Dymola¶

Class that translates and simulates a Modelica model with Dymola.

For a similar class that uses OPTIMICA, see buildingspy.simulate.Optimica().

class buildingspy.simulate.Dymola.Simulator(modelName, outputDirectory='.', packagePath=None)¶

Bases: buildingspy.simulate.base_simulator._BaseSimulator

Class to simulate a Modelica model.

Parameters

modelName – The name of the Modelica model.
outputDirectory – An optional output directory.
packagePath – An optional path where the Modelica package.mo file is located.

If the parameter outputDirectory is specified, then the output files and log files will be moved to this directory when the simulation is completed. Outputs from the python functions will be written to outputDirectory/BuildingsPy.log.

If the parameter packagePath is specified, then this directory and all its subdirectories will be copied to a temporary directory when running the simulations.

addModelModifier(modelModifier)¶

Adds a model modifier.

Parameters: modelModifier – A model modifier.

Usage: Type

>>> from buildingspy.simulate.Dymola import Simulator
>>> s=Simulator("myPackage.myModel", packagePath="buildingspy/tests/MyModelicaLibrary")
>>> s.addModelModifier('redeclare package MediumA = Buildings.Media.IdealGases.SimpleAir')

This method adds a model modifier. The modifier is added to the list of model parameters. For example, the above statement would yield the command simulateModel(myPackage.myModel(redeclare package MediumA = Buildings.Media.IdealGases.SimpleAir), startTime=...

addParameters(dictionary)¶

Adds parameter declarations to the simulator.

Parameters: dictionary – A dictionary with the parameter values

Usage: Type

>>> from buildingspy.simulate.Dymola import Simulator
>>> s=Simulator("myPackage.myModel", packagePath="buildingspy/tests/MyModelicaLibrary")
>>> s.addParameters({'PID.k': 1.0, 'valve.m_flow_nominal' : 0.1})
>>> s.addParameters({'PID.t': 10.0})

This will add the three parameters PID.k, valve.m_flow_nominal and PID.t to the list of model parameters.

For parameters that are arrays, use a syntax such as

>>> from buildingspy.simulate.Dymola import Simulator
>>> s = Simulator("MyModelicaLibrary.Examples.Constants", packagePath="buildingspy/tests/MyModelicaLibrary")
>>> s.addParameters({'const1.k' : [2, 3]})
>>> s.addParameters({'const2.k' : [[1.1, 1.2], [2.1, 2.2], [3.1, 3.2]]})

Do not use curly brackets for the values of parameters, such as s.addParameters({'const1.k' : {2, 3}}) as Python converts this entry to {'const1.k': set([2, 3])}.

addPostProcessingStatement(command)¶

Adds a post-processing statement to the simulation script.

Parameters: statement – A script statement.

This will execute command after the simulation, and before the log file is written.

addPreProcessingStatement(command)¶

Adds a pre-processing statement to the simulation script.

Parameters: command – A script statement.

Usage: Type

>>> from buildingspy.simulate.Dymola import Simulator
>>> s=Simulator("myPackage.myModel", packagePath="buildingspy/tests/MyModelicaLibrary")
>>> s.addPreProcessingStatement("Advanced.StoreProtectedVariables:= true;")
>>> s.addPreProcessingStatement("Advanced.GenerateTimers = true;")

This will execute the two statements after the openModel and before the simulateModel statement.

deleteOutputFiles()¶: Deletes the output files of the simulator.

exitSimulator(exitAfterSimulation=True)¶

This function allows avoiding that the simulator terminates.

Parameters: exit – Set to False to avoid the simulator from terminating after the simulation.

This function is useful during debugging, as it allows to keep the simulator open after the simulation in order to inspect results or log messages.

getOutputDirectory()¶

Returns the name of the output directory.

Returns: The name of the output directory.

getPackagePath()¶

Returns the path of the directory containing the Modelica package.

Returns: The path of the Modelica package directory.

getParameters()¶

Returns a list of parameters as (key, value)-tuples.

Returns: A list of parameters as (key, value)-tuples.

Usage: Type

>>> from buildingspy.simulate.Dymola import Simulator
>>> s=Simulator("myPackage.myModel", packagePath="buildingspy/tests/MyModelicaLibrary")
>>> s.addParameters({'PID.k': 1.0, 'valve.m_flow_nominal' : 0.1})
>>> s.getParameters()
[('PID.k', 1.0), ('valve.m_flow_nominal', 0.1)]

getSimulatorSettings()¶

Returns a list of settings for the parameter as (key, value)-tuples.

Returns: A list of parameters (key, value) pairs, as 2-tuples.

This method is deprecated. Use getParameters() instead.

setNumberOfIntervals(n=500)¶

Sets the number of output intervals.

Parameters: n – The number of output intervals.

The default is unspecified, which defaults to 500.

setOutputDirectory(outputDirectory)¶

Sets the name of the output directory.

Parameters: outputDirectory – The name of the output directory.
Returns: The name of the output directory.

setPackagePath(packagePath)¶

Set the path specified by packagePath.

Parameters: packagePath – The path where the Modelica package.mo file is located.

It checks whether the file package.mo exists in the directory packagePath, and then sets the package path. Otherwise, a ValueError is raised.

setResultFile(resultFile)¶

Sets the name of the result file (without extension).

Parameters: resultFile – The name of the result file (without extension).

setSolver(solver)¶

Sets the solver.

Parameters: solver – The name of the solver.

The default solver is radau.

setStartTime(t0)¶

Sets the start time.

Parameters: t0 – The start time of the simulation in seconds.

The default start time is 0.

setStopTime(t1)¶

Sets the start time.

Parameters: t1 – The stop time of the simulation in seconds.

The default stop time is 1.

setTimeOut(sec)¶

Sets the time out after which the simulation will be killed.

Parameters: sec – The time out after which the simulation will be killed.

The default value is -1, which means that the simulation will never be killed.

setTolerance(eps)¶

Sets the solver tolerance.

Parameters: eps – The solver tolerance.

The default solver tolerance is 1E-6.

showGUI(show=True)¶

Call this function to show the GUI of the simulator.

By default, the simulator runs without GUI

showProgressBar(show=True)¶

Enables or disables the progress bar.

Parameters: show – Set to false to disable the progress bar.

If this function is not called, then a progress bar will be shown as the simulation runs.

simulate()¶

Simulates the model.

This method

Deletes output files
Writes a script to simulate the model.
Starts the Modelica simulation environment.
Translates and simulates the model.
Closes the Modelica simulation environment.

This method requires that the directory that contains the executable dymola is on the system PATH variable. If it is not found, the function raises an exception.

translate()¶

Translates the model.

This method

Deletes output files
Writes a script to simulate the model.
Starts the Modelica simulation environment.
Translates the model.
Closes the Modelica simulation environment.

This method requires that the directory that contains the executable dymola is on the system PATH variable. If it is not found, the function raises an exception.

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