3 papers
physics.comp-ph2012
Perturbed, Entropy-Based Closure for Radiative Transfer
Martin Frank, Cory D. Hauck, Edgar Olbrant
We derive a hierarchy of closures based on perturbations of well-known entropy-based closures; we therefore refer to them as perturbed entropy-based models. Our derivation reveals…
physics.comp-ph2012
Asymptotic Derivation and Numerical Investigation of Time-Dependent Simplified Pn Equations
E. Olbrant, E. W. Larsen, M. Frank +1
The steady-state simplified Pn (SPn) approximations to the linear Boltzmann equation have been proven to be asymptotically higher-order corrections to the diffusion equation in cer…
physics.med-ph2009
Application of Generalized Fokker-Planck Theory To Electron And Photon Transport In Tissue
Edgar Olbrant, Martin Frank
We study a deterministic method for particle transport in tissue in selected medical applications. Generalized Fokker-Planck (GFP) theory has been developed to improve the Fokker-P…