[E=MC2]

Fellows,

I used an example case in CONVERGE, which runs fine, but changed THE MECHANISM because of analyzing different fuel.

I get this error "error - temperature is greater than max_temp in calc_temp_fraction"

I added more AMR for the temperature, but it didn't work.

Any advice?

[tmburton]

Hello,

Which of our example case setups did you use to start from?
What mechanism did you use to replace the original mechanism?

Best regards,

Tristan

[E=MC2]

Originally Posted by tmburton

Hello,

Which of our example case setups did you use to start from?
What mechanism did you use to replace the original mechanism?

Best regards,

Tristan

Pintle-Injector-IQT
I replaced the n-Heptane mechanism with other chemical component validated mechanism

[jetcheve]

Originally Posted by E=MC2

Pintle-Injector-IQT
I replaced the n-Heptane mechanism with other chemical component validated mechanism

Good afternoon -

I have a few questions to help me out.

1 - What is the fuel you are using?
2 - What mechanism are you using to do this simulation?
3 - Did you change the liquid.dat file to account for your new fuel?
4 - Did you make any other changes, even if they seem insignificant?

If you can answer any of those, it will help me to see if we can get you an answer.

Regards,

- John

[E=MC2]

Hello John,

1-I replaced the nHeptane in the example case by isoCetane
2-I am trying to use a reduced mechanism for isoCetane from the literature
3-I changed the fuel in liquid.dat to account for the corresponding gas properties
4-I only refined the base grid from 0.004 to 0.0008, but that worked fine for nHeptane mechanism example case

[jetcheve]

Originally Posted by E=MC2

Hello John,

1-I replaced the nHeptane in the example case by isoCetane
2-I am trying to use a reduced mechanism for isoCetane from the literature
3-I changed the fuel in liquid.dat to account for the corresponding gas properties
4-I only refined the base grid from 0.004 to 0.0008, but that worked fine for nHeptane mechanism example case

Good morning!

The first three items make sense to me. However - when you increase your resolution by such a substantial amount (and increase your liquid density, in this case) you could create issues with the stability of the solver due to a high ratio of mass in parcels to gas mass in a cell. When you increase your resolution your parcel count should increase as well. Take a look at the spray lecture on our website. You can reach that from the link in my signature below. Once there you can login, and go to the downloads page and find the intro spray lecture in: Root > CONVERGE_2.4 > Training_Materials > Internal_Combustion_Engine_Modeling_in_CONVERGE > Lecture_Slides. In that lecture you should find information on how we recommend increasing parcel count with increased resolution.

Let me know if this helps!

Thanks,

- John

[E=MC2]

Thanks for clarifying this! I am giving it another try, and will inform if there would be a problem.

[E=MC2]

John,

The problem is now solved and simulation is completed. Thank you!