@Article{fdmp.2020.010829,
AUTHOR = {Liang Ce, Yongchen Pan},
TITLE = {Shear Flows in the Near-Turbulent Wake Region of High Speed Trains},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {16},
YEAR = {2020},
NUMBER = {6},
PAGES = {1115--1128},
URL = {http://www.techscience.com/fdmp/v16n6/40844},
ISSN = {1555-2578},
ABSTRACT = {Two flow cases for scaled high speed train models with different length
are numerically analyzed in the framework of the improved delayed detachededdy simulation model. Specific attention is paid to the shear flows and related
mechanisms in the near turbulent wake created by these moving models. In particular, a comparative analysis is made on the distributions of turbulent kinetic
energy (TKE) and turbulence production (TP) in planes perpendicular to the
streamwise direction. The numerical results suggest that, in the wake region very
close to the tail, significant TKE and TP can be ascribed to the dynamic interaction between powerful eddies and strong shear, which explain why these quantities are sensitive to the shear strength. The shear flows are essentially governed by
the boundary layers developing along the streamwise direction on the train surfaces, especially from the under-body region and the side walls. For other positions located in the downstream direction away from the tail, the interaction of
vortices with the non-slip ground serves as a mechanism to promote transfer of
energy from weak eddies to turbulence through the shear present in planes parallel
to the ground.},
DOI = {10.32604/fdmp.2020.010829}
}