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Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

A NEW SUBGRID-SCALE STRESS TRANSPORT MODEL AND ITS APPLICATION TO LES OF EVOLVING COMPLEX TURBULENT FLOWS

pages 1061-1066
DOI: 10.1615/TSFP4.1760
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要約

A new partialy integrated transport model (PITM) for subgrid-scale stresses and dissipation rate is proposed for Large eddy simulations using relatively coarse grids of unsteady flows which present non-equilibrium turbulence spectra. The use of transport equations for all the subgrid-scale stress components allows to take into account more precisely the turbulent processes of production, transfer, pressure redistribution effects and dissipation, and the concept of turbulent viscosity is no longer necessary. In this study, a formally consistent derivation of the model is obtained when the cutoff location is varied, which guaranties compatibility with the two extreme limits that are the full statistical Reynolds stress transport model and direct numerical simulation. So, this approach enables to bridge URANS and LES methods with "seamless coupling" (Hanjalic et al., 2004). The present model is first against on the well known fully developed turbulent channel flow. The applications to the channel flow with wall mass injection are successfully performed for two different channel heights. The flows are characterized by the development of natural unsteadiness with a transition process from laminar to turbulent regime or by an acoustic resonant regime subjected to the vortex shedding mechanism.

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