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Bentley SWMM Engine Failure when run 24 hours

The model does not complete the run when I do 24 hours simulation, however, it is run when run less simulation time, for example, it is run for 12 hours in spite of using the same parameters in the calculation option.

I upload the model to the secured link for your reference and below are the screenshots of the notification and the calculation summary but could not figure out what is the problem, also before run the validation pass without any problems.

Regards,

Mohamad Azzam

  • I was not able to access the steps to reduce the size of the database.

    This is the correct link: SQLITE database size grows very large due to Change Tracking


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • Hello Jesse,

    is occurring (such as overflow just starting to occur in a case where there is no downstream gutter) only at a time later on in the simulation.

    Yes that if the error occurs in all time simulation, but try to run for 2 hours (for example) the model completes the simulation; however it does not work for 24 hours.

    This model has an unusual configuration of catchbasin connectivity that is unlikely to match the real world conditions

    would you please elaborate what is not match the reality?

    please confirm the scenario to compute and any other changes we need to make

    Here are the screenshots I am working on, please note all the same and as I mentioned I am facing the issue in the 24 hours.

    PS: just would pay your attention to the time it takes the run and would like to remind you about that, hope the new release enhances that, by the way; in UAE all other engineering companies suffering from the time it takes especially because the new standard is to do the model with inlets (that the feedback when I discuss with other engineers here). we all waiting for that big enhancement for saving time, in big models for any change we are waiting a long time till the run finish to see the results, so imagine the project and how long it takes!

    Thank you,

    Mohamad

  • Yes that if the error occurs in all time simulation, but try to run for 2 hours (for example) the model completes the simulation; however it does not work for 24 hours.

    The unstable or unexpected condition likely occurs closer to 24 hours. We are looking into it.

    would you please elaborate what is not match the reality?

    See item #4 from my reply to this thread on January 19th. You can already provided an explanation, but the way it is configured in the model might be contributing to the long run time and potential instability that is causing the model to fail. We do not know for sure yet and will get back to you.

    Here are the screenshots I am working on, please note all the same and as I mentioned I am facing the issue in the 24 hours.

    This appears to be a different scenario than the one shown in your original screenshot. We will take a look.

    PS: just would pay your attention to the time it takes the run and would like to remind you about that, hope the new release enhances that, by the way; in UAE all other engineering companies suffering from the time it takes especially because the new standard is to do the model with inlets (that the feedback when I discuss with other engineers here). we all waiting for that big enhancement for saving time, in big models for any change we are waiting a long time till the run finish to see the results, so imagine the project and how long it takes!

    This was reported to our Development team in March (reference # 815156) and they are still looking into it. I will pass along your remarks.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • Hello Mohammad,

    I tried several combinations of runs but anything beyond 12 hours of simulation time is still giving the same error. We have had some recent improvements in run time especially for large models using the Explicit SWMM solver. We will test your model and see if it helps and share the patch with you.

    Appreciate your patience on this.


    Regards,

    Yashodhan Joshi

  • Hello Jesse/Yashodhan

    We found the reason for the engine failure, in two locations the Inflow Hydrographs are entered in the wrong units, meaning instead of 30 m3/s it is actually 30 L/s and instead of 17.5 m3/s, it is 17.5 L/s. once that is corrected the model runs. 

    Now the issue/question is why the engine reacts to big flow by engine failure, even if the flow is huge and the pipe is small (for such flow); the model should complete the run and gives a warning/report high values?.

    hope that helps in the investigation and feedback.

    Regards,

    Mohamad Azzam