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April 7, 2016, 09:09 |
Transport model
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#1 |
Member
AdOo
Join Date: Mar 2016
Location: Bordeaux
Posts: 91
Rep Power: 10 |
Hi all,
I'm facing with the eternal problem of transport model... I said "eternal" because before posting this thread, I was looking on many older posts which has been unsolved for years now. Like most of the older post, I was initially looking for some As and Ts coefficient, in order to run reactingFoam (without reaction) using the Sutherland model (used in the counterFlowFlame2D OpenFOAM exemple). The thing is:
Adrien |
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April 7, 2016, 12:18 |
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#2 |
Member
AdOo
Join Date: Mar 2016
Location: Bordeaux
Posts: 91
Rep Power: 10 |
According https://openfoamwiki.net/index.php/Contrib/Janaf :
" In OpenFOAM the same reader, which reads the thermodynamic data of the janaf table also contains the input data of the laminar viscosity. Therefor the Sutherland formula is used, which shows a linear increasing of the viscosity depending on the temperature. The input data is hard coded and describes the temperature dependent viscosity of pure nitrogen. In a case with nitrogen as environmental gas this could be an acceptable approximation, if there are no ionization processes. " and " For temperatures above 10000 K the Sutherland formula is not a good approximation anymore. The beginning ionization leads to an decreasing of the laminar viscostiy. Therefor a transport model based on polynomials should be used instead. " The question of the ability to find the Sutherland coefficients and temperatures is then still topical for those who trust on this model. |
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