Minimum Error Exceeds allowable Tolerance

[CJones]

I am recreating a HEC-RAS model that works (dam failure, unsteady flow). I am using the original geometry data, have my dam breach data, flow hydrograph, mixed flow regime enabled, and time step the same as the original model. My hydrograph uses 6 minute intervals and starts at 14FEB2019 2400. I am running my model starting at 15FEB2019 0000 and stopping it before the data ends with time steps of 1 minute (same as original). I keep getting the error “Minimum error exceeds allowable tolerance at 14FEB2019 24:00:00” and “Simulation went unstable at 15FEB2019 00:01:00”. Any ideas about how to fix this?

[Anonymous]

First guess without knowing more….decrease your time step.

[CJones]

I decreased my time step, trying 30sec and 20sec, but I got the same error. Each time the simulation went unstable at 30sec and 20sec respectively. Any other ideas?

[Anonymous]

Dear Sirs, good afternoon.
I was facing the same error, but I have fixed it changing the time step, and in my case, it worked very well.

[Author]

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