Grey-area mitigation using commutation terms at the interfaces in hybrid RANS-LES modeling
Journal article, 2018

© 2018, Springer International Publishing AG. With the aim to mitigate the grey area at the RANS-LES interface, the effect of commutation terms is investigated. Simulations of fully developed channel flow and spatially developing boundary layer flow are presented using the commutation terms at the RANS-LES interfaces. The commutation terms are added as source terms in the k, ω and momentum equations of a zonal RANS-LES model. It is concluded that as an inlet in embedded LES of the developing boundary layer flow, the use of the proposed commutation terms are needed for the LES simulated flow to accurately predict the skin friction. However, it is demonstrated for flows where the RANS-LES interface aligns with the mean flow direction that the effect of the proposed interface methodology is weak.


Sebastian Arvidson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics


Lars Davidson

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Peng Shia-Hui

Chalmers, Mechanics and Maritime Sciences (M2), Fluid Dynamics

Swedish Defence Research Agency (FOI)

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

1612-2909 (ISSN) 1860-0824 (eISSN)

Vol. 137 113-124

Subject Categories

Geophysical Engineering

Ocean and River Engineering

Fluid Mechanics and Acoustics



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