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Synthetic Turbulence Generators for RANS-LES Interfaces in Zonal Simulations of Aerodynamic and Aeroacoustic Problems

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Abstract

The paper presents the detailed formulation and validation results of simple and robust procedures for the generation of synthetic turbulence aimed at providing artificial turbulent content at the RANS-to-LES interface within a zonal Wall Modelled LES of attached and mildly separated wall-bounded flows. There are two versions of the procedure. The aerodynamic version amounts to a minor modification of a synthetic turbulence generator developed by the authors previously, but the acoustically adapted version is new and includes an internal damping layer, where the pressure field is computed by “weighting” of the instantaneous pressure fields from LES and RANS. This is motivated by the need to avoid creating spurious noise as part of the turbulence generation. In terms of pure aerodynamics, the validation includes canonical shear flows (developed channel flow, zero pressure gradient boundary layer, and plane mixing layer), as well as a more complex flow over the wall-mounted hump with non-fixed separation and reattachment, with emphasis on a rapid conversion from modeled to resolved Reynolds stresses. The aeroacoustic applications include the flow past a trailing edge and over a two-element airfoil configuration. In all cases the methodology ensures a very acceptable accuracy for the mean flow, turbulent statistics and, also, the near- and far-field noise.

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Authors and Affiliations

  1. Saint-Petersburg State Polytechnic University, Saint-Petersburg, Russia

    Michael L. Shur, Michael K. Strelets & Andrey K. Travin

  2. New Technologies and Services, LLC, Saint-Petersburg, Russia

    Michael L. Shur, Michael K. Strelets & Andrey K. Travin

  3. Boeing Commercial Airplanes, Seattle, USA

    Philippe R. Spalart

Authors
  1. Michael L. Shur
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  2. Philippe R. Spalart
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  3. Michael K. Strelets
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  4. Andrey K. Travin
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Correspondence to Michael K. Strelets.

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Shur, M.L., Spalart, P.R., Strelets, M.K. et al. Synthetic Turbulence Generators for RANS-LES Interfaces in Zonal Simulations of Aerodynamic and Aeroacoustic Problems. Flow Turbulence Combust 93, 63–92 (2014). https://doi.org/10.1007/s10494-014-9534-8

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