RADIATION TRANSPORT CALCULATION IN HIGH ENTHALPY ENVIRONMENTS FOR 2-DIMENSIONAL AXISYMMETRICAL GEOMETRIES

A Monte Carlo method to determine radiative source terms and boundary heat fluxes for generic, two-dimensional axisymmetric geometries was d eveloped. For the geometrical discretization, curvilinear structured g rids have to be used. Thus, it is possible to use essentially the same grid as for the initial flowfield computation. The spectral behavior of gas radiation was considered as well as thermochemical nonequilibri um conditions of the medium using the NEQAIR code system. The radiatio n process is simulated by a large number of energy-carrying bundles em itted at the appropriate locations, having the appropriate wavelength and direction of emission. These bundles are then traced on their path through the computational domain and their spectral absorption behavi or is calculated. Departing from a given flowfield solution for the co nsidered geometry, the radiation simulation method is initiated and yi elds the radiative source terms in an adequate form for coupling with the energy equations of the flowfield. The iteration is performed in a loosely coupled manner. A first radiation assessment for the case of a trajectory point of the ROSETTA-re-entry is presented.