Hydraulic Structures and Model Run Time
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I have been adding hydraulic structures to one of my models. I have been noticing since I have done that, my model time steps have gone from 7 - 8 seconds a time step to 0.003 seconds or worse per a time step. One Model is small in area, has modestly sized grid cells, and would run in less than three hours to get through a 14-hour simulation. With the addition of two hydraulic structures, the model has now been running for over 24 hours and has only made it through 1.5 hours of simulation time. Does anyone have any tricks to improve the time steps with hydraulic structures? At the current model run rate, the model will run for 13 days. I guess I am having a problem understanding why the model run times would see a 100-fold increase by adding rating curves for two structures. Any help will be greatly appreciated!
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Hydraulic structures shouldn't affect the timestep like that. You might have the structure set up incorrectly. Check the hystruc.dat file against the one in the data input manual. Try to isolate which structure is causing the timestep decrements by running the model with one structure on at a time. Just do this by deleting the other structure from the data file.
There is also a training video for hydraulic structures.
http://www.flo-2d.com/webinars
If you still have problems once you've found the structure and are sure it is set up correctly, make some test runs on it. Use the Time.out file to help determine which grid element is causing the timestep decrements. Then use the pocket guide to help you optimize the "Sticky" grid element.
There is also a Free optimization training video on the website.
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