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Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

A COMBINED RANS-LES STRATEGY WITH ARBITRARY INTERFACE LOCATION FOR NEAR-WALL FLOWS

pages 929-934
DOI: 10.1615/TSFP3.1550
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ABSTRACT

A hybrid RANS-LES methodology is proposed for simulating flows that demand a high-quality resolution of the near-wall region. The method allows the thickness of the near-wall (unsteady) RANS to be chosen freely. This layer is interfaced to the outer LES region subject to compatibility conditions for velocity and turbulent viscosity imposed across the interface. These are extracted dynamically as the simulation progresses. In the RANS layer, one-equation, k − l, models are currently used and interfaced to one-equation subgrid-scale models. The effectiveness of the method is examined by reference to fully-developed channel flow at Reb = 42000 and a separated flow in a channel constricted by curved hill-shaped obstructions.

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