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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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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.

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,

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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