@Article{cmes.2020.08728,
AUTHOR = {Primož Kocutar, Jure Ravnik, Leopold Škerget},
TITLE = {Hybrid LES/URANS Simulation of Rayleigh-Bénard Convection Using BEM},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {123},
YEAR = {2020},
NUMBER = {1},
PAGES = {1--22},
URL = {http://www.techscience.com/CMES/v123n1/38482},
ISSN = {1526-1506},
ABSTRACT = {In this paper, we develop and test a unified hybrid LES/URANS turbulence
model with two different Large Eddy Simulation (LES) turbulence models. The numerical
algorithm is based on the Boundary Element Method. In the existing hybrid LES/URANS
turbulence model we implemented a new Smagorinsky LES turbulence model. The
hybrid LES/URANS turbulence model is unified, which means that the LES/URANS
interface is changed dynamically during simulation using a physical quantity. In order
to define the interface between LES and unsteady Reynolds Averaged Navier Stokes
(URANS) zones during the simulation, we use the Reynolds number based on turbulent
kinetic energy as a switching criterion. This means that the flow characteristics define
where the sub-grid scale or URANS effective viscosity and thermal conductivity are
used in the governing equations in the next time step. In unified hybrid turbulence
models, only one set of governing equations is used for LES and URANS regions.
The developed hybrid LES/URANS model was tested on non-isothermal, unsteady and
turbulent Rayleigh-Bénard Convection and compared with an existing model, where LES
is based on turbulent kinetic energy. The hybrid turbulence model was implemented within
a numerical algorithm based on the Boundary-Domain Integral Method, where a single
domain and sub-domain approaches were used. The numerical algorithm uses governing
equations written in a velocity-vorticity form. The false transient time scheme is used for
the kinematics equation.},
DOI = {10.32604/cmes.2020.08728}
}