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elisa

Dynamic state in FESWMS

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Hi, I'm a new member, I'm working about my degree thesis and I have problems on FESWMS version8.1.

I have problems in the Dynamic state.

When I run FESWMS the simulation doesn't start and appears this:

Reading "prova2.dat"...

Reading network data file "prova2.net"...

Reading "prova2.flo"...

Initializing...

Reading "prova2.dat"...

Reading "prova2.dat"...

Time 0000:12:00 - Iteration 1

Time 0000:12:00 - Iteration 2

Time 0000:12:00 - Iteration 3

Writing scalar data ...

File name missing or blank - please enter file name

And I don't understand why with the same Time step size value I can obtain different FESWMS outputs when I run FESWMS. Sometimes I have convergence but the simulation doesn't start and sometimes I have the problem of:

Writing scalar data ...

File name missing or blank - please enter file name

and sometimes I have this problem:

Reading "prova2.dat"...

Reading network data file "prova2.net"...

Reading "prova2.flo"...

Initializing...

Reading "prova2.dat"...

Reading "prova2.dat"...

Time 0000:06:00 - Iteration 1

Time 0000:06:00 - Iteration 2

Time 0000:06:00 - Iteration 3

Time 0000:06:00 - Iteration 4

Time 0000:06:00 - Iteration 5

Time 0000:06:00 - Iteration 6

Time 0000:06:00 - Iteration 7

Time 0000:06:00 - Iteration 8

Time 0000:06:00 - Iteration 9

Time 0000:06:00 - Iteration 10

Time 0000:06:00 - Iteration 11

forrtl: severe (157): Program Exception - access violation

Image PC Routine Line Source

flo2dh.exe 0041781A Unknown Unknown Unknown

flo2dh.exe 0041472E Unknown Unknown Unknown

flo2dh.exe 0043AD66 Unknown Unknown Unknown

flo2dh.exe 004394D8 Unknown Unknown Unknown

flo2dh.exe 00436C44 Unknown Unknown Unknown

flo2dh.exe 0052DCD9 Unknown Unknown Unknown

flo2dh.exe 00520014 Unknown Unknown Unknown

KERNEL32.dll 7C5989D5 Unknown Unknown Unknown

Can the Time step size value changes the solution?

Is it possible that I have convergence on the Steady state but then on the Dynamic state I don't have convergence or if I have it the progress bar doesn't inizialize after the first time step is complete? The bar stays at 0%. I don't know why!

Thank you very much.

Elisa

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Can the Time step size value changes the solution?

FESWMS is less sensitive to time step size than many models. However, if the boundary conditions change significantly from time step to time step, FESWMS may not be able to converge.

Is it possible that I have convergence on the Steady state but then on the Dynamic state I don't have convergence or if I have it the progress bar doesn't inizialize after the first time step is complete? The bar stays at 0%. I don't know why!

To check for convergence, open the Report data file (.rpt - .prt for SMS) and search for the word "Convergence". You should find a section that looks like this:

*** CONVERGENCE PARAMETERS ***

================================================================================

Variable Units Ave Change Max Change Value Node Rank

-------------------------- -------- ---------- ---------- ---------- ------ ----

X unit flow rate ft^2/sec 0.794E-02 0.259E-01 18.592 561 1

Y unit flow rate ft^2/sec 0.366E-02 -0.162E-01 -14.641 2440 1

Water surface elevation ft 0.622E-03 0.270E-02 52.024 2667 1

================================================================================

If the model converges (according to the criteria you have set in the FESWMS Model Control Dialog), the following will be printed to the prt file after the last time step/iteration:

===> Convergence tolerances satisfied <===

You can also look in the Run status data (.sta) file for just the convergance output

forrtl: severe (157): Program Exception - access violation

The FESWMS model has become unstable and crashed. You should look in the prt file to determine which nodes/elements were causing problems and adjust your finite element mesh. You may also need to use incremental loading with hotstart files or the steering module. For more information on incremental loading, see the following:

Steering http://www.xmswiki.com/index.php?title=SMS:Steering

FESWMS Spindown http://www.xmswiki.com/index.php?title=SMS:FESWMS_Spindown

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Thank you for your answer.

Now my simulation runs also in the dynamic mode but I have obtained negative values of water depth. I have insert default storativity of 10 meters because with lower default storativity values the simulation can't finish and I have this problem:

writing scalar data..

file missing or blank - please insert file name

Do you know which is the problem?

Could a high default storativity cause negative depths?

Thank you very much!!!

Elisa

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Storativity allows an element to remain active as long as the water surface elevation is above the highest node value minus the storativity depth (10 meters in your case - very large). This is why storativity results in negative water depth values. Even a small storativity can cause negative depths. For more information, see the User's Manual for FESWMS FST2DH (default installation location is C:\Program Files\SMS 10.0\docs).

Did you turn on wetting and drying? Unless this is checked, FESWMS will not allow elements to wet and dry during a simulation. It i son the Parameters tab of the model control.

As far as the missing file name, I would verify that all of the files specified in the model control are correct.

- John

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