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

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  • January 21, 2017 at 1:14 am #6330
    Anonymous
    Guest

    I’m trying to calculate the floodplain of a river using unsteady flow analysis. Halfway through the unsteady flow simulation, I get the following error, with the first two lines in black text and the following five in red:

    HDF_ERROR trying to use HDF output file
    Subroutine HDF_WRITE_RULE_SET

    Unsteady flow encountered an error.

    HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 0:
    #000: ..\..\src\H5D.c line 437 in H5Dget_space(): not a dataset
    major: Invalid arguments to routine
    minor: Inappropriate type

    Any idea what I’m doing wrong?

    January 23, 2017 at 9:40 am #10339
    cameron
    Participant

    Have you tried deleting all the hdf file and rerunning? Also make sure you are using the latest version of HEC-RAS.

    January 23, 2017 at 5:26 pm #10340
    Anonymous
    Guest

    When I do that, I get these errors:

    Data for 2D Area is missing.
    Check the Geometry Associations and
    the 2D mesh for problems.

    Unsteady flow encountered an error.

    HDF5-DIAG: Error detected in HDF5 (1.8.11) thread 0:
    #000: ..\..\src\H5G.c line 463 in H5Gopen2(): unable to open group
    major: Symbol table
    minor: Can’t open object
    #001: ..\..\src\H5Gint.c line 320 in H5G__open_name(): group not found
    major: Symbol table
    minor: Object not found
    #002: ..\..\src\H5Gloc.c line 430 in H5G_loc_find(): can’t find object
    major: Symbol table
    minor: Object not found
    #003: ..\..\src\H5Gtraverse.c line 861 in H5G_traverse(): internal path traversal failed
    major: Symbol table
    minor: Object not found
    #004: ..\..\src\H5Gtraverse.c line 641 in H5G_traverse_real(): traversal operator failed
    major: Symbol table
    minor: Callback failed
    #005: ..\..\src\H5Gloc.c line 385 in H5G_loc_find_cb(): object ‘McComb river’ doesn’t exist

    And yes, I do have the latest version.

    January 23, 2017 at 7:14 pm #10341
    cameron
    Participant

    did you recompute the tables for the 2D area? Are there any problems with your mesh?

    January 23, 2017 at 7:41 pm #10342
    Anonymous
    Guest

    I did, and there weren’t.

    January 23, 2017 at 10:24 pm #10343
    Anonymous
    Guest

    – deleted –

    January 25, 2017 at 7:03 pm #10344
    Anonymous
    Guest

    I feel I should add that this error occurs the moment I begin the unsteady flow simulation. The geometry preprocessor works fine, and steady flow simulations work fine as well, but as soon as hec-ras tries to run an unsteady flow calculation, that error pops up.

    January 27, 2017 at 7:47 pm #10345
    Anonymous
    Guest

    I have resolved this error, and will now explain what I did wrong in case someone in the future has the same problem.

    In my river, there was a small inline dam with a square opening. I figured it would be easier to represent this with a gate than a culvert, even though it never opened or closed. I implemented rules for this gate to make sure it stayed open; however, it was these rules that caused the error, for I believe I had entered them improperly. The instant I deleted them and replaced the gate with a box-shaped culvert, everything worked fine.

    February 14, 2020 at 11:15 pm #10346
    Anonymous
    Guest

    I keep getting the following error:

    “Unsteady flow encountered an error
    Error starting unsteady simulation – Stopping compute process”

    This only happens when I run the transient model with the “Sediment” box checked. I swear this model worked last year. I can think of any changes I made to it since. Please advise. Thanks.

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