PyMAPDL closes gRPC connection when an error occurs in SOLVE command

[andreiflancanova]

🤓 Before submitting the issue

• I have visited the Troubleshooting section.
• I have searched among the existing issues.
• I am using a Python virtual environment.
• I am using the latest version of PyMAPDL and its dependencies (fully updated virtual environment). You can update them using pip install --upgrade --upgrade-strategy eager ansys-mapdl-core in your activated virtual environment.

🔍 Description of the bug

I am running some nonlinear buckling analysis, and I am facing an issue when an error occurs on Mechanical APDL side: It returns an exception to python and it closes the gRPC connection:

MAPDL server connection terminated unexpectedly while running:
SOLVE,
called by:
_send_command
with the following error
<_InactiveRpcError of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "IOCP/Socket: Connection reset (Unable to retrieve error string -- 10054)"
debug_error_string = "UNKNOWN:Error received from peer {grpc_message:"IOCP/Socket: Connection reset (Unable to retrieve error string -- 10054)", grpc_status:14, created_time:"2024-10-01T13:52:44.5005483+00:00"}"

The error in Mechanical APDL side is this:

*** ERROR *** CP = 94.391 TIME= 10:57:03
Element 1509 has excessive thickness change.

*** ERROR *** CP = 94.484 TIME= 10:57:18
Element 166 has excessive thickness change.

*** WARNING *** CP = 94.484 TIME= 10:57:18
The unconverged solution (identified as time 6390 substep 999999) is
output for analysis debug purposes. Results should not be used for
any other purpose.

In Mechanical APDL GUI I am able to extract results and plot them even after the analysis returns an error. Is there a way to do the same in PyMAPDL?

