error division by zero

[mohamed]

Dear all,

I have a problem with a model generating
an error division by zero.

Using these scripts wihin OMShell:

loadFile("C:/Users/sridim/Desktop/gaspropreties.mo")
true

simulate(gaspropreties.intake1)

will generate the following error:
record SimulationResult

resultFile = "",
simulationOptions = "startTime = 0.0, stopTime = 1.0, numberOfIntervals = 500, tolerance = 1e-006, method = 'dassl', fileNamePrefix = 'gaspropreties.intake1', storeInTemp = false, noClean = false, options = , outputFormat = 'mat', variableFilter = '.*', measureTime = false, cflags = ",
messages = "Simulation execution failed for model: gaspropreties.intake1

warning | division by zero in partial equation: 1.0 / pco1 because pco1 == 0

| [line] 263 | [file] gaspropreties.intake1.c

throw | [line] 43 | [file] util/division.c

| division by zero

",

timeFrontend = 0.0,
timeBackend = 0.0,
timeSimCode = 0.0,
timeTemplates = 0.0,
timeCompile = 0.0,
timeSimulation = 0.0,
timeTotal = 0.0

end SimulationResult;

Attached,please find the full model(file.mo).

Best regards,
Mohamed,

[Jens Frenkel]

this is a problem with initialisation and start values.

The initialisation method called the system without set init()=true before initialisation. Either change the startvalue of pco1 to 14... or call initialisation with init()=true.

[Willi Braun]

Yes, we have some issues with the initial operator. Lennart and me start to think about a better handling while the initialization.
As Jens mention a workaround is to provide a start-value != 0 to aco1.