Signs of Instability and Reliability of model Results (Explicit Solver) from the look of HGL/EGL in profiles

Dears,

A topic for discussion which was once raised but didn't seem to have concluded except for reference to use the most recent release of the software which may or may not be related to the causes... anyhow, the difference in this post is that we have a suspected case which model will be provided to be investigated ... then may be we can conclude a couple of lessons learned out of the exercise.

The main drivers are:

1. Is there anything suggesting instability in the profiles views?

2. how would you go about verifying that in the actual model? (time steps / continuity errors/ hydraulic results reviewer / what else to look for)

3. Then ultimately, is it acceptable and would you argue against any other views?

P.S: model sent via secure file

Thanks 

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  • Hello,

    Here are your responses;

    1. Is there anything suggesting instability in the profiles views?

    Can you elaborate on this query? The water surface profiles generated follow the principles of dynamic wave routing for the SWMM solver. Are you having any concern with the way the profiles are represented? Any other issues (export etc.)?

    2. how would you go about verifying that in the actual model? (time steps / continuity errors/ hydraulic results reviewer / what else to look for)

    For a model in CivilStorm working on the SWMM solver, there are a few things to look for when checking the fitness of the solution. You have to check for continuity and connectivity errors, calculation time steps etc. Here is a relevant article which discusses this in detail;

    Troubleshooting unstable SewerGEMS and CivilStorm model results using the Explicit SWMM Solver

    3. Then ultimately, is it acceptable and would you argue against any other views?

    Can you also elaborate on this? What is that needs to be accepted? The software CivilStorm is a tool which is used for designing and analyzing storm-sewer networks. The results which are generated are based on the engineering design of the user and follow the standard and established laws of hydraulics and hydrology.


    Regards,

    Yashodhan Joshi

    Bentley Technical Support

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