Studies in Application of Discrete Ordinates Transport Methods to Light Transport Calculations: Preparation of Mie Theory Cross Sections In Legendre Polynomials.
RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX
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A study was performed to determine the applicability of discrete ordinates codes to the transport of light through particulates. Light is scattered with high anisotropy by particulates. This high anisotropy requires expansion in high Legendre order for accurate expression by discrete ordinates codes. Procedures for convenient and economical production of light scattering data Mie theory in discrete ordinates format were developed and tested. One-dimensional time-dependent discrete ordinates calculations were performed using the TDA Time Dependent ANISN code with a simple cloud model. Computer storage and time limitations are outlined. Extension to largest particle sizes and a second space dimension can best be accomplished using asymmetric discrete angle sets to conserve computer resources. Further economies might be accomplished by normalization of low-order data for problems dominated by multiple scattering. Relaxation of the need to express data in Legendre series could offer further economy, but may require significant development. Author