arXiv:2611.09171v1 Announce Type: new Abstract: Preserving density bounds and mass conservation, together with a conservative momentum discretization and exact incompressibility, is a central challenge in high-order simulations of variable-density incompressible flow. We develop a structure-preserving discontinuous Galerkin method that couples conservative density transport with an \(H(\mathrm{div})\)-conforming mixed discretization of the momentum equation. The method uses a partitioned time integrator: density is advanced explicitly by strong-stability-preserving Runge--Kutta stages with a bound-preserving limiter, while momentum is updated by a linearly implicit backward differentiation formula. The transport velocities are extrapolated from previously computed mixed velocities. Because the discrete solenoidal space is linear, this extrapolation preserves elementwise zero divergence and single-valued normal traces, providing compatible transport velocities without an auxiliary reconstruction or projection. For source-free transport on triangular meshes with impermeable or periodic boundaries, we prove bounds for density cell averages and limiter control-point values under the stated spatial, quadrature, and stagewise Courant--Friedrichs--Lewy conditions. The conservative fluxes and mean-preserving limiter yield global mass conservation. Numerical experiments on triangular and structured rectangular meshes demonstrate the expected convergence rates, machine-level divergence errors, and bound preservation, including in a low-density regime with high density ratio.