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Problem of ignition comparison between V2.4 and V3.0 |
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#1 |
New Member
Liu
Join Date: Jun 2020
Posts: 3
Rep Power: 2 ![]() |
By comparing the ignition between CONVERGE 2.4 and 3.0, I found a problem as follows.
Since 'source.max_value' in 'source.in' must be less than 5000K in V3.0 compared with 50000K in V2.4, the ignition delay in V3.0 is much slower than that in V2.4, so is the combustion process. This phenomenon is much serious in high speed condition like 5500rpm/WOT, which causes a bad result of misfire in V3.0. (Source type is energy) How to solve this problem? Last edited by Henrylyd; June 18, 2020 at 02:40. |
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#2 | |
New Member
Join Date: Jun 2020
Posts: 6
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Hi Liu, Depending on the problem, the maximum temperature in source.in can be adjusted. Higher maximum temperatures can help with quicker combustion propagation. However, the high gradient of temperature at cell points should be monitored.
Quote:
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Pedram Tazraei, Ph.D. Research Engineer Convergent Science, Inc. Madison, WI, USA www.convergecfd.com |
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#3 | |
New Member
Liu
Join Date: Jun 2020
Posts: 3
Rep Power: 2 ![]() |
Quote:
The problem is, 'source.max_value' in 'source.in' must be less than 5000K in V3.0, or the program doesn't start up. With this small temperature setting, the phenomenon of misfire often happens in condition of 5500rpm/WOT. How to solve this problem? |
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#4 |
New Member
Join Date: Jun 2020
Posts: 6
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Hi Liu, thank you for your question. The user should be able to input a desired value for the max_value not limited to 5000K. As I mentioned in the previous post, the high gradient of temperature in cells might cause your simulation to crash. Your log file should help us find out the error you get. So please contact our support team at support@convergecfd.com.
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Pedram Tazraei, Ph.D. Research Engineer Convergent Science, Inc. Madison, WI, USA www.convergecfd.com |
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#5 | |
New Member
Liu
Join Date: Jun 2020
Posts: 3
Rep Power: 2 ![]() |
Quote:
Thanks very much for your support. Actually, the problem I encounter is that, unlike in V2.4, when I simulate the combustion process of ICE 5500rpm/WOT in V3.0, it often misfires. In my experience, the reason may be the limitation of max_value 5000K. By the way, I also tried passive as the source, which didn't help. I know the high temperature gradient will cause 'temperature exptrapolating...' issue, but it is not the problem I face. There is no error in log file. So if I use G-equation model, how do I solve this misfire problem in 5500rpm/WOT? |
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