Simulation went unstable at: 14Aug2010 00:00:00 (unteady Flow) Levee breach analysis

[Anonymous]

Anyone can help me…

While running unsteady flow simulation i get the following errors I am trying to model Levee breach between two barrages.

Geometric Preprocessor Version 4.1.0 Jan 2010

Finished Processing Geometry

Performing Unsteady Flow Simulation Version 4.1.0 Jan 2010

Maximum iterations of 40 at: RS WSEL ERROR
06AUG2010 00:00:00 Unhar escape kirthar 216140.9 53.24 5.106
07AUG2010 00:00:00 Unhar escape kirthar 284733.2 59.68 3.569
08AUG2010 00:00:00 Unhar escape kirthar 202320.1 48.94 32.208
09AUG2010 00:00:00 Unhar escape kirthar 247731.3 169.26 22.182
10AUG2010 00:00:00 Unhar escape kirthar 250103.4 945.50 26.068
11AUG2010 00:00:00 Unhar escape Nasir Br 379273.8 115.33 48.270

**** Solution Solver Failed ****

Minimum error exceeds allowable tolerance at 12AUG2010 2400

Unhar escape Nasir Br 382040.5
WARNING!

***** Extrapolated above Cross Section Table at: *****

Unhar escape Nasir Br R.S. 382040.5
Unhar escape Nasir Br from R.S. 380848.3 to 378419.7
Unhar escape Nasir Br from R.S. 374993.5 to 356898.9
Unhar escape Nasir Br from R.S. 349151.4 to 336897.5
Unhar escape Nasir Br R.S. 324944.9
Unhar escape Nasir Br from R.S. 312434.8 to 308982.5
Ghari Khairo shadadkot from R.S. 44423.51 to 42549.6
Ghari Khairo shadadkot from R.S. 19947.35 to 17464.64
Ghari Khairo shadadkot R.S. 1.884228
Unhar escape kirthar R.S. 284733.2
Unhar escape kirthar from R.S. 268828.4 to 264926.6
Unhar escape kirthar from R.S. 258096.9 to 247731.3
Unhar escape kirthar from R.S. 242096.9 to 238151.4
Unhar escape kirthar R.S. 230124.3
Unhar escape kirthar R.S. 222096.9
Unhar escape kirthar from R.S. 216140.9 to 206097.6
Unhar escape Manchar from R.S. 194076 to 194044.2
Unhar escape Manchar from R.S. 190330.7 to 172010.5
Unhar escape Manchar from R.S. 164000 to 160000
Unhar escape Manchar from R.S. 2651.86 to 469.8999
Indus Guddu to Tori from R.S. 548557.1 to 548058.7
Indus Guddu to Tori R.S. 363763.7
Indus Guddu to Tori R.S. 358011.3
Indus Guddu to Tori from R.S. 356706.2 to 356665.8
Indus Guddu to Tori R.S. 338278.1
Indus Punjnad to Guddu from R.S. 556658.4 to 548582.8
Indus Lower indus from R.S. 58269.26 to 39000
Indus Lower indus R.S. 35000
Indus Lower indus from R.S. 21000 to 20000
Indus Lower indus from R.S. 17000 to 15000

Finished Unsteady Flow Simulation

Writing Results to DSS
Finished Writing Results to DSS

Reading Data for Post Process
Simulation went unstable at: 14Aug2010 00:00:00
Resetting post process profiles to end at: 06AUG2010 2400

Running Post Processor Version 4.1.0 Jan 2010

Finished Post Processing

Task Time
Preprocessing Geometry 1.44 sec
Unsteady Flow Computations 1.30 sec
Writing to DSS 0.34 sec
Post-Processing 2.79 sec
Complete Process 5.88 sec
Computation messages written to: C:\HECGEoRAsWork\March28\march28UnstLessMann.p04.comp_msgs.txt

[Anonymous]

In the RAS solution, extrapolation beyond the property tables can either the result of instability or the cause of it. I suggest that, as a quick test, you extend the HTAB tables to see what happens.

[Author]

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