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Eddy formation in laminar flame combustion.

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Old   July 16, 2019, 04:02
Default Eddy formation in laminar flame combustion.
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Etienne
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Hi everyone,

I've recently started working with reactive flow under Star-CCM+ and I would like some advice regarding my simulation.

I'm trying to compute the laminar combustion of a premixed N2O/CH4 mixture over a cylindrical burner. To do so, I'm using an axisymetric model wtih Complex chemistry (GriMech 3.0) Laminar flame concept, laminar flow and premixed combustion models.

When setting the velocity to a low value (1 m.s-1) the simulation works fine but I'm facing a problem with higher velocity (2 m.s-1).

As expected, the "root of the flame" starts to be V-shaped but the velocity and reacting zone are orthogonal causing my flame to deviate sideway wich leads to the apparition of large eddy inside the flame.


https://ibb.co/TmSMzV3

https://ibb.co/Z8jnyBm

Is the velocity close to the reacting zone supposed to look like that ? (It really seems un-physical to me)
Do you have any tip to make my laminar flame more laminar ?

I already tried numerous different meshes, different geometry (with or without the burner as a solid in the simulation) but none of those lead to a correct result..

Best Regards,
Etienne

Last edited by Wouated; July 16, 2019 at 04:03. Reason: Images not displayed
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combustion modelling, laminar flame, premixed combustion

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