A well-known issue associated with the use of fully conservative schemes in
multicomponent-flow simulations is the generation of spurious pressure
oscillations at contact interfaces. These oscillations can rapidly lead to
solver divergence even in the presence of smooth interfaces that are not fully
resolved. In this note, we compare various strategies for reducing such
oscillations that do not (a) introduce conservation error, (b) rely on
artificial viscosity or limiting, or (c) degrade order of accuracy in smooth
regions of the flow. The considered test case is one-dimensional advection of a
high-pressure nitrogen/n-dodecane thermal bubble using the thermally perfect
gas model. Several results are presented that contradict those corresponding to
the more conventional hydrogen/oxygen thermal-bubble case