TY - JOUR
T1 - Effect of inlet conditions on the accuracy of large eddy simulations of a turbulent rectangular wake
AU - Nilsen, Katrine M.
AU - Kong, Bo
AU - Fox, Rodney O.
AU - Hill, James C.
AU - Olsen, Michael G.
PY - 2014/8/15
Y1 - 2014/8/15
N2 - A large eddy simulation (LES) study was performed on a turbulent incompressible wake flow in a rectangular channel. The simulation results were evaluated using particle image velocimetry (PIV) data from a previous experimental study of the same flow (Liu et al., 2013). Comparisons were made of one-point statistics as well as spatial correlations.An extensive pre-simulation study was carried out in which the effect of inlet conditions, grid resolution, time step and subgrid model was investigated and the parameters were optimized. Using the digital filter method of Klein et al. (2003), turbulent inflow velocities were generated based on velocity mean and variance obtained from the experimental data and correlation length scales. It was found that the simulation results in large parts of the domain were strongly dependent on the inlet length scales specified. With a suitable set of length scales, the inlet method was successful at providing inlet conditions that generated accurate simulation results.The very good agreement seen between experiment and simulation demonstrates LES as a method that, with carefully selected inlet conditions, not only can predict the pointwise turbulence statistics of a liquid wake flow, but also capture key features of its large-scale turbulent structures.
AB - A large eddy simulation (LES) study was performed on a turbulent incompressible wake flow in a rectangular channel. The simulation results were evaluated using particle image velocimetry (PIV) data from a previous experimental study of the same flow (Liu et al., 2013). Comparisons were made of one-point statistics as well as spatial correlations.An extensive pre-simulation study was carried out in which the effect of inlet conditions, grid resolution, time step and subgrid model was investigated and the parameters were optimized. Using the digital filter method of Klein et al. (2003), turbulent inflow velocities were generated based on velocity mean and variance obtained from the experimental data and correlation length scales. It was found that the simulation results in large parts of the domain were strongly dependent on the inlet length scales specified. With a suitable set of length scales, the inlet method was successful at providing inlet conditions that generated accurate simulation results.The very good agreement seen between experiment and simulation demonstrates LES as a method that, with carefully selected inlet conditions, not only can predict the pointwise turbulence statistics of a liquid wake flow, but also capture key features of its large-scale turbulent structures.
KW - Fluid mechanics
KW - Large eddy simulation
KW - Particle image velocimetry
KW - Turbulence
KW - Turbulent wake
UR - http://www.scopus.com/inward/record.url?scp=84899559836&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2014.03.069
DO - 10.1016/j.cej.2014.03.069
M3 - 文章
AN - SCOPUS:84899559836
SN - 1385-8947
VL - 250
SP - 175
EP - 189
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -