  This paper explores two Large Eddy Simulation (LES) approaches within the
framework of the high-order discontinuous Galerkin solver, Horses3D. The
investigation focuses on an Inverted Multi-element Wing in Ground Effect (i.e.
2.5D Imperial Front Wing section) representing a Formula 1 front wing, and
compares the strengths and limitations of the two LES methods. The explicit LES
formulation relies on the Vreman model, that adapts to laminar, transitional
and turbulent regimes. The numerical formulation uses nodal basis functions and
Gauss points. The implicit LES formulation, does not require explicit
turbulence modeling but relies in the discretization scheme. We use the
Kennedy-Gruber entropy stable formulation to enhance stability in under
resolved simulations, since we recover the continuous properties such as
entropy conservation at a discrete level. This formulation employs
Gauss-Lobatto points, which downgrades the accuracy of integration but allows
for larger time steps in explicit time integration. We compare our results to
Nektar++ [1] showing that both LES techniques provide results that agree well
with the reference values. The implicit LES shows to better capture transition
and allows for larger time steps at a similar cost per iteration. We conclude
that this implicit LES formulation is very attractive for complex simulations.
