Welcome to the RAS Solution › Forums › HEC-RAS Help › Unsteady flow error

  • This topic has 3 replies, 172 voices, and was last updated 5 years ago by Anonymous.
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  • November 8, 2019 at 8:07 am #7516
    Anonymous
    Guest

    When running a unsteady flow analysis I got the following error, any thoughts of how to resolve it. Thanks

    WARNING! Solution Solver Failed. Unstable for initial iteration. !!!

    November 8, 2019 at 8:08 pm #12594
    Scott Miller
    Participant

    1D, 2D, or a mix?

    November 9, 2019 at 5:40 am #12595
    Anonymous
    Guest

    1D model

    December 6, 2019 at 3:05 am #12596
    Scott Miller
    Participant

    Make sure your initial and boundary conditions keep all cross sections wetted. A steeper reach between cross sections can project a water surface below the downstream cross section. Is there anywhere in your model this might happen?

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