We prove a priori estimates for the three-dimensional compressible Euler equations with moving physical vacuum boundary, with an equation of state given by p(ρ) = Cγργ for γ > 1. The vacuum condition necessitates the vanishing of the pressure, and hence density, on the dynamic boundary, which creates a degenerate and characteristic hyperbolic free-boundary system to which standard methods of symmetrizable hyperbolic equations cannot be applied.
机构:
Jiangxi Normal Univ, Sch Math & Stat, Nanchang 330022, Peoples R China
Jiangxi Normal Univ, Jiangxi Prov Ctr Appl Math, Nanchang 330022, Peoples R ChinaJiangxi Normal Univ, Sch Math & Stat, Nanchang 330022, Peoples R China
机构:
Admiral Makarov State University of Maritime and Inland Shipping, 5/7, Dvinskaya St., St. PetersburgAdmiral Makarov State University of Maritime and Inland Shipping, 5/7, Dvinskaya St., St. Petersburg