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Simulation of Si engine(Premixed Combustion) at Part load condition

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Old   March 5, 2018, 13:33
Default Simulation of Si engine(Premixed Combustion) at Part load condition
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Pramod Borado
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Hi,
I am trying to simulate SI engine at part load condition. I am using full-cyle geometry and all the boundary conditions as derived from experiments. The following pictures show the comparison between simulation and experimental data for two cycles of simulation. For these simulations, the embedding size around spark location is 5mm and 7mm with embedding scales of 5 and 4.

Another simulation is performed with embedding size of 1mm and 3mm as in the example cases around the spark location with same embedding scales and the simulation gives different results this time. The comparison with experimental is shown in 1st figure.

There is is a significant variation in HRR too for different cases and the trend does not match with experimental(Picture here shows the trend). The HRR curves for different cases are shown here.

Can anyone give me some advice on how to solve this problem and help me understand things better.

Thanks in advance
Attached Images
File Type: jpg Cycle1_Pressure.JPG (59.5 KB, 19 views)
File Type: jpg Cycle2_Pressure.JPG (55.5 KB, 19 views)
File Type: jpg Cycle1_HRR.JPG (57.8 KB, 17 views)
File Type: jpg Cycle2_HRR.JPG (60.0 KB, 14 views)
File Type: jpg HRR_exp.JPG (36.9 KB, 15 views)
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Old   March 5, 2018, 17:49
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Sameera Wijeyakulasuriya
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Hi Pramod,

Can you email your case setup files at support@convergecfd.com using your official email? We will help you figure out these differences and what needs to be done to obtain accurate predictions.

Thanks,
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Old   March 6, 2018, 00:37
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I have sent the case setup files to support@convergecfd.com. Please look into them and help me solve the problems.

Thanks.
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Old   March 6, 2018, 11:32
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Sameera Wijeyakulasuriya
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Pramod,

We have received your case and one of our support engineers will get in touch with you on this.

Thanks,
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