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-   -   Mixing AIR and METHANE (http://www.cfd-online.com/Forums/fluent/73067-mixing-air-methane.html)

zalho February 25, 2010 13:56

Mixing AIR and METHANE
 
Hi.

What is the procedure to simulate the mixing of these two gases without having any reaction??

Is using the Species Model : Species Transport?
Using Multiphase Model?

Help!!!!! :confused:

coalgas February 25, 2010 20:38

i pretty sure, you dont have to use multiphase model. As both species are in gaseous phase. With 'species transport', you can study diffusion by turning off reactions. But you have to careful about the properties, diffusivity.
Again, consider practicality of the problem, like H2/O2 mixture you can not just mix it as there are chances of deflagration (or may be detonation) with minute addition of energy. in such case you need to turn on 'reactions'

zalho March 1, 2010 09:55

Quote:

Originally Posted by coalgas (Post 247525)
i pretty sure, you dont have to use multiphase model. As both species are in gaseous phase. With 'species transport', you can study diffusion by turning off reactions. But you have to careful about the properties, diffusivity.
Again, consider practicality of the problem, like H2/O2 mixture you can not just mix it as there are chances of deflagration (or may be detonation) with minute addition of energy. in such case you need to turn on 'reactions'

thanks :cool:

i used the species transport and turned off the reactions and i did'it :)
now i can obtain the contours of the concentration of the gas

:D

ariudin February 12, 2013 20:57

when you using this method, are you turn off species equation?or you just turn off volumetric reaction and turn on species equation?
i had similar problem with you, and i'm very appreciated if you answer my question

msaeedsadeghi February 13, 2013 00:49

Quote:

Originally Posted by ariudin (Post 407523)
when you using this method, are you turn off species equation?or you just turn off volumetric reaction and turn on species equation?
i had similar problem with you, and i'm very appreciated if you answer my question

Yes, there is no need to enable volumetric. By disabling it no reaction takes place, but species can mix together.

ariudin February 14, 2013 22:52

thanks for your answer
yes i did disable volumetric, but should i do disable species equation on solution by turn off this option?


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