  Large Eddy Simulation (LES) with dynamic Smagorinsky model has been applied
to numerically investigate the complicated flow structures that evolve in the
near wake of a cylindrical after body aligned with a uniform Mach 2.46 flow.
Mean flow field properties obtained from numerical simulations, such as axial
velocity, pressure on base surface, have been compared with the experimental
measurements as well as with other published results. It has been found that
standard k-epsilon model fails to predict the flow properties in the
recirculation region where better agreement has been observed between the data
obtained from LES and experimental measurements. Flow Statistics like turbulent
kinetic energy and primary Reynolds stress have also been calculated and
compared with the results obtained from experiments in order to quantitatively
assess the ability of LES technique to predict the turbulence properties of
flow field in the highly compressible shear layer region. The data obtained
from LES has been further analyzed to understand the evolution of coherent
structures in the flow field. Proper Orthogonal Decomposition (POD) of the data
obtained from central plane in the wake region has been performed in order to
reveal the most energetic structures present in the flow field.
