Improved discrete ordinates method for ray effects mitigation / Zhi-Feng Huang in Journal of heat transfer, Vol. 133 N° 4 (Avril 2011)  

Public ISBD [article]  inJournal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [044502/1-5] Titre : Improved discrete ordinates method for ray effects mitigation Type de document : texte imprimé Auteurs : Zhi-Feng Huang, Auteur ; Huai-Chun Zhou, Auteur ; Pei-feng Hsu, Auteur Année de publication : 2011 Article en page(s) : pp. [044502/1-5] Note générale : Physique Langues : Anglais (eng) Mots-clés : Radiative transfer Three dimensional Ray effects Isotropic scattering Discrete ordinates method Index. décimale : 536 Chaleur. Thermodynamique Résumé : A new and improved method based on the concept of discrete ordinates scheme with infinitely small weights (DOS+ISW) is developed for modeling radiative heat transfer in three-dimensional participating media. To demonstrate the effectiveness of the method in mitigating ray effects, the ray effects caused by (1) abrupt step changes in the boundary conditions and (2) the stepwise variation of the medium emissive power are considered. In this work, angular quadrature sets with large number of discrete ordinate directions are chosen to mitigate ray effects while at the same time keeping the computational time increase to a minimum. Comparing with the conventional discrete ordinates method, the difference is that intensities in these directions are calculated by DOS+ISW method. Intensity with fine directional resolution calculated by this method is validated by comparing with that of reverse Monte Carlo method. The large number of discrete ordinate directions used in the new method becomes computationally prohibitive in the conventional discrete ordinates method due to the increased computer memory and computation time requirements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...] [article] Improved discrete ordinates method for ray effects mitigation [texte imprimé] / Zhi-Feng Huang, Auteur ; Huai-Chun Zhou, Auteur ; Pei-feng Hsu, Auteur . - 2011 . - pp. [044502/1-5]. Physique Langues : Anglais (eng) in Journal of heat transfer > Vol. 133 N° 4 (Avril 2011) . - pp. [044502/1-5] Mots-clés : Radiative transfer Three dimensional Ray effects Isotropic scattering Discrete ordinates method Index. décimale : 536 Chaleur. Thermodynamique Résumé : A new and improved method based on the concept of discrete ordinates scheme with infinitely small weights (DOS+ISW) is developed for modeling radiative heat transfer in three-dimensional participating media. To demonstrate the effectiveness of the method in mitigating ray effects, the ray effects caused by (1) abrupt step changes in the boundary conditions and (2) the stepwise variation of the medium emissive power are considered. In this work, angular quadrature sets with large number of discrete ordinate directions are chosen to mitigate ray effects while at the same time keeping the computational time increase to a minimum. Comparing with the conventional discrete ordinates method, the difference is that intensities in these directions are calculated by DOS+ISW method. Intensity with fine directional resolution calculated by this method is validated by comparing with that of reverse Monte Carlo method. The large number of discrete ordinate directions used in the new method becomes computationally prohibitive in the conventional discrete ordinates method due to the increased computer memory and computation time requirements. DEWEY : 536 ISSN : 0022-1481 En ligne : http://asmedl.aip.org/vsearch/servlet/VerityServlet?KEY=JHTRAO&smode=strresults& [...]

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