species transport and non premixed model

Weiqiang Liu · June 22, 2020, 04:32

Hi all,

recently, I read a paper related to methane air combustion simulation with fluent. I can upload picture on CFD forum. Therefore, I can just describe the geometry here.

Air and pure methane just enters computation domain throug different inlets. The author used species transport model in fluent. However, I read fluent user guide and know that species transport model is used to model molecular level mixing of species. In this case, it's obviously not a molecular level mixing according to my understanding. I am wondering why the author used species transport model instead of non premixed model.

Best regards

Weiqiang

vinerm · June 22, 2020, 04:43

Gases always mix at molecular level until there is some mechanism present or employed to keep them separated.

Weiqiang Liu · June 22, 2020, 08:15

Quote:

Originally Posted by vinerm

Gases always mix at molecular level until there is some mechanism present or employed to keep them separated.

yes, I get it. Thanks

June 22, 2020, 04:32	species transport and non premixed model	#1
Weiqiang Liu Senior Member Weiqiang Liu Join Date: Feb 2018 Posts: 278 Rep Power: 9	Hi all, recently, I read a paper related to methane air combustion simulation with fluent. I can upload picture on CFD forum. Therefore, I can just describe the geometry here. Air and pure methane just enters computation domain throug different inlets. The author used species transport model in fluent. However, I read fluent user guide and know that species transport model is used to model molecular level mixing of species. In this case, it's obviously not a molecular level mixing according to my understanding. I am wondering why the author used species transport model instead of non premixed model. Best regards Weiqiang

June 22, 2020, 04:43	Mixing	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	Gases always mix at molecular level until there is some mechanism present or employed to keep them separated. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.