A RADIATION-GASDYNAMICAL METHOD FOR NUMERICAL SIMULATIONS OF IONIZED NEBULAE - RADIATION-GASDYNAMICS OF PNE-I

We present a numerical method to combine radiation processes for diffu se gaseous nebulae with numerical gasdynamic methods. The method encom passes detailed calculations of the ionization, heating, and cooling p rocesses. We have constructed two codes based on different gasdynamic numerical methods: FCT/LCD and a Roe Solver, We apply the two new radi ation-gasdynamics codes to the interacting winds model for the formati on of planetary nebulae and compare the new results to the non-radiati ve results.