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enabling unsteady diffusion flamelet model

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Old   August 18, 2014, 06:26
Default enabling unsteady diffusion flamelet model
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Hi everybody,
I'm trying to get a numerical simulation of a lifted H2/N2 flame with coflow using the flamelet models available in FLUENT. I read on User's Guide that it's necessary to firstly carry out a steady diffusion flamelet simulation and only after it should be available the unsteady diffusion flamelet option.
However, while I succeeded using the steady diffusion model with "non-adiabatic" option (temperature and species contuos plot show me that combustion occurs), I'm experiecing difficulties to make unsteady flamelet model work.
Actually, residual seems to reach covnergence every time step but temperature and species convergence plots show me that anything change (the whole domain appears to remain unchanged after that).

I attach the parameters used for creating flamelets and pdf tables.
Thank you in advance, I really appreciate any kind of advice.

P.S. I'm a newbie in the forum! I'm sorry if I missed some information or if I put this thread in the wrong section.
Attached Images
File Type: jpg fla_param.jpg (60.4 KB, 44 views)
File Type: png unsteady_fla_param.png (34.3 KB, 39 views)
File Type: jpg pdftable_param.jpg (66.4 KB, 35 views)
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Old   April 24, 2015, 15:58
sanjeet Limbu
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Hi I am trying use the flamelet model for partilaly premixed..
I want to get the autoignition profile for nheptane: N2/O2?ar/nC7H16..
but getting some error can you help me set up model ... I am new to autoignition
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File Type: jpg Flamelet model.jpg (49.9 KB, 25 views)
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fluent 14.5, lifted flame, unsteady flamelet

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