Hi,
I try to use OpenModelica to simulate a part (the approch system) of a papermachine.
But I meet problems when I try to use examples of Fluid package (see below the error messages).
Furthermore, I have not found good readings about the modelisation of water system (how to manage connections, tanks, pumps and so on).If you have suggestion ?
If somebody can help me...
Thanks in advance
Best Regards
Raphaël
<<<
Example of trying to use PulpingSystem => messages occuring after clicking the "simulation" button
in Message Broswer

[1] 08:08:59 Scripting Notification
Linear iteration variables with predefined start attributes that are unrelevant in NLSJac28. (2)
========================================
1: userValve.m_flow:VARIABLE(min = max(-100000.0, max(-1e+060, max(0.0, max(0.0, 0.0)))) max = min(100000.0, min(1e+060, min(100000.0, min(100000.0, 100000.0)))) start = 0.0 unit = "kg/s" )  "Mass flow rate in design flow direction" type: Real
2: userValve.dp:VARIABLE(start = userValve.dp_start unit = "Pa" )  "Pressure difference between port_a and port_b (= port_a.p - port_b.p)" type: Real

Info: Only non-linear iteration variables in non-linear eqation systems require start values. All other start values have no influence on convergence and are ignored. Use "-d=dumpLoops" to show all loops. In OMEdit Tools->Options->Simulation->OMCFlags, in OMNotebook call setCommandLineOptions("-d=dumpLoops")


Linear iteration variables with predefined start attributes that are unrelevant in NLSJac29. (2)
========================================
1: pipe.flowModel.m_flows[1]:VARIABLE(min = max(0.0, max(-100000.0, max(-1e+060, max(-1e+060, -1e+060)))) max = min(100000.0, min(100000.0, min(100000.0, min(100000.0, 100000.0)))) start = 0.0 unit = "kg/s" )  "mass flow rates between states" type: Real [1]
2: pipe.flowModel.dps_fg[1]:VARIABLE(start = pipe.flowModel.p_a_start - pipe.flowModel.p_b_start unit = "Pa" )  "pressure drop between states" type: Real [1]

Info: Only non-linear iteration variables in non-linear eqation systems require start values. All other start values have no influence on convergence and are ignored. Use "-d=dumpLoops" to show all loops. In OMEdit Tools->Options->Simulation->OMCFlags, in OMNotebook call setCommandLineOptions("-d=dumpLoops")

[2] 08:08:59 Scripting Warning
Requested package Modelica of version 3.2.2, but this package was already loaded with version 3.2.3. You might experience problems if these versions are incompatible.

[3] 08:08:59 Symbolic Warning
The model contains alias variables with conflicting start and/or nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts.

Message in the window which open during the simulation
C:/Users/passasr/AppData/Local/Temp/OpenModelica/OMEdit/Modelica.Fluid.Examples.PumpingSystem/Modelica.Fluid.Examples.PumpingSystem.exe -port=58194 -logFormat=xmltcp -override=startTime=0,stopTime=2000,stepSize=0.4,tolerance=1e-06,solver=dassl,outputFormat=mat,variableFilter=.* -r=C:/Users/passasr/AppData/Local/Temp/OpenModelica/OMEdit/Modelica.Fluid.Examples.PumpingSystem/Modelica.Fluid.Examples.PumpingSystem_res.mat -w -lv=LOG_STATS -inputPath=C:/Users/passasr/AppData/Local/Temp/OpenModelica/OMEdit/Modelica.Fluid.Examples.PumpingSystem -outputPath=C:/Users/passasr/AppData/Local/Temp/OpenModelica/OMEdit/Modelica.Fluid.Examples.PumpingSystem
The simulation finished successfully.
The following assertion has been violated at time 0.000000
pipe.flowModel.m_flows[1] >= 0.0 and pipe.flowModel.m_flows[1] <= 100000.0
Variable violating min/max constraint: 0.0 <= pipe.flowModel.m_flows[1] <= 100000.0, has value: -141.424
The initialization finished successfully without homotopy method.
The following assertion has been violated at time 200.000000
valveOpening.y >= 0.0 and valveOpening.y <= 1.0
Variable violating min/max constraint: 0.0 <= valveOpening.y <= 1.0, has value: 1
Warning: maximal number of iteration reached but no root found
Warning: maximal number of iteration reached but no root found
### STATISTICS ###