When pump flow was changed,unsteady flow analysis meets trouble

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When pump flow was changed,unsteady flow analysis meets trouble

Jack smith ASA

When pump flow was 2.5 cms,it run well.But when I changed it to 1.5 cms,problem encountered.
Any help would be greatly appreciated.

Geometric Preprocessor Version 4.1.0 Jan 2010
Finished Processing Geometry
Performing Unsteady Flow Simulation  Version 4.1.0 Jan 2010
   ****   Solution Solver Failed   ****
Minimum error exceeds allowable tolerance at   13NOV2011   0926
i               1               10.4*
WARNING!
*****  Extrapolated above Cross Section Table at:  *****
    1 1-5    from R.S.   41.8*  to  41.6*
    1 1-5    R.S.   39.62
    1 1-4    R.S.   39.6*
    1 1-4    from R.S.   38.6666*  to  38.3333*
    d 1    from R.S.   4.6*  to  4.4*
    d 1    from R.S.   3  to  2.5*
    2 1-3    R.S.   23.8*
    2 1-3    from R.S.   22.8*  to  21.8*
    e 1    R.S.   4.8*
    i 1    from R.S.   15  to  12.2*
    i 1    from R.S.   11.6*  to  10.2*
    i 1    from R.S.   9.2*  to  8.4*
    i 1    from R.S.   7.8*  to  7.2*
    1 1-8    R.S.   36.4*
    1 1-8    R.S.   35.8*
    1 1-8    R.S.   35.4*
    1 1-8    R.S.   35
    2 1-5    R.S.   21.2*
    2 1-5    R.S.   20.8*
    2 1-5    R.S.   19.4*
    2 1-5    R.S.   19
    2 1-5    from R.S.   18.6*  to  18.4*
    j 1    from R.S.   1.125  to  1
The maximum water surface error was  2580.164
and occurred at   13NOV2011   09:27:15
Finished Unsteady Flow Simulation
Writing Results to DSS
Finished Writing Results to DSS
Reading Data for Post Process
    Simulation went unstable at: 13Nov2011 09:27:15
    Resetting post process profiles to end at: 13NOV2011 0927
Running Post Processor  Version 4.1.0 Jan 2010

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