Abstract
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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
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)
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)
Bhushan, S., Walters, D.K.: A dynamic hybrid Reynolds-averaged Navier Stokes-large eddy simulation modelling framework. Phys. Fluids 24 (2012)
Germano, M.: Turbulence: the filtering approach. J. Fluid Mech. 238, 325–336 (1992)
Germano, M.: Properties of the hybrid RANS/LES filter. Theor. Comput. Fluid Dyn. 17(4), 225–231 (2004)
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)
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)
Rajamani, B., Kim, J.: A hybrid-filter approach to turbulence simulation. Flow Turbul. Combust. 85, 421–441 (2010)
Restelli M. et al.: FEMilaro, a finite element toolbox effective substances. https://bitbucket.org/mrestelli/femilaro/wiki/Home
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)
Acknowledgements
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.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2019 Springer Nature Switzerland AG
About this paper
Cite this paper
Abbà, A., Germano, M., Nini, M. (2019). A RANS Assisted LES Approach. In: Salvetti, M., Armenio, V., Fröhlich, J., Geurts, B., Kuerten, H. (eds) Direct and Large-Eddy Simulation XI. ERCOFTAC Series, vol 25. Springer, Cham. https://doi.org/10.1007/978-3-030-04915-7_22
Download citation
DOI: https://doi.org/10.1007/978-3-030-04915-7_22
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-04914-0
Online ISBN: 978-3-030-04915-7
eBook Packages: EngineeringEngineering (R0)