GeomPreprocessor.exe has stopped working

[Scott La Vanne]

I’m performing an unsteady flow simulation in HEC-RAS 4.1.0. When I run the geometry preprocessor, the progress bar goes all the way to the end and appears to finish. Then before the Unsteady Flow Simulation begins I get the error, “GeomPreprocessor.exe has stopped working”. Nothing proceeds from this point until I click “Stop”. Has anyone encountered this error before? Plugging the error message into Google yields less than two pages of results, none of which have been helpful.

I created the geometry using HEC-GeoRas then modified the more complicated elements within HEC-RAS.

Things I’ve already tried:
– Restarting the computer
– Filtering the Cross Sections
– changing universal HTAB parameters
– exporting the geometry data and reimporting into an entirely new project file.

The only option left I can think of is starting over with rebuilding the geometry from scratch and hope I don’t get the error again. I’ve already invested a lot of time into the geometry so I’d obviously like to avoid that.

Thanks for any insight you might provide!

[Scott La Vanne]

For anyone else who may come along later with the same error this is what I have learned.

1. the geometry worked in a steady state simulation so I suspected that a geometric element that is only active during unsteady simulations was to blame.

2. I isolated the problem element to a single lateral structure that connected two parallel reaches. Deleting the structure allowed the unsteady simulation to run. Despite many attempts to revise the structure and channel geometry I could not get the simulation to run with the structure present. There are multiple other very similar lateral structures present in the model that do not create this problem. I don’t know what made this structure unique.

I eventually decided that the structure wasn’t critical to the results I was interested in, and not worth investigating further. If anyone comes along with further insight I’d still be interested to hear your thoughts.

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