Asymptotic PN Approximation in Radiative Transfer Problems

Re’em Harel, Stanislav Burov, Shay I. Heizler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We study the validity of the time-dependent asymptotic PN approximation in radiative transfer of photons. The time-dependent asymptotic PN is an approximation which uses the standard PN equations with a closure that is based on the asymptotic solution of the exact Boltzmann equation for a homogeneous problem, in space and time. The asymptotic PN approximation for radiative transfer requires careful treatment regarding the closure equation. Specifically, the mean number of particles that are emitted per collision ((Formula presented.)) can be larger than one due to inner or outer radiation sources and the coefficients of the closure must be extended for these cases. Our approximation is tested against a well-known radiative transfer benchmark. It yields excellent results, with almost correct particle velocity that controls the radiative heat-wave fronts.

Original languageAmerican English
Pages (from-to)390-406
Number of pages17
JournalJournal of Computational and Theoretical Transport
Issue number5
StatePublished - 2021

Bibliographical note

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© 2020 Taylor & Francis Group, LLC.


  • Radiative transfer
  • Su–Olson benchmark
  • asymptotic P approximation


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