  In this paper, we present a positivity-preserving limiter for nodal
Discontinuous Galerkin disctretizations of the compressible Euler equations. We
use a Legendre-Gauss-Lobatto (LGL) Discontinuous Galerkin Spectral Element
Method (DGSEM) and blend it locally with a consistent LGL-subcell Finite Volume
(FV) discretization using a hybrid FV/DGSEM scheme that was recently proposed
for entropy stable shock capturing. We show that our strategy is able to ensure
robust simulations with positive density and pressure when using the standard
and the split-form DGSEM. Furthermore, we show the applicability of our FV
positivity limiter in extremely under-resolved vortex dominated simulations and
in problems with shocks.
