[ENGRTAHIR]

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

[Weiqiang Liu]

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

[racing_student]

Originally Posted by ENGRTAHIR

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?

[Weiqiang Liu]

Originally Posted by racing_student

Which Combustion-Model have you choosen?

finite rate model

[racing_student]

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

[Weiqiang Liu]

Originally Posted by racing_student

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?

[racing_student]

My answer is just based on the high temperature problem, the model I solved was a different problem