🕵️ Steps To Reproduce

mapdl.run("/TITLE,phi_0.10_L_2_T_2_k_5.00_SP_192")
mapdl.run("SAVE,,,,ALL")
mapdl.run("/PREP7,")
mapdl.run("KEYW,PR_SET,1")
mapdl.run("KEYW,PR_STRUC,1")
mapdl.run("KEYW,PR_THERM,0")
mapdl.run("KEYW,PR_FLUID,0")
mapdl.run("KEYW,PR_ELMAG,0")
mapdl.run("KEYW,MAGNOD,0")
mapdl.run("KEYW,MAGEDG,0")
mapdl.run("KEYW,MAGHFE,0")
mapdl.run("KEYW,MAGELC,0")
mapdl.run("KEYW,PR_MULTI,0")
mapdl.run("/GO")
mapdl.run("ET,1,SHELL281,,,,,,,")
mapdl.run("MPTEMP,,,,,,,")
mapdl.run("MPTEMP,1,0,,,,,")
mapdl.run("MPDATA,EX,1,,210000.00,,,,,")
mapdl.run("MPDATA,PRXY,1,,0.300,,,,,")
mapdl.run("sect,1,shell")
mapdl.run("SECDATA,18.00,1,0,5,,,,,,,,")
mapdl.run("SECOFFSET,TOP,,,,,,")
mapdl.run("SECCONTROL,,,,,,,,,,,,,")
mapdl.run("sect,2,shell")
mapdl.run("SECDATA,12.00,1,0,5,,,,,,,,")
mapdl.run("SECOFFSET,MID,,,,,,")
mapdl.run("SECCONTROL,0,0,0,0,1,1,1,,,,,,")
mapdl.run("K,1,667.0,0,0")
mapdl.run("K,2,667.0,1000.00,0")
mapdl.run("K,3,667.0,1000.00,58.00")
mapdl.run("K,4,667.0,0,58.00")
mapdl.run("K,5,0,333.0,0")
mapdl.run("K,6,2000.00,333.0,0")
mapdl.run("K,7,2000.00,333.0,58.00")
mapdl.run("K,8,0,333.0,58.00")
mapdl.run("FLST,2,4,3,,")
mapdl.run("FITEM,2,1,,")
mapdl.run("FITEM,2,2,,")
mapdl.run("FITEM,2,3,,")
mapdl.run("FITEM,2,4,,")
mapdl.run("A,P51X,,,,,,,,,,,,,,,,,")
mapdl.run("ASEL,S,LOC,X,660.33,673.67,,")
mapdl.run("tmpvar = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("CM,enrijecedor_transversal, AREA")
mapdl.run("AGEN,2,enrijecedor_transversal,,,667.0,,,,,")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("_tmpvar_ = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("CM,transversais_pre_aptn, AREA")
mapdl.run("FLST,2,4,3,,")
mapdl.run("FITEM,2,5,,")
mapdl.run("FITEM,2,6,,")
mapdl.run("FITEM,2,7,,")
mapdl.run("FITEM,2,8,,")
mapdl.run("A,P51X,,,,,,,,,,,,,,,,,")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("_tmpvar_ = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("ASEL,S,LOC,Y,329.67,336.33,,")
mapdl.run("_tmpvar_ = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("CM,enrijecedor_longitudinal, AREA")
mapdl.run("AGEN,2,enrijecedor_longitudinal,,,,333.0,,,,")
mapdl.run("CMSEL,S,transversais_pre_aptn,")
mapdl.run("ASEL,INVE,AREA,,,,,")
mapdl.run("_tmpvar_ = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("CM,longitudinais_pre_aptn, AREA")
mapdl.run("RECTNG,0,2000.00,0,1000.00")
mapdl.run("CMSEL,S,transversais_pre_aptn,")
mapdl.run("CMSEL,A,longitudinais_pre_aptn,")
mapdl.run("ASEL,INVE,AREA,,,,,")
mapdl.run("_tmpvar_ = wrinqr(1)")
mapdl.run("*GET,_floatparameter_,AREA,,COUNT,,,,,,,")
mapdl.run("ALLSEL,ALL")
mapdl.run("APTN,ALL,,,,,,,,")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("ASEL,S,LOC,X,266.8,400.2,,")
mapdl.run("ASEL,A,LOC,X,933.8,1067.2,,")
mapdl.run("ASEL,A,LOC,X,1600.8,1734.2,,")
mapdl.run("ASEL,R,LOC,Z,-9.0,9.0,,")
mapdl.run("CM,placa_pos_aptn, AREA")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("ASEL,S,LOC,X,266.8,400.2,,")
mapdl.run("ASEL,A,LOC,X,933.8,1067.2,,")
mapdl.run("ASEL,A,LOC,X,1600.8,1734.2,,")
mapdl.run("ASEL,R,LOC,Z,23.2,34.8,,")
mapdl.run("CM,longitudinais_pos_aptn, AREA")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("ASEL,S,LOC,Y,133.20,199.8,,")
mapdl.run("ASEL,A,LOC,Y,466.2,506.16,,")
mapdl.run("ASEL,A,LOC,Y,799.2,839.16,,")
mapdl.run("ASEL,R,LOC,Z,23.2,34.8,,")
mapdl.run("CM,transversais_pos_aptn, AREA")
mapdl.run("ALLSEL,ALL,")
mapdl.run("NUMMRG,ALL,,,,LOW")
mapdl.run("CMSEL,ALL,,")
mapdl.run("MSHAPE,0,2D")
mapdl.run("MSHKEY,0")
mapdl.run("TYPE,1")
mapdl.run("MAT,1")
mapdl.run("REAL")
mapdl.run("ESYS,0")
mapdl.run("SECNUM,1")
mapdl.run("AESIZE,placa_pos_aptn,25.0")
mapdl.run("AMESH,placa_pos_aptn,,")
mapdl.run("TYPE,1")
mapdl.run("MAT,1")
mapdl.run("REAL")
mapdl.run("ESYS,0")
mapdl.run("SECNUM,2")
mapdl.run("AESIZE,transversais_pos_aptn,25.0")
mapdl.run("AMESH,transversais_pos_aptn,,")
mapdl.run("TYPE,1")
mapdl.run("MAT,1")
mapdl.run("REAL")
mapdl.run("ESYS,0")
mapdl.run("SECNUM,2")
mapdl.run("AESIZE,longitudinais_pos_aptn,25.0")
mapdl.run("AMESH,longitudinais_pos_aptn,,")
mapdl.run("FINISH,")
mapdl.run("/SOLU,")
mapdl.run("ANTYPE,0")
mapdl.run("PSTRES,0")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,placa_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("KSLL,S")
mapdl.run("KSEL,S,LOC,X,0,,,")
mapdl.run("KSEL,R,LOC,Y,0,,,")
mapdl.run("CM,kp_inferior_esquerdo, KP")
