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May 26, 2019, 04:49 |
Mixture Fraction Formulation
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#1 |
New Member
Amit Makhija
Join Date: Apr 2018
Posts: 11
Rep Power: 8 |
How to implement mixture fraction formulation in reactingFoam?
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July 23, 2019, 16:43 |
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#2 |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
I calculate mixture fraction using Bilger's formula in OpenFOAM 2.3.x, as here:
https://github.com/adhiraj-dasgupta/...ixtureFraction Maybe you can use this utility as a guide? |
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July 24, 2019, 00:39 |
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#3 |
New Member
Amit Makhija
Join Date: Apr 2018
Posts: 11
Rep Power: 8 |
Dear Adhiraj
First of all thanks for the reply and the code. I have implemented the mixture fraction formulation onto OpenFOAM code. But now I want to add the conserved equation of the mixture fraction in the code, can you help me for that? |
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July 24, 2019, 10:50 |
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#4 |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
It should be easy top add an equation for mixture fraction (just a passive scalar), unless I am missing something.
Can you provide more details about what you are trying to implement, and if you are running into any errors? |
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July 25, 2019, 00:04 |
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#5 |
New Member
Amit Makhija
Join Date: Apr 2018
Posts: 11
Rep Power: 8 |
I want to add this particular conserved mixture fraction equation (without closing term) by replacing the species conservation equation.
https://drive.google.com/file/d/1BON...Q4Zyrtvff/view |
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July 25, 2019, 11:26 |
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#6 |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
This looks straightforward to implement. What errors did you get?
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July 26, 2019, 00:17 |
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#7 | |
New Member
Amit Makhija
Join Date: Apr 2018
Posts: 11
Rep Power: 8 |
Quote:
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July 26, 2019, 10:57 |
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#8 |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
There are tutorials available to add an equation for a scalar in OpenFOAM. For example, see here:
https://openfoamwiki.net/index.php/H...perature_field Study this and then adapt it to your needs. |
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July 27, 2019, 00:38 |
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#9 |
New Member
Amit Makhija
Join Date: Apr 2018
Posts: 11
Rep Power: 8 |
I will try
Thanks. |
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January 9, 2020, 07:37 |
applicable for premixed ch4/air combustion?
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#10 |
New Member
Join Date: Jan 2017
Posts: 6
Rep Power: 9 |
Hi Adhiraj
Thank you for your utility. I adapted your code for OF-5.x, as attached. What if I am considering premixed ch4/air combustion? How must the fuel and oxidizer species be set in the dictionary? Thanks, Aurore |
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January 10, 2020, 11:18 |
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#11 |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
Does mixture fraction make sense for premixed flames?
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January 11, 2020, 05:43 |
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#12 |
Member
Utkan Caliskan
Join Date: Aug 2014
Posts: 42
Rep Power: 11 |
There is a patch contribution of mixture fraction functionObject by a user in the issue tracking system of openfoam.org.
https://bugs.openfoam.org/view.php?id=3411 |
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January 14, 2020, 09:28 |
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#13 |
New Member
Join Date: Jan 2017
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My initial idea was to qualitatively visualize the phase boundary between unburnt and burnt gaseous phase by the mixture fraction, as you proposed.
As expected, the utility calculates a more less uniform distribution in the combustion chamber. Anyway, using the simple relationship Zst = 1/(1+phi) (phi denotes a local equivalence ratio) provided a proper estimation. Thanks. Aurore. |
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January 14, 2020, 11:57 |
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#14 | |
Senior Member
Adhiraj
Join Date: Sep 2010
Location: Karnataka, India
Posts: 187
Rep Power: 15 |
Quote:
Also, how can mixture fraction determine whether the point is on the burnt-gas side or the fresh gas side? Isn't that the role of progress variable? |
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January 15, 2020, 07:31 |
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#15 | |
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Quote:
Progress variable is a good spot. |
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December 15, 2020, 05:11 |
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#16 |
Senior Member
Herpes Free Engineer
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