@Article{CiCP-21-577,
author = {Heng Xiao, Jian-Xun Wang and Patrick Jenny},
title = {An Implicitly Consistent Formulation of a Dual-Mesh Hybrid LES/RANS Method},
journal = {Communications in Computational Physics},
year = {2018},
volume = {21},
number = {2},
pages = {577--590},
abstract = {<p style="text-align: justify;">A consistent dual-mesh hybrid LES/RANS framework for turbulence modeling
has been proposed recently (H. Xiao, P. Jenny, A consistent dual-mesh framework
for hybrid LES/RANS modeling, J. Comput. Phys. 231 (4) (2012)). To better
enforce componentwise Reynolds stress consistency between the LES and the RANS
simulations, in the present work the original hybrid framework is modified to better
exploit the advantage of more advanced RANS turbulence models. In the new
formulation, the turbulent stresses in the filtered equations in the under-resolved regions
are directly corrected based on the Reynolds stresses provided by the RANS
simulation. More precisely, the new strategy leads to implicit LES/RANS consistency,
where the velocity consistency is achieved indirectly via imposing consistency on the
Reynolds stresses. This is in contrast to the explicit consistency enforcement in the original
formulation, where forcing terms are added to the filtered momentum equations
to achieve directly the desired average velocity and velocity fluctuations. The new
formulation keeps the averaging procedure for the filtered quantities and at the same
time preserves the ability of the original formulation to conform with the physical differences
between LES and RANS quantities. The modified formulation is presented,
analyzed, and then evaluated for plane channel flow and flow over periodic hills. Improved
predictions are obtained compared with the results obtained using the original
formulation.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.220715.150416a},
url = {http://global-sci.org/intro/article_detail/cicp/11251.html}
}