
Publication Publié, 2009
Article révisé par les pairs
| Résumé : | The aim of large eddy simulations (LES) is to reproduce with accuracy the large scale properties of a turbulent flow at a much lower computational cost than required by direct numerical simulations (DNS). The main challenge of LES is thus to appropriately model the influence of the subgrid scales on the resolved scales. Here, the attention is restricted to finite volume methods, without explicit filtering. In this framework, the subgrid scale modeling is related to the volume averaging on the coarse mesh and is responsible for the destruction of small scale information. Because the mesh is coarse, the discrete operators needed for differentiations and interpolations introduce further errors that might be significant. For differentiation operators, the severity of this problem increases with the order of the derivative taken, so that the physical relevance of the numerical results becomes questionable. |
