Unable to solve .inp file using pymapdl

Shailesh Kumar

Hi, I am trying to access a mechanical model and change the co-eff of friction for contact. But while doing so I am not able to solve the .inp file which I created from mechanical. Can anyone help me with this. The error says "SOLVE is not a recognized BEGIN command"

My code is as below:

from ansys.mapdl.core import launch_mapdl
import numpy as np
#import matplotlib.pyplot as plt
mapdl = launch_mapdl()
print(mapdl)
mapdl.input("D:\ACT\PyAnsys\PyAnsys_2021R2\X_Demo_Ansys_File\model1_input.inp")

# Change the friction coefficient for contact pair with ID 1 to 0.3
#mapdl.cmcoeff(1, "FRICTION", 0.3)

# Solve the model
#mapdl.slashsolu()
#mapdl.solve()
#mapdl.finish()

output = mapdl.solve()

print(output)

#result.plot_principal_nodal_stress(0,'seqv',background='w',show_edges=True,text_color='k',add_text=True)

mapdl.exit

Pernelle Marone-Hitz

Hi @Shailesh Kumar . The issue is related to your last solve() command. As it is issued after finish() command, you're not in a processor where solve() command is recognized. You'll need to enter /solu before issuing that solve command. This is not really related to PyMAPDL, but more to MAPDL itself.

Shailesh Kumar

Hey, Thanks for the reply and sorry for the confusion but those lines are actually commented. Below is the complete code which is giving the error. It would be great if you could help!

"from ansys.mapdl.core import launch_mapdl

import numpy as np

mapdl = launch_mapdl()

print(mapdl)

mapdl.input("D:\ACT\PyAnsys\PyAnsys_2023R1\X_Demo_Ansys_File\model1_input.inp")

output = mapdl.solve()

print(output)

mapdl.exit"

Pernelle Marone-Hitz

Can you check what is inside model1_input.inp ? Most probably it exits the /solu processor there and then when you try to solve you get this error.

Shailesh Kumar

I am getting this as error message - If you could find something with this, there is no /solu in my inp file

CRITICAL - pymapdl_global - logging - handle_exception - Uncaught exception
Traceback (most recent call last):
File "d:\ACT\PyAnsys\PyAnsys_2023R1\dynCoF_2023-09-05_release0p7\dynCoF_2023-09-05_release0p7\Try.py", line 16, in
output = mapdl.solve()
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core_commands\solution\analysis_options.py", line 3450, in solve
return self.run(command, **kwargs)
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core\mapdl.py", line 3310, in run
self._raise_errors(text)
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core\mapdl.py", line 4443, in _raise_errors
raise MapdlInvalidRoutineError(text)
ansys.mapdl.core.errors.MapdlInvalidRoutineError: *** WARNING *** CP = 0.781 TIME= 15:06:58
SOLVE is not a recognized BEGIN command, abbreviation, or macro. This
command will be ignored.

Ignore these messages by setting 'ignore_errors'=True
CRITICAL:pymapdl_global:Uncaught exception
Traceback (most recent call last):
File "d:\ACT\PyAnsys\PyAnsys_2023R1\dynCoF_2023-09-05_release0p7\dynCoF_2023-09-05_release0p7\Try.py", line 16, in
output = mapdl.solve()
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core_commands\solution\analysis_options.py", line 3450, in solve
return self.run(command, **kwargs)
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core\mapdl.py", line 3310, in run
self._raise_errors(text)
File "D:\ACT\PyAnsys\PyAnsys_2023R1.venv\lib\site-packages\ansys\mapdl\core\mapdl.py", line 4443, in _raise_errors
raise MapdlInvalidRoutineError(text)
ansys.mapdl.core.errors.MapdlInvalidRoutineError: *** WARNING *** CP = 0.781 TIME= 15:06:58
SOLVE is not a recognized BEGIN command, abbreviation, or macro. This
command will be ignored.

James Derrick

Hi @Shailesh Kumar, welcome and thanks for posting! We use markdown on the forum, and I've formatted your first post to read a bit better as Python code. You can check more out about the forum here https://discuss.ansys.com/discussion/1848/welcome-please-read-before-posting#latest

Pernelle Marone-Hitz

This is the problem - solve command is understood in /solu processor. So you need to enter it before issuing the solve command. At the moment when you are issuing the solve command you are still in the begin processor.

Shailesh Kumar

Hi, Thanks for help! its working now