Supercritical Nitrogen Simulation

Execrabilis · November 9, 2021, 08:40

Hi,
Has anyone done the simulation of injection of nitrogen in supercritical chamber IN FLUENT? I want to do this simulation in Fluent by using the real gas model but am having a hard time setting up the model. The link to the paper is: https://commons.erau.edu/cgi/viewcon...75&context=edt
If someone has done this please help.

My Ansys Fluent settings are:
Pressure Based Solver
Transient
Energy Equation On
LES
SRK Equation of State
Pressure velocity coupling Scheme Coupled
Gradient Node Based
2nd order Accuracy

And boundary conditions being:
Inlet Nitrogen with 5.04 m/s
The outlet of Normal atmospheric pressure
Assigning my cells as 4 MPa pressure

Regards,
Execrabilis

LoGaL · November 9, 2021, 14:55

What is your problem? Setting up SRK is very easy, I don't get the issue, you just choose something different from ideal gas

Execrabilis · November 9, 2021, 23:44

First of all thanks a lot for replying.
I tried running the simulation and my simulation ran fine but when I checked the result there was no density variation and the stream of nitrogen was completely different from what it is in research paper. Then there is the problem that in the research paper he is taking the density of nitrogen at inlet to be different and in the chamber to be different. And should I assign the 4 MPa to the chamber only or the complete domain. The final problem is that of the outlet. I don't know what to assign the outlet as.

You can look at this paper:
https://www.sciencedirect.com/scienc...96844612003075

November 9, 2021, 08:40	Supercritical Nitrogen Simulation	#1
Execrabilis New Member Furqan Ahmed Join Date: Jan 2021 Posts: 2 Rep Power: 0	Hi, Has anyone done the simulation of injection of nitrogen in supercritical chamber IN FLUENT? I want to do this simulation in Fluent by using the real gas model but am having a hard time setting up the model. The link to the paper is: https://commons.erau.edu/cgi/viewcon...75&context=edt If someone has done this please help. My Ansys Fluent settings are: Pressure Based Solver Transient Energy Equation On LES SRK Equation of State Pressure velocity coupling Scheme Coupled Gradient Node Based 2nd order Accuracy And boundary conditions being: Inlet Nitrogen with 5.04 m/s The outlet of Normal atmospheric pressure Assigning my cells as 4 MPa pressure Regards, Execrabilis Last edited by Execrabilis; November 9, 2021 at 10:53.

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November 9, 2021, 14:55		#2
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	What is your problem? Setting up SRK is very easy, I don't get the issue, you just choose something different from ideal gas

November 9, 2021, 23:44		#3
Execrabilis New Member Furqan Ahmed Join Date: Jan 2021 Posts: 2 Rep Power: 0	First of all thanks a lot for replying. I tried running the simulation and my simulation ran fine but when I checked the result there was no density variation and the stream of nitrogen was completely different from what it is in research paper. Then there is the problem that in the research paper he is taking the density of nitrogen at inlet to be different and in the chamber to be different. And should I assign the 4 MPa to the chamber only or the complete domain. The final problem is that of the outlet. I don't know what to assign the outlet as. You can look at this paper: https://www.sciencedirect.com/scienc...96844612003075