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【正文】 served. April 28, 2022 Inventory 002598 Training Manual ?The P1 Model – Assumptions: ? Radiation intensity is isotropic or direction independent at a given location in space – Method: ? An additional transport equation is solved – Limitations: ? Only valid for optical thickness/depth greater than 1. ? Not valid for transparent walls ? Needs boundary conditions on all external surfaces – Benefits: ? Valid for nonblack surfaces, nonconstant properties, anisotropic scattering, and near walls ? Example: pulverized fuel flames (in regions away from the immediate vicinity of the flame) P1 Model Radiation Modeling C7 ANSYS, Inc. Proprietary 169。 2022 ANSYS, Inc. All rights reserved. April 28, 2022 Inventory 002598 Training Manual ?Several radiation models are available which provide approximate solutions to the RTE ?Each radiation model has its assumptions, limitations, and benefits 1) Rosseland Model (Diffusion Approximation Model) 2) P1 Model (Gibb’s Model/Spherical Harmonics Model) 3) D
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