環境はWindowsでWSLは使っていない。

mainはOMCSessionZMQを使用する。

main2はModelicaSystemを使用する。

from OMPython import ModelicaSystem
from OMPython import OMCSessionZMQ
import pandas as pd
from matplotlib import pyplot as plt

def main():
    """
    <https://openmodelica.org/doc/OpenModelicaUsersGuide/latest/ompython.html#ompython>
    """

    omc = OMCSessionZMQ()
    print(omc.sendExpression("getVersion()"))

    omc.sendExpression("loadModel(Modelica)")
    omc.sendExpression("loadFile(\\"sample.mo\\")")
    result = omc.sendExpression("simulate(myPackage.ex1.myModel, stopTime=10.0, outputFormat=\\"csv\\")")
    print(result)
    df = pd.read_csv("myPackage.ex1.myModel_res.csv", index_col=0)
    plt.figure()
    plt.plot(df.index, df["a"])
    plt.show()

def main2():
    mod=ModelicaSystem("sample.mo","myPackage.ex1.myModel", ["Modelica"])
    print(mod.getParameters())
    mod.setSimulationOptions(["stopTime=10.0","outputFormat=\\"csv\\""])
    mod.simulate()
    df = pd.read_csv("myPackage.ex1.myModel_res.csv", index_col=0)
    plt.figure()
    plt.plot(df.index, df["a"])
    plt.show()

if __name__ == "__main__":
    main()
    print("-----")
    main2()

実行ログ

OpenModelica v1.26.1 (64-bit)
[OMC log for 'sendExpression(simulate(myPackage.ex1.myModel, stopTime=10.0, outputFormat="csv"), True)']: [translation:warning:496] The initial conditions are not fully specified. For more information set -d=initialization. In OMEdit Tools->Options->Simulation->Show additional information from the initialization process, in OMNotebook call setCommandLineOptions("-d=initialization").
{'resultFile': 'C:/Users/mmer547/Documents/openmodelica/myPackage.ex1.myModel_res.csv', 'simulationOptions': "startTime = 0.0, stopTime = 10.0, numberOfIntervals = 500, tolerance = 1e-6, method = 'dassl', fileNamePrefix = 'myPackage.ex1.myModel', options = '', outputFormat = 'csv', variableFilter = '.*', cflags = '', simflags = ''", 'messages': 'LOG_SUCCESS       | info    | The initialization finished successfully without homotopy method.\\nLOG_SUCCESS       | info    | The simulation finished successfully.\\n', 'timeFrontend': 0.1111182, 'timeBackend': 0.0028818, 'timeSimCode': 0.0006119, 'timeTemplates': 0.0104471, 'timeCompile': 0.917712, 'timeSimulation': 0.0777868, 'timeTotal': 1.1208512}
-----
[OMC log for 'sendExpression(buildModel(myPackage.ex1.myModel, variableFilter=".*"), True)']: [translation:warning:496] The initial conditions are not fully specified. For more information set -d=initialization. In OMEdit Tools->Options->Simulation->Show additional information from the initialization process, in OMNotebook call setCommandLineOptions("-d=initialization").
{'k': '10.0', 'm': '1.0'}
c:\\Users\\mmer547\\Documents\\openmodelica\\run_python_to_modelica.py:28: DeprecationWarning: The definition of values to set should use a dictionary, i.e. {'key1': 'val1', 'key2': 'val2', ...}. Please convert all cases which use a string ('key=val') or list ['key1=val1', 'key2=val2', ...]
  mod.setParameters("m=2.0")
{'k': '10.0', 'm': '2.0'}
c:\\Users\\mmer547\\Documents\\openmodelica\\run_python_to_modelica.py:30: DeprecationWarning: The definition of values to set should use a dictionary, i.e. {'key1': 'val1', 'key2': 'val2', ...}. Please convert all cases which use a string ('key=val') or list ['key1=val1', 'key2=val2', ...]
  mod.setSimulationOptions(["stopTime=10.0","outputFormat=\\"csv\\""])

mainの実行で出力されるグラフ

main2の実行で出力されるグラフ

main2は実行されておらず、mainの結果ファイルが読み込まれている。

WindowsでOMPythonを実行するときはOMCSessionZMQ形式を使う必要がある。