How to implement hydrogen combustion?

lpelizzari · August 31, 2022, 18:06

I just want a BC injecting Hydrogen (H2) and have it combust with air (0.78N2 + 0.22O2) inside the domain, and the output should be N2, O2 and H2O, simple as that. There's no ignition, hopefully the air temperature (>1000K) should take care of that.

The Fluent tutorial (https://www.afs.enea.it/project/nept...ug/node537.htm) has proven unfruitful so far. It behaves like I'm just injecting more air into the domain.

Should I use the premixed or non-premixed model? It seems to be non-premixed, because, intuitively, premixed sounds like what you would have in a reciprocating engine.

What else can I do?

AlexanderZ · August 31, 2022, 19:59

increase temperature locally in the beggining of simulation

lpelizzari · August 31, 2022, 21:31

Quote:

Originally Posted by AlexanderZ

increase temperature locally in the beggining of simulation

How so? Can you be more specific?

ChaoLW · September 1, 2022, 04:35

You can patch high temperature (2000K) and high intermediates and product mass concentration in the initial filed.
In your case, the non-premixed model seems more accurate.

AlexanderZ · September 6, 2022, 02:52

press initialize, then PATCH option will be avaliable

August 31, 2022, 18:06	How to implement hydrogen combustion?	#1
lpelizzari New Member Lucas Pelizzari Join Date: Jun 2022 Posts: 8 Rep Power: 4	I just want a BC injecting Hydrogen (H2) and have it combust with air (0.78N2 + 0.22O2) inside the domain, and the output should be N2, O2 and H2O, simple as that. There's no ignition, hopefully the air temperature (>1000K) should take care of that. The Fluent tutorial (https://www.afs.enea.it/project/nept...ug/node537.htm) has proven unfruitful so far. It behaves like I'm just injecting more air into the domain. Should I use the premixed or non-premixed model? It seems to be non-premixed, because, intuitively, premixed sounds like what you would have in a reciprocating engine. What else can I do?

August 31, 2022, 19:59		#2
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	increase temperature locally in the beggining of simulation __________________ best regards ****************************** press LIKE if this message was helpful

September 6, 2022, 02:52		#5
AlexanderZ Senior Member Alexander Join Date: Apr 2013 Posts: 2,363 Rep Power: 34	press initialize, then PATCH option will be avaliable __________________ best regards ****************************** press LIKE if this message was helpful

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September 1, 2022, 04:35		#4
ChaoLW New Member Liu Wenchao Join Date: Jan 2021 Posts: 15 Rep Power: 5	You can patch high temperature (2000K) and high intermediates and product mass concentration in the initial filed. In your case, the non-premixed model seems more accurate.