FLUENT named expression using pyfluent #3760

som1197 · 2025-02-20T23:44:37Z

som1197
Feb 20, 2025

Hello,

I am trying to define the following named expression using pyfluent.

import ansys.fluent.core as pyfluent
session = pyfluent.launch_fluent(precision="double", processor_count=16, version="Dimension.THREE", ui_mode="gui")
session.tui.define.named_expressions.add("mfr_inlet_outlet")
session.tui.define.named_expressions.edit("mfr_inlet_outlet","definition","abs(abs({mfr_in})-abs(({mfr_out})))")

This gives me the following error

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
Cell In[30], line 2
      1 session.tui.define.named_expressions.add("mfr_inlet_outlet")
----> 2 session.tui.define.named_expressions.edit("mfr_inlet_outlet","definition","abs(abs({mfr_in})-abs(({mfr_out})))")

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\datamodel_tui.py:342, in TUIMethod.__call__(self, *args, **kwargs)
    341 def __call__(self, *args, **kwargs):
--> 342     return PyMenu(self._service, self._version, self._mode, self._path).execute(
    343         *args, **kwargs
    344     )

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\datamodel_tui.py:268, in PyMenu.execute(self, *args, **kwargs)
    266     return self._service.execute_query(self._path, *args, **kwargs)
    267 else:
--> 268     return self._service.execute_command(self._path, *args, **kwargs)

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\datamodel_tui.py:179, in DatamodelService.execute_command(self, path, *args, **kwargs)
    177 else:
    178     _convert_value_to_gvalue(args, request.args.fields["tui_args"])
--> 179 return self._impl.execute_command(request)

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\datamodel_tui.py:89, in DatamodelServiceImpl.execute_command(self, request)
     85 def execute_command(
     86     self, request: DataModelProtoModule.ExecuteCommandRequest
     87 ) -> DataModelProtoModule.ExecuteCommandResponse:
     88     """ExecuteCommand RPC of DataModel service."""
---> 89     return self._stub.ExecuteCommand(request, metadata=self._metadata)

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\grpc\_interceptor.py:277, in _UnaryUnaryMultiCallable.__call__(self, request, timeout, metadata, credentials, wait_for_ready, compression)
    268 def __call__(
    269     self,
    270     request: Any,
   (...)
    275     compression: Optional[grpc.Compression] = None,
    276 ) -> Any:
--> 277     response, ignored_call = self._with_call(
    278         request,
    279         timeout=timeout,
    280         metadata=metadata,
    281         credentials=credentials,
    282         wait_for_ready=wait_for_ready,
    283         compression=compression,
    284     )
    285     return response

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\grpc\_interceptor.py:329, in _UnaryUnaryMultiCallable._with_call(self, request, timeout, metadata, credentials, wait_for_ready, compression)
    326     except Exception as exception:  # pylint:disable=broad-except
    327         return _FailureOutcome(exception, sys.exc_info()[2])
--> 329 call = self._interceptor.intercept_unary_unary(
    330     continuation, client_call_details, request
    331 )
    332 return call.result(), call

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\interceptors.py:172, in GrpcErrorInterceptor.intercept_unary_unary(self, continuation, client_call_details, request)
    165 def intercept_unary_unary(
    166     self,
    167     continuation: Any,
    168     client_call_details: grpc.ClientCallDetails,
    169     request: Any,
    170 ) -> Any:
    171     """Intercept unary-unary call for error state checking."""
--> 172     return self._intercept_call(continuation, client_call_details, request)

File c:\Users\CFD\AppData\Local\Programs\Python\Python313\Lib\site-packages\ansys\fluent\core\services\interceptors.py:162, in GrpcErrorInterceptor._intercept_call(self, continuation, client_call_details, request)
    158     new_ex = new_ex_cls(
    159         ex.details() if isinstance(ex, grpc.RpcError) else str(ex)
    160     )
    161     new_ex.__context__ = ex
--> 162     raise new_ex from None
    163 return response

RuntimeError: fromScheme: string
Error Object: #f

It generates this expression correctly using the setup class

session.setup.named_expressions.create(name = "mfr_total")
session.setup.named_expressions['mfr_total'].definition = "abs(abs({mfr_in})-abs(({mfr_out})))"

Is there a different way of using the TUI based command?