  Let S be a closed, connected, orientable surface of genus at least 2, and let
C(S) denote the deformation space of convex real projective structures S. In
this article, we introduce two new flows on C(S), which we call the internal
bulging flow and the eruption flow. These are geometrically defined flows
associated to each pair of pants in a pants decomposition on S that deform the
internal parameters. We show that the eruption flows, together with the
generalized twist flows about the pants curves, give rise to a half-dimensional
family of commuting flows on C(S).
