TAGGED: autoignition, combustion, fgm, heat-release
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July 17, 2024 at 6:49 pm
Mathieu G
SubscriberHi,
I'm running a 3D transient simulation using the Partially Premixed Combustion Non-adibatic FGM model.
I want to capture the auto-ignition of a hot gas mixture jet.
I'm initializing my domain with a mixture fraction and progress variable at 0.
A mass-flow inlet is used to create the jet, the temperature is fixed (800°C) and the mixture fraction is set to 1. I don't observe any ignition unless I'm patching the progress variable or adding a sparkIs there a way to capture auto-ignition with the FGM model?
I also have issues with the heat release rate value computed using a Volume-Integral on my domain (From PDF>Heat Release Rate). The value is often negative even when a flame is present.
According to the User's Guide (p4200), the HRR is the source term defined in eq 5.11 of the Theory Guide. However, the Theory Guide states that when using the non-adiabatic non-premixed combustion model the reaction sources of energy are not included in Eq 5.11. So what hat is Fluent computing as the heat release rate?Thank you,
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July 22, 2024 at 12:35 pm
Ren
Ansys EmployeeHello, Mathieu,
The FGM is not suitable for predicting auto-ignition. For this purpose, you need to have a reaction mechanism that has the necessary kinetics (reactions) for auto-ignition, and also use the species transport model with "Finite-Rate/No TCI" option.
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September 25, 2024 at 7:41 pm
Mathieu G
SubscriberHi Ren,
Thank you for your answer. I'll try with the Finite Rate/No TCI model.
Do you have any idea why i'm having a negative HRR when using partially premixed combustion models ?
Thanks !Â
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- The topic ‘Transient FGM (Ignition and Heat Release Rate)’ is closed to new replies.
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