Dynamic models for Large Eddy Simulation of compressible flows with a high order DG method. (20th November 2015)

• Record Type: Journal Article
• Authors: Abbà, A.; Bonaventura, L.; Nini, M.; Restelli, M.
• Is Part Of: Computers & fluids. Volume 122(2015)
• Page Start: 209
• Page End: 222
• Publication Date: 2015-11-20
• Subjects: Turbulence modelling -- Large Eddy Simulation -- Discontinuous Galerkin methods -- Compressible flows -- Dynamic models; Fluid dynamics -- Data processing -- Periodicals; 532.050285
• DOI: 10.1016/j.compfluid.2015.08.021
• Languages: English
• ISSNs: 0045-7930

Abstract

Highlights: Dynamic LES models are implemented in VMS-DG framework. An anisotropic model for the incompressible case is extended to the compressible case. Dynamic models perform better than Smagorinsky models, also in a VMS-DG framework. Abstract: The impact of dynamic models for applications to LES of compressible flows is assessed in the framework of a numerical model based on high order discontinuous finite elements. The projections onto lower dimensional subspaces associated with lower degree basis functions are used as LES filter, along the lines proposed in Variational Multiscale templates. Comparisons with DNS results available in the literature for plane and constricted channel flows at Mach numbers 0.2, 0.7 and 1.5 show clearly that the dynamic models are able to improve the prediction of most key features of the flow with respect to the Smagorinsky models employed so far in a VMS-DG context.