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Swirl component for an inlet boundary condition |
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September 2, 2021, 18:02 |
Swirl component for an inlet boundary condition
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#1 |
New Member
John F.
Join Date: Sep 2021
Posts: 2
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Hello,
I am trying to set up a 2D simulation of a swirl burner using a thin slab from the original geometry. To set up my simulation, I would like to add a swirl component for an inlet boundary condition, specifically for the air inlet boundary. Some specifications of my simulation are: it's time-based, and it uses a transient solver, a spray model for the injector, a SAGE combustion model, a LES dynamic structure turbulence model, and a source model for ignition. Does anyone know a way to add a swirl component for an inlet boundary condition? Thank you |
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September 3, 2021, 14:51 |
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#2 |
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Yajuvendra Shekhawat
Join Date: Mar 2017
Location: Convergent Science, Madison WI
Posts: 51
Rep Power: 9 |
Hi,
Unless there is a problem with my understanding of your simulation, this simulation would not be possible in two-dimensions. Swirl burners will have a 3D flow structure to them. Something like rotating in a plane and then translating along the plane normal. If the purpose of running in 2D is to save computational time, then I would suggest you to run a periodic case. I hope this helps. Last edited by Yaju; September 3, 2021 at 16:50. |
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September 3, 2021, 17:26 |
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#3 | |
New Member
John F.
Join Date: Sep 2021
Posts: 2
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Quote:
Hi, I apologize for the miscommunication, my PI used an imprecise language when he explained it to me before posting my question. I am trying to run a simulation using a thin wedge that might approximate 2D to save computational time. How would you suggest that I set it up in a periodic case? Thank you. |
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September 5, 2021, 17:45 |
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#4 |
Member
Yajuvendra Shekhawat
Join Date: Mar 2017
Location: Convergent Science, Madison WI
Posts: 51
Rep Power: 9 |
Hi,
You can refer to one of our engine sector example cases in CONVERGE Studio (File->Load example case -> Internal combustion engines -> Heavy duty diesel) for setting up a periodic case. You will need to make the side/cut surfaces of your wedge as periodic boundaries. Please refer to the boundary setup to see how to define the periodic boundaries. If you are a new user. I will recommend you to attend our online training using your universities credentials (https://convergecfd.com/training). These training sessions are free. |
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September 7, 2021, 14:09 |
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#5 | |
New Member
Noah Van Dam
Join Date: Sep 2021
Posts: 1
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Hi,
I am John's academic advisor and working with him on this problem. Quote:
Looking at that example it appears the Pilot inlet uses a file to define the inlet velocity, and the profile type says spatial rather than temporal, so it would seem to be specifying a velocity profile as a function of position. The Flame D case has no swirl, but it would seem we could use this approach to add a swirl component to our inlet, assuming I am interpreting the given information correctly. The coordinate system will still always be cartesian, correct? Our velocity components would be constant in cylindrical coordinates, but I don't see any option to use a cylindrical coordinate system to specify the velocity coordinates. Prof. Van Dam |
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September 7, 2021, 14:30 |
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#6 |
Member
Yajuvendra Shekhawat
Join Date: Mar 2017
Location: Convergent Science, Madison WI
Posts: 51
Rep Power: 9 |
Hi,
As you mentioned, a spatial file can be used to specify the swirl inlet flow conditions. The spatial location and velocity components all have to be specified in the cartesian co-ordinate system. So, you will have to modify the velocity from cylindrical to cartesian system. |
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Tags |
2d simulation, boundary condition, swirl, swirl burner |
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