How to solve explicit dynamics analysis in Ansys 2023R1 on Linux?

wanghao
wanghao Member Posts: 27
First Comment Name Dropper
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in General Language Questions

Hi
I'm trying to solve an explicit dynamics analysis on Linux with pyMechanical but it seems not start solve.

Here's my python script:

import ansys.mechanical.core as pymechanical

wb_path = "/es01/home/zssoftware/Ansys/Ansys2023r1_gr/v231/aisol/.workbench"
print("wb_path", wb_path)
mechanical = pymechanical.launch_mechanical(exec_file=wb_path, verbose_mechanical=True, batch=True, loglevel="DEBUG", log_file=True, log_mechanical="pymechanical")
print("mechanical launch success: ", mechanical)

project_directory = mechanical.project_directory
print(f"project directory = {project_directory}")

try:
    # import geometry file
    GEO_IMPORT_SCRIPT = """
geo_import_format = Ansys.Mechanical.DataModel.Enums.GeometryImportPreference.Format.Automatic
geo_import_preferences = Ansys.ACT.Mechanical.Utilities.GeometryImportPreferences()
geo_import = Model.GeometryImportGroup.AddGeometryImport()
geo_import.Import("{geo_path:s}", geo_import_format, geo_import_preferences)
"""
    mechanical.run_python_script(
      GEO_IMPORT_SCRIPT.format(geo_path="/es01/home/yuansuan/test_case/wanghao/ansys-231-pre-process/breakage/breakage.stp")
    )

    # mesh
    mechanical.run_python_script("""
mesh_14 = Model.Mesh
mesh_14.ElementSize = Quantity(1, "m")
mesh_14.PhysicsPreference = MeshPhysicsPreferenceType.Explicit
mesh_14.GenerateMesh()
"""
    )

    mechanical.run_python_script("""
# set ExplicitDynamicsAnalysis
explicit_dynamics_analysis = Model.AddExplicitDynamicsAnalysis()

def analysis_settings(p, value):
    pro = DataModel.AnalysisList[0].AnalysisSettings.PropertyByName(p)
    print("find %s propertry is ok, old value is %f " % (p, pro.InternalValue))
    pro.InternalValue=value
    print("update %s propertry is ok, new value is %f " % (p, pro.InternalValue))

analysis_settings("StepEndTime", 0.0001)

fixed_support = explicit_dynamics_analysis.AddFixedSupport()
selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Ids = [88, 94, 91]
fixed_support.Location = selection

displacement = explicit_dynamics_analysis.AddDisplacement()
selection = ExtAPI.SelectionManager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Ids = [90, 93, 86]
displacement.Location = selection

displacement.XComponent.Output.DefinitionType=VariableDefinitionType.Discrete
displacement.XComponent.Inputs[0].DiscreteValues = [Quantity(0, 'sec'), Quantity(1, 'sec')]
displacement.XComponent.Output.DiscreteValues = [Quantity(0, 'mm'), Quantity(-10, 'mm')]

explicit_dynamics_analysis.Solution.AddEquivalentStress()
explicit_dynamics_analysis.Solution.AddTotalDeformation()
""")


    mechanical.run_python_script("""
Model.Solve(True)
""")

except Exception as e:
    print("An error occurred while running the Python script:", e)
finally:
    print("exit mechanical instance")
    mechanical.exit()

The solution seems not starts and I've got two warnings. Here's the stdout when running the script:

wb_path /es01/home/zssoftware/Ansys/Ansys2023r1_gr/v231/aisol/.workbench
Running /es01/home/zssoftware/Ansys/Ansys2023r1_gr/v231/aisol/.workbench -DSApplet -b -AppModeMech -grpc 10000.
INFO - GRPC_127.0.0.1:10000 -  mechanical - log_info - Mechanical connection is treated as local.
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - timetout:120 n_attempts:5 attempt_timeout=24.0
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - Connection attempt 1 with attempt timeout 24.0s
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - Connection attempt 2 with attempt timeout 24.0s
Initialize() started
Initialize() done
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - Established a connection to the Mechanical gRPC server.
INFO - GRPC_127.0.0.1:10000 -  mechanical - log_info - Waiting for Mechanical to be ready. Maximum wait time: 24.0s
INFO - GRPC_127.0.0.1:10000 -  mechanical - log_info - Mechanical is ready. It took 0 seconds to verify.
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - Connection attempt 2 succeeded.
INFO - GRPC_127.0.0.1:10000 -  mechanical - log_info - Mechanical is ready to accept grpc calls
mechanical launch success:  Ansys Mechanical [Ansys Mechanical Enterprise]
Product Version:231
Software build date:Sat Nov 26 20:15:28 2022
project directory = /tmp/AnsysMech8DD1/Project_Mech_Files/
AnsMeshingServer, compiled Nov 26 2022 21:20:33, DS Mesher, Thu May 30 19:36:43 2024
AnsMeshingServer, okay, Thu May 30 19:36:44 2024
exit code: 255
find StepEndTime propertry is ok, old value is 0.000000 
update StepEndTime propertry is ok, new value is 0.000100 
Warning at File: myxml, line 1, col 40, encoding 'utf-16' from XML declaration or manually set contradicts the auto-sensed encoding; ignoring
Warning at File: myxml, line 1, col 40, encoding 'utf-16' from XML declaration or manually set contradicts the auto-sensed encoding; ignoring
exit mechanical instance
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - In shutdown.
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - Shutting down...
DEBUG - GRPC_127.0.0.1:10000 -  mechanical - log_debug - No PyPIM cleanup is needed.
INFO - GRPC_127.0.0.1:10000 -  mechanical - log_info - Shutdown has finished.
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