Hyperbolicity and critical points in two-moment approximate radiative transfer.

Abstract

We present numerical calculations of spherically symmetricradiativetransportusingatwo-moment(P-1)method with a two-dimensional non-linear closure on the Eddington factor. The stationary state solutions contain a critical point. We demonstrate that the two-moment equations with a non-linear closure are well behaved. The solutions are physically accept- able, regular and accurate.