I am receiving the error “Error with program: RasUnsteady64.exe Exit Code = -1073741819” in my combined 1D/2D model. I am making changes in the 1D portion and the model runs fine before that and in another case where I edit the 1D portion for a different scenario. I do not change the 2D portion or any 1D/2D connections. The WSEL and error starts to go crazy in a 2D cell that is not adjacent to the 1D area, adn then at a couple cross sections on the river (in 1D).
Anyone have guidance on what this error is typically related to and how to resolve it?
Sorry I can’t help. I’m getting the same error running a 2D model with high flows and an abrupt change in flow. I’m guessing one of these is causing the error. Does your model have some of the same characteristics? What’s your time step?
Thanks for the reply. My flows haven’t changed from previous runs that gave me no problems, however, the geometry has changed in the 1D portions. The bed elevations now change more drastically between cross sections, but I haven’t been able to resolve the issue by smoothing the transitions. Time step is 30 sec. I thought maybe it was an error in the 2D since the WSEL and error increases quite a bit in 2D cells before crashing, which it seems to be if your model is all 2D. However, I have not altered my 2D portions since getting the model to run successfully. I was hoping someone would have insight to the error code to help me know where to look next. Also, I get the same error when running both high and low flow events. Does any of this info help you?
That error code is not useful as it is basically saying it is just crashing.
My guess is that the 1D portion of your model is going unstable causing odd results. If the 1D channel is quite different, make sure ineffective flow areas are set correctly, maybe add some interpolated cross-sections to see if that fixes the issue.
Do you have the 1D/2D iterations turned on?
Are the weir coefficients for your lateral structure reasonable?