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April 17, 2019, 11:46 |
2D higly underexpanded jet
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#1 |
New Member
Gianmario Ledda
Join Date: Oct 2018
Posts: 6
Rep Power: 8 |
Hi, I work for my master thesis and I must study an higly underexpanded jet due to an accidental release of methane from a pressurized pipe.
I try to work with a 2D geometry but I have different results from 3D to 2D geometry and I don't understand why. In 3d I have a result in according with the theory, meanwhile in 2D I'm not able to reach it. I use Fluent 18.2 I use a convergent nozzle, with a pressure inlet |
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April 17, 2019, 12:11 |
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#2 |
Senior Member
Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
Posts: 5,760
Rep Power: 66 |
What are we looking for?
The nozzle contours are different. Even if the contours are the same, you are doing a 2D slot versus (we can't see it but presumably) a 3D axissymmetric nozzle. Maybe an apples to apples comparison rather than an apples to elephant comparison would be more helpful? |
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April 17, 2019, 12:31 |
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#3 |
New Member
Gianmario Ledda
Join Date: Oct 2018
Posts: 6
Rep Power: 8 |
Tank you for the answer LuckyTran. I already fix the contours of the nozzle and now are the same, but my problem is the same. I have my 3D problem, but because I have a radial simmetry I decide to study the problem in 2D, and according with the theory the result must be the same that I have reached in 3D. So the theory says that I can study my problem in 2D and the velocity field must be similar to 3D image. But I'm not able to do this.
Do you think that I must study also my 2D problem like axissymetric? |
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April 17, 2019, 12:57 |
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#4 |
New Member
Gianmario Ledda
Join Date: Oct 2018
Posts: 6
Rep Power: 8 |
LuckyTran, I understand and solve my problem, thank you so much.
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April 28, 2019, 06:18 |
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#5 |
New Member
akash gupta
Join Date: Apr 2019
Posts: 2
Rep Power: 0 |
Hello
I am working on CD Nozzle (2D Model) simulation in ANSYS Fluent- (real time project). The Inlet conditions are: Pressure =0.6mpa and Temperature = 588.6 k. Expected outlet Temperature is around 350 k. As I am trying to simulate in Fluent, after few iterations, I am getting a reverse flow on pressure inlet and pressure outlet and there is also a reduce in time step due to excess temperature change. How can I resolve these kind of errors that will help me to in the simulation. can you help me plz |
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Tags |
ansys 18.2, fluent 18.2, jet |
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