Scrutinizing dynamic cumulant lattice Boltzmann large eddy simulations for turbulent channel flows

Enthalten in
Computation 
Volume
10
Issue
10
Article Number
171
Citation
Computation 10 (10): 171 (2022)
Publisher DOI
10.3390/computation10100171
Scopus ID
2-s2.0-85140835854
Publisher
Multidisciplinary Digital Publishing Institute
This technical paper outlines the predictive performance of a recently published dynamic cumulant lattice Boltzmann method (C-LBM) to model turbulent shear flows at all resolutions. Emphasis is given to a simple strategy that avoids a frequently observed velocity overshoot phenomenon near rigid walls when combining the C-LBM with an all-resolution (universal) wall function. The examples included are confined to turbulent channel flow results for a variety of friction Reynolds numbers within 180 and 50,000, obtained on a sequence of isotropic, homogeneous grids that feature non-dimensional lattice spacings using inner coordinates from 4 to 2200. The results indicate that adjusting the near-wall distance of the first fluid node, i.e., the intersection of the wall with the first lattice edge, to the resolution provides a reasonably simple, robust, and accurate supplement to the all-resolution C-LBM approach. The investigated wall function/C-LBM combination displays a remarkable predictive performance for all investigated resolutions.
Schlagworte
lattice Boltzmann method
cumulant collision operator
turbulence simulation
DNS
LES
VLES
wall function
DDC Class
004: Informatik