DOI: 10.1615/THMT-18
ISBN Print: 978-1-56700-468-7
ISBN Online: 978-1-56700-467-0
ISSN Print: 2377-2816
Developing numerical wall function for large eddy simulation using eddy − viscosity models in the embedded RANS domain
RÉSUMÉ
This paper presents the methodology of a new wall function for large eddy simulation (LES). The numerical wall function for LES simulates two regions of the flow domain concurrently. The first region covers the entire flow domain and solves LES transport equations, and the grid is coarse in the near-wall region. The second region is much smaller and covers the near-wall area of the LES grid. The second region solves transient Reynolds Averaged Navier Stokes (RANS) transport equations and supplies the LES grid with wall shear stress information. In return, the RANS grid receives partial time-averaged quantities from the LES grid enabling the use of more advanced turbulence models in the RANS domain. The paper also presents results of testing the new method in a plane channel flow and a pipe bend geometry.