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Improved Discrete Ordinates Method for Ray Effects Mitigation

[+] Author Affiliations
Zhi-Feng Huang

Huazhong University of Science and Technology, Wuhan, China; Florida Institute of Technology, Melbourne, FL

Huai-Chun Zhou

Huazhong University of Science and Technology, Wuhan, China

Pei-feng Hsu

Florida Institute of Technology, Melbourne, FL

Paper No. IMECE2009-10471, pp. 89-97; 9 pages
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 3: Combustion Science and Engineering
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4376-5 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME


A new and improved method based on the discrete ordinates scheme with infinitely small weights (DOS+ISW) is developed for radiative heat transfer in three-dimensional participating media. To demonstrate the effectiveness of the method, ray effects caused by 1) abrupt step changes in the boundary conditions and 2) the stepwise variation of the medium emissive power are discussed. 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. 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 ordinates directions used in the new method becomes computationally prohibitive in discrete ordinates method due to the increased computer memory and computation time requirements.

Copyright © 2009 by ASME



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