The paper presents a consistent large eddy simulation (LES) framework which is particularly suited for implicitly filtered LES with unstructured finite volume (FV) codes. From the analysis of the subgrid-scale (SGS) stress tensor arising in this new LES formulation, a novel form of scale-similar SGS model is proposed and combined with a classical eddy viscosity term. The constants in the resulting mixed model are then computed trough a new, cheaper, dynamic procedure based on a consistent redefinition of the Germano identity within the new LES framework. The dynamic mixed model is implemented in a commercial, unstructured, finite volume solver and numerical tests are performed on the turbulent pipe ow at Re_ = 320-1142, showing the flexibility and improvements of the approach over classical modeling strategies. Some limitations of the proposed implementation are also highlighted.
|Titolo:||A dynamic mixed subgrid-scale model for large eddy simulation on unstructured grids: application to turbulent pipe flows|
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||01.1 Articolo in Rivista|
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|Lampitella_2014_J._Phys.__Conf._Ser._501_012020.pdf||Publisher’s version||Accesso apertoVisualizza/Apri|