A RANS Assisted LES Approach

  • A. AbbàEmail author
  • M. Germano
  • M. Nini
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 25)


In the particular approach herein proposed, RANS and LES are combined in order to achieve a detailed description of turbulent flows without incurring in infeasible computational effort. This model is based on the hybrid filter approach proposed by Germano [5]. One of the most interesting point of this approach, is that the equations obtained by filtering Navier–Stokes equations, already include terms which are able to represent the interactions between RANS and LES regions. Therefore no further artificial terms are needed to allow the appropriate energy and momentum transfer between RANS and LES. This approach has already been tested  [8, 10] showing promising results.



The presented numerical results have been obtained with the computational resources provided by CINECA (Italy) and NIIF (Hungary), respectively within the high performance computing projects ISCRA-C LES-DiG and DECI-11 HyDiG.


  1. 1.
    Abbà, A., Bonaventura, L., Nini, M., Restelli, M.: Dynamic models for large eddy simulation of compressible flows with a high order DG method. Comp. Fluids 122, 209–222 (2015)MathSciNetCrossRefGoogle Scholar
  2. 2.
    Abbà, A., Campaniello, D., Nini, M.: Filter size definition in anisotropic subgrid models for large eddy simulation on irregular grids. J. Turbul. 18(6), 589–610 (2017)MathSciNetCrossRefGoogle Scholar
  3. 3.
    Bhushan, S., Walters, D.K.: A dynamic hybrid Reynolds-averaged Navier Stokes-large eddy simulation modelling framework. Phys. Fluids 24 (2012)CrossRefGoogle Scholar
  4. 4.
    Germano, M.: Turbulence: the filtering approach. J. Fluid Mech. 238, 325–336 (1992)MathSciNetCrossRefGoogle Scholar
  5. 5.
    Germano, M.: Properties of the hybrid RANS/LES filter. Theor. Comput. Fluid Dyn. 17(4), 225–231 (2004)CrossRefGoogle Scholar
  6. 6.
    Moser, R.D., Kim, J., Mansour, N.N.: Direct numerical simulation of turbulent channel flow up to \(Re_\tau =590\). Phys. Fluids 11, 943–945 (1999)CrossRefGoogle Scholar
  7. 7.
    Nini, M., Abbà, A., Germano, M., Restelli, M.: Analysis of a hybrid RANS/LES model using RANS reconstruction. Progress in Turbulence VI Proceedings of the iTi 2014–Conference on Turbulence. Springer Proceedings in Physics, vol. 165, pp. 299–303. Springer International Publishing, Switzerland (2016)Google Scholar
  8. 8.
    Rajamani, B., Kim, J.: A hybrid-filter approach to turbulence simulation. Flow Turbul. Combust. 85, 421–441 (2010)CrossRefGoogle Scholar
  9. 9.
    Restelli M. et al.: FEMilaro, a finite element toolbox effective substances.
  10. 10.
    Sànchez-Rocha, M., Menon, S.: An order-of-magnitude approximation for the hybrid terms in the compressible hybrid RANS/LES governing equations. J. Turbul. 12(16), 1–22 (2011)MathSciNetGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Aerospace Science and TechnologyPolitecnico di MilanoMilanItaly
  2. 2.Department of Civil and Environmental EngineeringDuke UniversityDurhamUSA

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