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combustion at micro scale

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Old   November 23, 2017, 14:10
Default combustion at micro scale
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tahir
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I am modelling combustion at micro combustor with heptane fuel. it contain 25 species and 34 reaction. i am using laminar, simple and first order scheme with pressure based solver. I am getting higher flame temperature of more than 2500K while in experiment it is around 1700K.
Help is appreciated
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Old   November 22, 2018, 14:32
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Weiqiang Liu
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hello,

Have you ever met the fluent complaining about 'divergence detected in AMG solver: temperature' before.

I am doing a MICRO-combustor simulation. The mechanism is GRI 3.0 and methane surface mechanism.

I have tried a lot of methods to overcome this problem. however, nothing works.

Do you have some experience on how to get convergent results?

thanks
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Old   November 22, 2018, 16:36
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Marius
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Quote:
Originally Posted by ENGRTAHIR View Post
I am modelling combustion at micro combustor with heptane fuel. it contain 25 species and 34 reaction. i am using laminar, simple and first order scheme with pressure based solver. I am getting higher flame temperature of more than 2500K while in experiment it is around 1700K.
Help is appreciated
Which Combustion-Model have you choosen?
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Old   November 22, 2018, 22:10
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Quote:
Originally Posted by racing_student View Post
Which Combustion-Model have you choosen?
finite rate model
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Old   November 23, 2018, 01:27
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Once I used the eddy-dissipation-model and also get a to high temperature. I changed the cp values of the species to polynomal and put the right values in and the problem was fixed
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Old   December 3, 2018, 12:10
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Quote:
Originally Posted by racing_student View Post
Once I used the eddy-dissipation-model and also get a to high temperature. I changed the cp values of the species to polynomal and put the right values in and the problem was fixed


In a lot of literatures, authors would use finite rate model for laminar micro-combustor.

Did you use eddy dissipation model to solve it?
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Old   December 3, 2018, 12:18
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My answer is just based on the high temperature problem, the model I solved was a different problem
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