Unsteady Flow Error Message

[Taylor Sun]

I am trying to run an unsteady flow model and I keep getting the following error messages:
– “Maximum iterations of 40 at:” and then there is a list of several cross sections.
-“Minimum error exceeds allowable tolerance at” and then there is a cross section listed.

I keep getting the red bar and my model hasn’t been able to get past the first three hours.

I thought that maybe some of my cross sections were too close together and it was causing instability but now I have deleted over half of my cross sections and I keep getting these error messages. I’m all out of ideas on how to fix this.

Can anyone help me with this?

[cameron]

What is the timestep for the model? Try lowering it to see if the model becomes stable. Have you tried using a minimum flow for the inflow hydrographs, adjusting the HTAB parameters, adjusting ineffective areas so the active top width have a smooth transition between cross-sections, or pilot channels?

[Anonymous]

Right now I have a time step of 10 minutes but I will try to lower it. I have entered in a minimum flow for all my hydrographs. The only HTAB parameter I adjusted was the number of iterations, I increased it to the maximum amount. And I haven’t adjusted ineffective flow areas but I will try that as well. Thank you for all the suggestions I’ll let you know how they worked out!

[Author]

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