Thanks very much for sharing your experience. But how can not I even ignite the mixture with gas phase mechanism.ħ. I know if I include gas phase mechanism, much more transport equations and reaction schemes must be solved by fluent, which causes slower iteration speed. Logically, results should have no difference with and without gas phase mechanism if gas phase reactions are not important. Besides, iteration speed becomes much slower. However, when I include gas phase mechanism like GRI3.0 in my model, convergence becomes very hard to achieve and mixture can not be ignited.
I also read some literature which claim that gas phase reactions are very important and can not be ignored. Have you reproduced the results of the literature you recommended to me exactly the same?Ħ.
#Thermo chemkin format manual#
I looked up chemkin user manual and found that normally there are 7 coefficients for the upper temperature. the former has 14 fitting coefficients and the latter has 15 fitting coefficients. one is from GRI 3.0 thermo data and the other is from n-dodecane thermo developed by Hai Wang. However, if I change the calculating method to ideal gas mixing law or mass weighted average, The calculated results would be very different with the literature or can not even be ignited.ĥ. Hi all, I have two thermo data file at hand. If I use default value of thermo and transport in fluent data base and do not do any modification to the material panel, viscosity and conductivity in material panel are constant value by default. How do you define the mixture viscosity and conductivity in material panel of fluent. I don't activate any radiation part in my model.Ĥ. So you have solid wall computation domain in your model? As far as I am concerned, there is no solid geometry in the literature model you recommended.ģ. I don't know why.Ģ.You said you set the platinum surface to 'coupled'.
The thermodynamic data are given in the Chemkin compatible format. However, I can not ignite the mixture when thermo and transport data are imported by chemkin files. igniting chemical states), heat release, and realistic thermo-chemical properties. Therefore, if I want to reproduce their results exactly, all the setups should be the same, right? Besides, I can get similar results of the literature you recommended with default thermodynamic and transport data from fluent database. I want to use my own thermo and transport data because a lot of literature just claim that they use external subroutines to calculate thermodynamic and transport instead of fluent database.
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