  The study performs large-eddy simulations of supersonic free jet flows using
the Discontinuous Galerkin Spectral Element Method (DGSEM). The main objective
of the present work is to assess the resolution requirements for adequate
simulation of such flows with the DGSEM approach. The study looked at the
influence of the mesh and the spatial discretization accuracy on the simulation
results. The present analysis involves four simulations, incorporating three
different numerical meshes and two different orders of spatial discretization
accuracy. The numerical meshes are generated with distinct mesh topologies and
refinement levels. Detailed descriptions of the grid generation and refinement
procedures are presented. The study compares flow property profiles and power
spectral densities of velocity components with experimental data. The results
show a consistent improvement in the computed data as the simulation resolution
increases. This investigation revealed a trade-off between mesh and polynomial
refinement, striking a balance between computational cost and the accuracy of
large-eddy simulation results for turbulent flow analyses.
