Print Email Facebook Twitter A Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales Part of: 15th EuropeanTurbulence Conference 2015 (ETC15)· list the conference papers Title A Dynamic Subfilter-scale Stress Model for Large Eddy Simulations Based on Physical Flow Scales Author Rouhi, A. Piomelli, U. Geurts, B. Date 2015-08-27 Abstract We propose a new definition of the length scale in an eddy-viscosity model for large-eddy simulations (LES). This formulation extends and generalizes a previous proposal [Piomelli, Rouhi and Geurts, Proc. ETMM10, 2014], in which the LES length scale was expressed in terms of the integral length-scale of turbulence determined by the flow characteristics and explicitly decoupled from the simulation grid; this approach was named Integral Length-Scale Approximation (ILSA). As in the original ILSA, the model coefficient was determined by the user, and required to maintain a desired contribution of the unresolved, subfilter scales (SFS) to the global transport. We propose a local formulation (local ILSA) in which the model coefficient is local in space, allowing a precise control over SFS activity as a function of location. This new formulation preserves the properties of the global model; application to channel flow and backward-facing step verifies its features and accuracy. Subject filteringturbulence modellinglarge eddy simulation To reference this document use: http://resolver.tudelft.nl/uuid:1b831843-a6e4-4b3d-b39d-4efaf7e4f6e8 Part of collection Conference proceedings Document type conference paper Rights (c) 2015 the Authors Files PDF 16.pdf 253.95 KB Close viewer /islandora/object/uuid:1b831843-a6e4-4b3d-b39d-4efaf7e4f6e8/datastream/OBJ/view