  The robustness and accuracy of marginally resolved discontinuous Galerkin
spectral element computations are evaluated for the standard formulation and a
kinetic energy conserving split form on complex flow problems of physical and
engineering interest, including the flow over a square cylinder, an airfoil and
a plane jet. It is shown that the kinetic energy conserving formulation is
significantly more robust than the standard scheme for under-resolved
simulations. A disadvantage of the split form is the restriction to
Gauss-Lobatto nodes with the inherent underintegration and lower accuracy as
compared to Gauss quadrature used with the standard scheme. While the results
support the higher accuracy of the standard Gauss form, lower numerical
robustness and spurious oscillations are evident in some cases, giving the
advantage to the kinetic energy conserving scheme for marginally resolved
numerical simulations.
