Hello, i am new Hec-Ras user. I am building a model that consists of 4 streams that channel water into a moat and i want to run an unsteady flow simulation.
As for boundary conditions i have a flow hydrograph for each stream and a normal depth downstream at the moat
When i run the simulation it was terminated and i got this message:
Performing Unsteady Flow Simulation HEC-RAS 5.0.6 November
Maximum iterations of 20 RS WSEL ERROR
Solution solver went unstable, iteration 12 at 10APR2019 00:10:00
Korakas Rema 3 201 35.77 12.423
Solution solver went unstable, iteration 17 at 11APR2019 00:20:00
Korakas Rema 3 458 25.12 8.712
11APR2019 00:30:00 Gkalntrimos Rema 4 163 9.19 4.313
Solution solver went unstable, iteration 14 at 11APR2019 00:40:00
Korakas Rema 3 1249 33.51 7.934
**** ERROR: Solution Solver Failed ****
Minimum error exceeds allowable tolerance at 11APR2019 00:40:00
Korakas Rema 3 1249
***** Warning! Extrapolated above Cross Section Table at: *****
(The extrapolation may have been caused by model instability)
tafros_litoxwrou litoxwro 2 R.S. 20733
tafros_litoxwrou litoxwro 2 R.S. 19306
Writing Results to DSS
**** The Model Has One Or More Error(s) ****
Unsteady Flow Simulation Terminated
Computations Summary
Computation Task Time(hh:mm:ss)
Completing Geometry(64) 9
Preprocessing Geometry(64) 2
Unsteady Flow Computations(64) 1
Complete Process 18
Can anyone help me with this ?