کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5430920 1397427 2007 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Angularly adaptive P1-double P0 flux-limited diffusion solutions of non-equilibrium grey radiative transfer problems
موضوعات مرتبط
مهندسی و علوم پایه شیمی طیف سنجی
پیش نمایش صفحه اول مقاله
Angularly adaptive P1-double P0 flux-limited diffusion solutions of non-equilibrium grey radiative transfer problems
چکیده انگلیسی

The double spherical harmonics angular approximation in the lowest order, i.e. double P0 (DP0), is developed for the solution of time-dependent non-equilibrium grey radiative transfer problems in planar geometry. Although the DP0 diffusion approximation is expected to be less accurate than the P1 diffusion approximation at and near thermodynamic equilibrium, the DP0 angular approximation can more accurately capture the complicated angular dependence near a non-equilibrium radiation wave front. In addition, the DP0 approximation should be more accurate in non-equilibrium optically thin regions where the positive and negative angular domains are largely decoupled. We develop an adaptive angular technique that locally uses either the DP0 or P1 flux-limited diffusion approximation depending on the degree to which the radiation and material fields are in thermodynamic equilibrium. Numerical results are presented for two test problems due to Su and Olson and to Ganapol and Pomraning for which semi-analytic transport solutions exist. These numerical results demonstrate that the adaptive P1-DP0 diffusion approximation can yield improvements in accuracy over the standard P1 diffusion approximation, both without and with flux-limiting, for non-equilibrium grey radiative transfer.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 104, Issue 1, March 2007, Pages 116-132
نویسندگان
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