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【正文】 . 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) Discrete Transfer Model (Shah Model) 4) Monte Carlo Model (not available with the ANSYS CFDFlo product) Radiation Models Radiation Modeling C5 ANSYS, Inc. Proprietary 169。 2022 ANSYS, Inc. All rights reserved. April 28, 2022 Inventory 002598 Training Manual ?The Rosseland Model – Method: ? A new diffusion term is added to the energy equation – Limitations: ? Only valid for optically thick and linearly anisotropic material (thickness/depth greater than 10) ? Not valid near walls – Benefits: ? Does not require any boundary conditions since surfaces are treated as black (Emissivity = ) – Examples: ? Heat transfer through hot glass ? Heat transfer through semitransparent material
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