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November 20, 2017, 13:40 |
Timing/activation of combustion model
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#1 |
Senior Member
amin u3fi
Join Date: Feb 2013
Posts: 137
Rep Power: 13 |
Hello,
I'm simulating dual-fuel combustion and found that the HRR curve reaches 0 around 70 ATDC. Can I de-activate the combustion model at this point to reduce the computational time? Does it affect the accuracy? I think there is not heat release after 70 ATDC and it is just expansion (the same as compression before the start of combustion). Regards, Amin. |
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November 20, 2017, 14:28 |
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#2 |
Senior Member
Nitesh Attal
Join Date: Sep 2017
Location: Convergent Science, Northville MI
Posts: 113
Rep Power: 8 |
Hello Amin,
We typically recommend turning ON Combustion modeling 1CA before spark (or spray for diesel). You may turn OFF combustion modeling at EVO if you are not interested in emissions. Please look at our example cases (one which is most similar to you engine) for more recommendations. Thanks, |
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November 20, 2017, 15:01 |
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#3 | |
Senior Member
amin u3fi
Join Date: Feb 2013
Posts: 137
Rep Power: 13 |
Quote:
Regards, Amin. |
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November 20, 2017, 15:14 |
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#4 | |
Senior Member
Nitesh Attal
Join Date: Sep 2017
Location: Convergent Science, Northville MI
Posts: 113
Rep Power: 8 |
Quote:
As a starting point, for additional information/recommendations please look at the Emissions lecture slides in introductory training material, freely available to download from convergecfd.com/downloads CONVERGE_2.4 > Training_Materials > Internal_Combustion_Engine_Modeling_in_CONVERGE > Lecture_Slides > Session10-Emissions.pdf |
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November 21, 2017, 02:12 |
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#5 | |
Senior Member
Tobias
Join Date: May 2016
Location: Germany
Posts: 264
Rep Power: 10 |
Quote:
On the other hand, the simulation does not slow down that much, if there are no big reactions going on at lets say -50 °CA. |
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November 21, 2017, 08:01 |
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#6 |
Senior Member
Nitesh Attal
Join Date: Sep 2017
Location: Convergent Science, Northville MI
Posts: 113
Rep Power: 8 |
If you expect critical temperature and pressure prior to spark then please control the activation time of the combustion model accordingly.
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