In this episode of fire fundamentals we sit down with Professor Simo Hostikka from Aalto University to cover radiation in fires, both from the angle of physical phenomena and ways to model it. In this episode we cover following topics:
feel less mysterious, from blackbody basics and role of radiation actually does inside the CFD N-S equation.
Spectrum and emissivity to real engineering outcomes like heat flux, tenability
Radiation’s two roles in fire CFD: target heat flux and the gas energy source term
Emission versus absorption and why Kirchhoff’s law is spectral, not just a single number
Spectrum intuition using Planck, Wien’s law, and why T to the fourth explodes heat flux
View factors as a hazard mental model for layers, panels, and distance effects
Why gases are strongly non-gray while soot often looks smooth and easier to approximate
How FDS uses the finite angle method, why 104 directions exists, and how updates are staged in time, how to manage spatial and temporal resolution of the radiation
Ray effect and numerical diffusion, when you can see the error and when you cannot
Other radiation models such as Monte Carlo, and when they are worth it.
---- The Fire Science Show is produced by the Fire Science Media in collaboration with OFR Consultants. Thank you to the podcast sponsor for their continuous support towards our mission.
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