A fast, exact code for scattered thermal radiation compared with a two-stream approximation

Statistics – Computation

Scientific paper

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Codes, Computational Fluid Dynamics, Computerized Simulation, Radiative Transfer, Thermal Radiation, Angular Distribution, Approximation, Optical Thickness, Zenith

Scientific paper

A two-stream accuracy study for internally (thermal) driven problems is presented by comparison with a recently developed 'exact' adding/doubling method. The resulting errors in external (or boundary) radiative intensity and flux are usually larger than those for the externally driven problems and vary substantially with the radiative parameters. Error predictions for a specific problem are difficult. An unexpected result is that the exact method is computationally as fast as the two-stream approximation for nonisothermal media.

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