A fast spectral approximation of narrowband model for thermal radiation calculation
(2004) In Numerical Heat Transfer Part B: Fundamentals 46(2). p.165178 Abstract
 A fast spectral approximation of a narrowband computer model is proposed for prediction of thermal radiation in a generally nonisothermal and nonhomogeneous combustion environment. The approximation is made by assuming each discretized spatial element along a line of sight to be locally "gray" within each small narrowband spectrum interval. For each spatial element, the local equivalent spectral absorption coefficient of the combustion products, including carbon dioxide, water vapor, and soot, is calculated based on formulas from the narrowband model. Compared with the previously developed fast narrowband model, FASTNB, which is an order of magnitude faster and gives almost exactly the same result as Grosshandler's original narrowband... (More)
 A fast spectral approximation of a narrowband computer model is proposed for prediction of thermal radiation in a generally nonisothermal and nonhomogeneous combustion environment. The approximation is made by assuming each discretized spatial element along a line of sight to be locally "gray" within each small narrowband spectrum interval. For each spatial element, the local equivalent spectral absorption coefficient of the combustion products, including carbon dioxide, water vapor, and soot, is calculated based on formulas from the narrowband model. Compared with the previously developed fast narrowband model, FASTNB, which is an order of magnitude faster and gives almost exactly the same result as Grosshandler's original narrowband model RADCAL, this approximation method provides calculation result with small deviation at substantially faster speed. Furthermore, the speedup ratio increases linearly with the number of discretized spatial elements along a line of sight. This makes this approximation method particularly useful in computational combustion, where the grid number used in computation is steadily becoming larger and larger as the computation goes toward large eddy simulation (LES) and direct numerical simulation (DNS). (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/272736
 author
 Yan, Zhenghua ^{LU}
 organization
 publishing date
 2004
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Numerical Heat Transfer Part B: Fundamentals
 volume
 46
 issue
 2
 pages
 165  178
 publisher
 Taylor & Francis
 external identifiers

 wos:000222637400004
 scopus:3142690458
 ISSN
 10407790
 DOI
 10.1080/10407790490438473
 language
 English
 LU publication?
 yes
 id
 39c654a29ef34d938fe222aad2df0112 (old id 272736)
 date added to LUP
 20071107 08:06:38
 date last changed
 20180107 08:59:07
@article{39c654a29ef34d938fe222aad2df0112, abstract = {A fast spectral approximation of a narrowband computer model is proposed for prediction of thermal radiation in a generally nonisothermal and nonhomogeneous combustion environment. The approximation is made by assuming each discretized spatial element along a line of sight to be locally "gray" within each small narrowband spectrum interval. For each spatial element, the local equivalent spectral absorption coefficient of the combustion products, including carbon dioxide, water vapor, and soot, is calculated based on formulas from the narrowband model. Compared with the previously developed fast narrowband model, FASTNB, which is an order of magnitude faster and gives almost exactly the same result as Grosshandler's original narrowband model RADCAL, this approximation method provides calculation result with small deviation at substantially faster speed. Furthermore, the speedup ratio increases linearly with the number of discretized spatial elements along a line of sight. This makes this approximation method particularly useful in computational combustion, where the grid number used in computation is steadily becoming larger and larger as the computation goes toward large eddy simulation (LES) and direct numerical simulation (DNS).}, author = {Yan, Zhenghua}, issn = {10407790}, language = {eng}, number = {2}, pages = {165178}, publisher = {Taylor & Francis}, series = {Numerical Heat Transfer Part B: Fundamentals}, title = {A fast spectral approximation of narrowband model for thermal radiation calculation}, url = {http://dx.doi.org/10.1080/10407790490438473}, volume = {46}, year = {2004}, }