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4 Stroke HSDI Case Tutorial Discontinuity

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  • July 3, 2014 at 5:27 pm #327
    kinogoproo kinogoprookinogoproo kinogoproo
    Member

    I had a question about the convergence of the tutorial that is posted here:

    http://openwam.webs.upv.es/manual/index.php?title=Downloads

    I am able to run the case successfully, but was wondering about the discontinuity in pressure/temperature and torque as seen on the instantaneous results (second image). We also see that the fuel consumption and net torque keep getting worse over the simulation cycles. It appears that the turbocharger is not providing the air required to burn the fuel (first image).

    I was wondering if this is because the case is only to show how a system can be made, or if there are additional setting in WAMer that I didn’t provide.

    Thanks

    July 4, 2014 at 7:00 am #485
    sreenathiit12sreenathiit12
    Member

    The example that you are using is very old. Use this, is very similar but adapted to the latest version of the code. Take into account that it is an example and it does not represent a real engine.

    http://sourceforge.net/projects/openwam/files/OpenWAM%20v2.0.3/Examples/4_Strokes_Turbocharged_HSDI_Engine_CD.PCS/download

    Regarding to the discontinuity detected it does not exist. The angle step for the instantaneous results can be modified. “Right click on EJEC -> Mean and instantaneous results”. The problem that you have detect is the 2 degrees between the last data printed in the cycle 5 and the first data of the cycle 6. The difference seems very high due to the high slope of the parameter that you have represented.

    July 16, 2014 at 4:55 pm #486
    kinogoproo kinogoprookinogoproo kinogoproo
    Member

    Thank you very much for the reply. I have tested it and confirmed that it works.

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