mapdl.run("DK,kp_inferior_esquerdo,UX,UY,0,0,,,,,")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,placa_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("KSLL,S")
mapdl.run("KSEL,S,LOC,X,0,,,")
mapdl.run("KSEL,R,LOC,Y,1000.00,,,")
mapdl.run("CM,kp_superior_esquerdo, KP")
mapdl.run("DK,kp_superior_esquerdo,UX,0,,,,,,,")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,placa_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("KSLL,S")
mapdl.run("KSEL,S,LOC,X,2000.00,,,")
mapdl.run("KSEL,R,LOC,Y,0,,,")
mapdl.run("CM,kp_inferior_direito, KP")
mapdl.run("DK,kp_inferior_direito,UY,0,,,,,,,")
mapdl.run("")
mapdl.run("")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,placa_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("LSEL,S,LOC,X,0,,,")
mapdl.run("LSEL,A,LOC,X,2000.00,,,")
mapdl.run("LSEL,A,LOC,Y,0,,,")
mapdl.run("LSEL,A,LOC,Y,1000.00,,,")
mapdl.run("LSEL,R,LOC,Z,0,18.00,,")
mapdl.run("CM,lines_contorno_placa, LINE")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,lines_contorno_placa,")
mapdl.run("LSEL,R,LOC,X,0,,,")
mapdl.run("CM,lines_contorno_placa_esquerda, LINE")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,lines_contorno_placa,")
mapdl.run("LSEL,R,LOC,X,2000.00,,,")
mapdl.run("CM,lines_contorno_placa_direita, LINE")
mapdl.run("CMGRP,lines_contorno_placa_ts,lines_contorno_placa_esquerda,lines_contorno_placa_direita,,,,,,")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,lines_contorno_placa,")
mapdl.run("LSEL,R,LOC,Y,0,,,")
mapdl.run("CM,lines_contorno_placa_inferior, LINE")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,lines_contorno_placa,")
mapdl.run("LSEL,R,LOC,Y,1000.00,,,")
mapdl.run("CM,lines_contorno_placa_superior, LINE")
mapdl.run("CMGRP,lines_contorno_placa_ls,lines_contorno_placa_inferior,lines_contorno_placa_superior,,,,,,")
mapdl.run("CMSEL,ALL,,")
mapdl.run("DL,lines_contorno_placa,,UZ,0,")
mapdl.run("allsel,all,all")
mapdl.run("CMSEL,S,transversais_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("LSEL,R,LOC,Y,0,,,")
mapdl.run("CM,lines_borda_ts_inferior, LINE")
mapdl.run("CMSEL,ALL,,")
mapdl.run("CMSEL,S,transversais_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("LSEL,R,LOC,Y,1000.00,,,")
mapdl.run("CM,lines_borda_ts_superior, LINE")
mapdl.run("CMGRP,lines_borda_ts,lines_borda_ts_inferior,lines_borda_ts_superior,,,,,,")
mapdl.run("allsel,all,all")
mapdl.run("CMSEL,S,longitudinais_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("LSEL,R,LOC,X,0,,,")
mapdl.run("CM,lines_borda_ls_esquerda, LINE")
mapdl.run("allsel,all,all")
mapdl.run("CMSEL,S,longitudinais_pos_aptn,")
mapdl.run("LSLA,S")
mapdl.run("LSEL,R,LOC,X,2000.00,,,")
mapdl.run("CM,lines_borda_ls_direita, LINE")
mapdl.run("CMGRP,lines_borda_ls,lines_borda_ls_esquerda,lines_borda_ls_direita,,,,,,")
mapdl.run("CMGRP,lines_borda_enrijecedores,lines_borda_ts,lines_borda_ls,,,,,,")
mapdl.run("allsel,all,all")
mapdl.run("DL,lines_borda_enrijecedores,,UZ,0,")
mapdl.run("allsel,all,all")
mapdl.run("FINISH,")
mapdl.run("SAVE,,,,ALL")
mapdl.run("/SOLU,")
mapdl.run("ASEL,ALL,,,,,,")
mapdl.run("SFL,lines_contorno_placa_ts,PRESS,1.000,,,")
mapdl.run("SFL,lines_contorno_placa_ls,PRESS,1.000000,,,")
mapdl.run("SFL,lines_borda_ls,PRESS,1.000,,,")
mapdl.run("SFL,lines_borda_ts,PRESS,1.000000,,,")
mapdl.run("allsel,all,all")
mapdl.run("SOLVE,")
mapdl.run("FINISH,")
mapdl.run("/SOLU")
mapdl.run("ANTYPE,1")
mapdl.run("BUCOPT,LANB,1,0,0,CENTER")
mapdl.run("MXPAND,1,0,0,0,0.001,,")
mapdl.run("SOLVE,")
mapdl.run("FINISH,")
mapdl.run("SAVE,,,,")
mapdl.run("")
mapdl.run("")
mapdl.run("/POST1")
mapdl.run("SAVE,,,,")
mapdl.run("NSEL,S,NODE,,NODE(1000.0,500.0,0)")
mapdl.run("FINISH,")
mapdl.run("SAVE,,,,")
mapdl.run("/SOLU,")
mapdl.run("allsel,all,all")
mapdl.run("/PREP7,")
mapdl.run("UPGEOM,0.5,LAST,LAST,'file','rst',' '   ")
mapdl.run("TB,BISO,1,1,2,,,")
mapdl.run("TBTEMP,0,")
mapdl.run("TBDATA,,355.00,0.00,,,,")
mapdl.run("/SOL")
mapdl.run("ANTYPE,0")
mapdl.run("NLGEOM,ON")
mapdl.run("PSTRES,1")
mapdl.run("pred,off")
mapdl.run("AUTOTS,ON")
mapdl.run("LNSRCH,on")
mapdl.run("NSUBST,200,400,100,")
mapdl.run("OUTRES,ERASE")
mapdl.run("OUTRES,ALL,ALL")
mapdl.run("TIME,6390")
mapdl.run("NEQIT,100")
mapdl.run("SFL,lines_contorno_placa_ts,PRESS,1980.9,,,")
mapdl.run("SFL,lines_contorno_placa_ls,PRESS,1980.9,,,")
mapdl.run("SFL,lines_borda_ls,PRESS,1980.9,,,")
mapdl.run("SFL,lines_borda_ts,PRESS,1980.9,,,")
mapdl.run("STABILIZE,CONSTANT,energy,0.0001")
mapdl.run("SOLVE,")

