{"id":302595,"date":"2023-08-21T19:02:14","date_gmt":"2023-08-21T19:02:14","guid":{"rendered":"\/forum\/forums\/topic\/2-way-fsi-structural-and-cfx-issue-in-ansys-2023r1-and-2023r2\/"},"modified":"2023-09-22T18:57:45","modified_gmt":"2023-09-22T18:57:45","slug":"2-way-fsi-structural-and-cfx-issue-in-ansys-2023r1-and-2023r2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/2-way-fsi-structural-and-cfx-issue-in-ansys-2023r1-and-2023r2\/","title":{"rendered":"System Coupling hostname issue in ANSYS 2023R1 and 2023R2"},"content":{"rendered":"

I’m running a 2-way FSI problem consisting of the transient flow in a carotid bifurcation geometry. I’m using CFX as the flow solver. The simulations run on a local workstation accessing the Ansys license on a remote license server.<\/p>\n

I can confirm that my setup is correct and that the license server can be accessed since my simulations run flawlessly in ANSYS 2022R2 using System Coupling in workbench or the System Coupling GUI outside workbench. My issues started with 2023R1. After creating the same exact setup, System Coupling is unable to connect the participants and exits with the folowing error message:<\/p>\n

waiting connections from coupling participants…<\/em><\/span>
+—————————————————————————–+<\/em><\/span>
| “System coupling solution stopped before all participants connected. A      |<\/em><\/span>
| solver failure occurred during the run in the Fluid Flow (CFX) system”      |<\/em><\/span>
+—————————————————————————–+<\/em><\/span>
Traceback (most recent call last):<\/em><\/span>
  File “PyLib\\cosimulation\\solver\\__init__.py”, line 149, in solve<\/em><\/span>
  File “PyLib\\kernel\\util\\Memory.py”, line 208, in wrapper<\/em><\/span>
  File “PyLib\\cosimulation\\solver\\__init__.py”, line 541, in __startParticipantsControlled<\/em><\/span>
  File “PyLib\\cosimulation\\participantmanager\\participantManager.py”, line 401, in startParticipants<\/em><\/span>
cosimulation.solver.CosimulationError.CosimulationError: “System coupling solution stopped before all participants connected. A solver failure occurred during the run in the Fluid Flow (CFX) system”<\/em><\/span><\/p>\n

Looking at the CFX log, the inability to connect all participants seems to be related to the following issue:<\/span><\/p>\n

” ERROR #001100279 has occurred in subroutine ErrAction.             |
 | Message:                                                           |
 | ANSYS CFX is unable to connect to the system coupling service on   |
 | DESKTOP-IFHHT69.Kennesaw.EDU through port 51268. Please ensure th- |
 | at the host name and the port number are correct.”<\/em><\/span><\/p>\n

There seems to be a mismatch between the hostname used by System Coupling (i.e., DESKTOP-IFHHT69.Kennesaw.EDU) and the hostname used by CFX (i.e., DESKTOP-IFHHT6). The correct hostname is the one reported by CFX. The domain added by System Coupling (.Kennesaw.EDU) should not be part of the hostname. <\/span><\/p>\n

With the release of 2023R2, I was hoping that this issue would disappear. Unfortunately, after installing 2023R2 today and setting up the same model again, I still obtain the same error message. As a result, I removed 2023R2 and reinstalled 2022R2. I can confirm that the simulations work with no error message and that system coupling is able to connect all participants in this older release. I can also confirm that, with this older release, the correct hostname (DESKTOP-IFHHT6) is used by both CFX and System Coupling.  <\/span><\/p>\n

    \n
  1. Why are both 2023 releases unable to run a model that was successful in 2022R2? Any troubleshooting suggestions are welcome.<\/span><\/li>\n
  2. If the issue is truly related to the fact that System Coupling, for some reason, uses an incorrect hostname, how can I manually input the correct hostname in System Coupling prior to running a simulation? Running the System Coupling GUI outside workbench did not resolve the issue.<\/span><\/li>\n<\/ol>\n","protected":false},"template":"","class_list":["post-302595","topic","type-topic","status-closed","hentry","topic-tag-ansys-cfx","topic-tag-system-coupling"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["2379","157473"],"_bbp_author_ip":["23.206.193.154"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1803"],"_edit_lock":["1692711716:219128"],"_bbp_status":["publish","publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["302595"],"_bbp_forum_id":["27792"],"_bbp_engagement":["2379","157473"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["308155"],"_bbp_last_active_id":["308155"],"_bbp_last_active_time":["2023-09-22 18:50:11"]},"test":"psucoskykennesaw-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/302595","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/302595\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=302595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}