How can I inject N2 into air?

Roh · March 18, 2018, 00:40

Guys
I'm trying to inject N2 into air using a nozzle. here is a sketch of my domain.

At nozzle inlet, we are suppossed to inject N2 into air as the ambient fluid. How can I do this?

e_cfd · March 19, 2018, 03:32

I think you can use Species model and define a mixture of N2 and air then at the inlet you can define the mass fraction of N2.

Roh · March 19, 2018, 05:43

Quote:

Originally Posted by e_cfd

I think you can use Species model and define a mixture of N2 and air then at the inlet you can define the mass fraction of N2.

Good idea, I was thinking about it and tried it but "Species" tab is not enable in the boundary condition. here is a screenshot of my setting:

e_cfd · March 19, 2018, 05:51

Dear Roh,

I suggest you read the tutorial for the species model and everything would be clear to you. However, if you active the species model you have to go to the material and there you have to choose N2 and air as the mixture components (N2 should be the first component!!). Then you can go to the boundary conditions and from the species tab of the inlet boundary condition, you would be able to assign proper values to the mass fraction of each species.

If the species tab is not active, check the cell zone. you have to change the fluid to the mixture.
I hope it helps.

Roh · March 19, 2018, 06:44

Thank you.
It's enabled, now. Going for a run. god bless you

March 19, 2018, 05:51		#4
e_cfd Member ehsan Join Date: Sep 2014 Posts: 38 Rep Power: 11	Dear Roh, I suggest you read the tutorial for the species model and everything would be clear to you. However, if you active the species model you have to go to the material and there you have to choose N2 and air as the mixture components (N2 should be the first component!!). Then you can go to the boundary conditions and from the species tab of the inlet boundary condition, you would be able to assign proper values to the mass fraction of each species. If the species tab is not active, check the cell zone. you have to change the fluid to the mixture. I hope it helps. Roh likes this.

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March 19, 2018, 03:32		#2
e_cfd Member ehsan Join Date: Sep 2014 Posts: 38 Rep Power: 11	I think you can use Species model and define a mixture of N2 and air then at the inlet you can define the mass fraction of N2.

March 19, 2018, 06:44		#5
Roh Senior Member Join Date: Sep 2017 Posts: 130 Rep Power: 8	Thank you. It's enabled, now. Going for a run. god bless you