High-Order Isogeometric Methods for Compressible Flows. II. Compressible Euler Equations

Abstract

This work extends the high-resolution isogeometric analysis approach established in [1] to the equations of gas dynamics. The group finite element formulation is adopted to obtain an efficient assembly procedure for the standard Galerkin approximation, which is stabilized by adding artificial viscosities proportional to the spectral radius of the Roe-averaged flux-Jacobian matrix. Excess stabilization is removed in regions with smooth flow profiles with the aid of algebraic flux correction [2]. The underlying principles are reviewed and it is shown that linearized FCT-type flux limiting [3] originally derived for nodal low-order finite elements ensures positivity-preservation for high-order B-Spline discretizations.