💻 Which Operating System are you using?

Windows

🐍 Which Python version are you using?

3.12

💾 Which MAPDL version are you using?

2024R2

📝 PyMAPDL Report

Show the Report!

C:\pymapdl-venv\Lib\site-packages\pyvista\utilities\__init__.py:72: PyVistaDeprecationWarning: The `pyvista.utilities` module has been deprecated. `GPUInfo` is now imported as: `from pyvista.report import GPUInfo`.
  warnings.warn(
-------------------------------------------------------------------------------


PyMAPDL Software and Environment Report


Packages Requirements
*********************

Core packages
-------------
ansys.mapdl.core    : 0.68.4
numpy               : 1.26.4
platformdirs        : 4.3.6
scipy               : 1.14.1
grpc                : Package not found
ansys.api.mapdl.v0  : Package not found
ansys.mapdl.reader  : 0.54.1
google.protobuf     : Package not found

Optional packages
-----------------
matplotlib          : 3.9.2
pyvista             : 0.44.1
pyiges              : 0.3.1
tqdm                : 4.66.5


Ansys Installation
******************
Version   Location
------------------
242       C:\Program Files\ANSYS Inc\ANSYS Student\v242


Ansys Environment Variables
***************************
ANSYS242_DIR                   C:\Program Files\ANSYS Inc\ANSYS Student\v242\ANSYS
AWP_ROOT242                    C:\Program Files\ANSYS Inc\ANSYS Student\v242
CADOE_LIBDIR242                C:\Program Files\ANSYS Inc\ANSYS Student\v242\CommonFiles\Language\en-us

📝 Installed packages

Show the installed packages!

ansys-api-mapdl==0.5.2
ansys-api-platform-instancemanagement==1.1.0
ansys-mapdl-core==0.68.4
ansys-mapdl-reader==0.54.1
ansys-math-core==0.1.5
ansys-platform-instancemanagement==1.1.2
ansys-tools-path==0.6.0
appdirs==1.4.4
asgiref==3.8.1
certifi==2024.8.30
charset-normalizer==3.3.2
click==8.1.7
colorama==0.4.6
contourpy==1.3.0
cycler==0.12.1
Django==5.1.1
django-filter==24.3
djangorestframework==3.15.2
fonttools==4.53.1
geomdl==5.3.1
grpcio==1.66.1
idna==3.10
importlib_metadata==8.5.0
kiwisolver==1.4.7
Markdown==3.7
matplotlib==3.9.2
mysqlclient==2.2.4
numpy==1.26.4
packaging==24.1
pillow==10.4.0
platformdirs==4.3.6
pooch==1.8.2
protobuf==4.25.5
psutil==6.0.0
pyansys-tools-versioning==0.6.0
pyiges==0.3.1
pyparsing==3.1.4
python-dateutil==2.9.0.post0
python-dotenv==1.0.1
pyvista==0.44.1
requests==2.32.3
scipy==1.14.1
scooby==0.10.0
six==1.16.0
sqlparse==0.5.1
tabulate==0.9.0
tqdm==4.66.5
typing_extensions==4.12.2
tzdata==2024.1
urllib3==2.2.3
vtk==9.3.1
zipp==3.20.2

📝 Logger output file

Show the logger output file.

# PASTE HERE THE CONTENT OF THE LOGGER OUTPUT FILE.