Learning Forum

[fares abbara]

So i have been working for a while on an FSI model for a bifurcating tube with cyclic loading on the outer surface. I have recently managed to get my system going successfully. However, due to high computational time i had to run my model on an HPC service provided by my university. when my model ran i was working on ansys 2023, however the HPC has the 2021 version. To work my way around the issue i redid my model on ansys 19.2 on the university on computers and tried running it on 2021 version on the HPC. Unfortunately the model did not run and i recieved the error message specified in the title of this post. what could the issue possibly be? 

Moreover, i tried running the model again on the 2023 version and i recieved that error as well.

[Federico Alzamora Previtali]

Hello Fares, 

Are you running intrinsic FSI from Fluent or via Systems Coupling? why is your model not running anymore on 23R1? Can you share more text from the transcript/console to provide more context as to where your simulation fails?

[fares abbara]

Hello Federico,

Thank you for your reply.

I am running my FSI using system coupling. When i reran my model on 23R it was the same error message as 19.2. Here is the text i got after analysis initialization.

+=============================================================================+

|                                                                             |

|                           Analysis Initialization                           |

|                                                                             |

+=============================================================================+

===============================================================================

 

Traceback (most recent call last):

  File "PyLib/kernel/remote/RemoteObjects.py", line 28, in _nodeCaller

  File "PyLib/physicscoupling/importer/Importer.py", line 36, in setExistingConnection

RuntimeError: Low-level communication error -15: Connection was closed

 

 

+-----------------------------------------------------------------------------+

| Low-level communication error -15: Connection was closed                    |

+-----------------------------------------------------------------------------+

Traceback (most recent call last):

  File "PyLib/main/Controller.py", line 147, in

  File "PyLib/main/Controller.py", line 143, in _run

  File "PyLib/main/Controller.py", line 92, in _executeScript

  File "PyLib/kernel/commands/__init__.py", line 31, in readScriptFile

  File "PyLib/kernel/commands/CommandManager.py", line 169, in readScriptFile

  File "wb2cosim.py", line 4, in

    Solve()

  File "PyLib/kernel/commands/CommandDefinition.py", line 74, in func

  File "PyLib/kernel/commands/__init__.py", line 28, in executeCommand

  File "PyLib/kernel/commands/CommandManager.py", line 122, in executeCommand

  File "PyLib/cosimulation/externalinterface/core/solver.py", line 125, in execute

  File "PyLib/cosimulation/solver/__init__.py", line 123, in solve

  File "PyLib/kernel/util/Memory.py", line 177, in wrapper

  File "PyLib/cosimulation/solver/__init__.py", line 519, in __initializeControlled

  File "PyLib/cosimulation/participantmanager/AnsRpcParticipant.py", line 151, in initializeOutputs

  File "PyLib/physicscoupling/importer/__init__.py", line 93, in setExistingConnection

  File "PyLib/kernel/remote/RemoteObjects.py", line 45, in func

  File "PyLib/ComputeNodeCommand.py", line 94, in newfunc

  File "PyLib/ComputeNodeCommand.py", line 70, in raiseException

RuntimeError: Low-level communication error -15: Connection was closed

Shutting down System Coupling compute node processes.