title: Improved steady-state diffusion approximation with an anisotropic point source and the delta-Eddington phase function.
abstract: Using the algebra transformation method, we develop and demonstrate the use of the delta-P(1) approximation to improve steady-state radiative-transfer estimates on spatial scales comparable to the mean free path. We show that the delta-P(1) approximation agrees well with Monte Carlo simulation from source to infinity when we choose an appropriate parameter f (fractional portion that scatters directly forward) in the delta-Eddington phase function. We also provide the empirical formula to determine the parameter f.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, China.
authors.forename: Chenggang
authors.initials: C
authors.lastname: Chai
authors.forename: Yaqin
authors.initials: Y
authors.lastname: Chen
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Li
authors.forename: Qingming
authors.initials: Q
authors.lastname: Luo