{"id":276641,"date":"2023-03-27T15:29:59","date_gmt":"2023-03-27T15:29:59","guid":{"rendered":"\/forum\/?post_type=topic&p=276641"},"modified":"2023-03-27T15:29:59","modified_gmt":"2023-03-27T15:29:59","slug":"transient-cfx-simulation-crashing-on-write","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-cfx-simulation-crashing-on-write\/","title":{"rendered":"Transient CFX simulation crashing on write"},"content":{"rendered":"

I am running CFX 2022R2 on Ubuntu 20.04LTS. I am running some transient (URANS) simulations involving a mixture of hydrogen and air, and have encountered a problem where the solution seems to proceed normally for some time, but then eventually stops with an error at the point it attempts to write results out. What is particularly strange though, is that it does not fail immediately – here is an example of the error in the output log for one simulation, where it fails on writing out at timestep 282. This simulation was running fine until this point, and has been writing out transient results files (which are fine) for every even timestep until this point. There is no indication that anything is wrong in the log before this point.<\/p>\n

+——————————————————————–+<\/span>
 | Writing transient file 282_full.trn                                |<\/span>
 |   Name   : Transient Results 1                                     |<\/span>
 |   Type   : Standard                                                |<\/span>
 |   Option : Timestep Interval                                       |<\/span>
 +——————————————————————–+<\/span>
 +——————————————————————–+<\/span>
 | Notice: The maximum Mach number is  3.502E+00.                     |<\/span>
 +——————————————————————–+<\/span>
Partition:    10<\/span>
  1 SU_HYBARR, ,VISCTRB_FL1,ZN1                 \/VERTICES,LATEST<\/span>
  2 cal_VISC_TRB,LIN-LIN,DENSITY_FL1,BELG5\/IP,LATEST<\/span>
  3 cal_VISC_TRB, ,TKE_FL1,BELG5\/IP,LATEST<\/span>
  4 SU_HYBARR, ,MASCON_MT1_FL1,ZN1                 \/VERTICES,LATEST<\/span>
  5 SU_HYBARR, ,MASCON_MT4_FL1,ZN1                 \/VERTICES,LATEST<\/span>
 <\/span>
 +——————————————————————–+<\/span>
 | ERROR #001100279 has occurred in subroutine ErrAction.             |<\/span>
 | Message:                                                           |<\/span>
 | Stopped in routine TRCPRT                                          |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 +——————————————————————–+<\/span><\/p>\n

 +——————————————————————–+<\/span>
 |                An error has occurred in cfx5solve:                 |<\/span>
 |                                                                    |<\/span>
 | The ANSYS CFX solver exited with return code 1.   No results file  |<\/span>
 | has been created.                                                  |<\/span>
 +——————————————————————–+<\/span><\/p>\n

End of solution stage.<\/p>\n

In an attempt to narrow down the problem, I have taken this simulation and resumed it (by which I mean using the option Execution Control>Initial Values Control>Continue History From<\/span>) from timestep 280 (the last successful .trn file).If Output Control><\/span><\/span><\/span><\/span><\/span>Transient Results<\/span> is not removed, then the simulation crashes at the same point as above with the same error output. If Output Control>Transient Results<\/span> is disabled, the simulation continues to run successfully past this point. While running, if the Save\/Create Backup<\/span> button is pressed in the CFX Solver manager, it once again crashes with similar output – for example:<\/span><\/span><\/span>
<\/span><\/p>\n

 +——————————————————————–+<\/span>
 | Writing backup file 306_full.bak                                   |<\/span>
 |   Name   : Requested from solver manager or command line           |<\/span>
 |   Type   : Standard                                                |<\/span>
 |   Option : End of current iteration                                |<\/span>
 +——————————————————————–+<\/span>
 +——————————————————————–+<\/span>
 | Notice: The maximum Mach number is  6.738E+00.                     |<\/span>
 +——————————————————————–+<\/span>
Partition:    10<\/span>
  1 SU_HYBARR, ,MASCON_MT1_FL1,ZN1                 \/VERTICES,LATEST<\/span>
  2 SU_HYBARR, ,MASCON_MT4_FL1,ZN1                 \/VERTICES,LATEST<\/span>
Partition:    11<\/span>
  1 SU_HYBARR, ,MASCON_MT1_FL1,ZN1                 \/VERTICES,LATEST<\/span>
  2 SU_HYBARR, ,MASCON_MT4_FL1,ZN1                 \/VERTICES,LATEST<\/span>
 <\/span>
 +——————————————————————–+<\/span>
 | ERROR #001100279 has occurred in subroutine ErrAction.             |<\/span>
 | Message:                                                           |<\/span>
 | Stopped in routine TRCPRT                                          |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 |                                                                    |<\/span>
 +——————————————————————–+<\/span><\/p>\n

 +——————————————————————–+<\/span>
 |                An error has occurred in cfx5solve:                 |<\/span>
 |                                                                    |<\/span>
 | The ANSYS CFX solver exited with return code 1.   No results file  |<\/span>
 | has been created.                                                  |<\/span>
 +——————————————————————–+<\/span><\/p>\n

End of solution stage.<\/span><\/p>\n

It therefore looks like the issue lies with writing the results out rather than with the solution itself; please could you advise? I do not have any ideas how to proceed with debugging further at this stage.<\/p>\n","protected":false},"template":"","class_list":["post-276641","topic","type-topic","status-closed","hentry","topic-tag-ansys-cfx","topic-tag-cfx"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["96.7.74.173"],"_bbp_subscription":["10504","68667","22555"],"_btv_view_count":["1849"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["276641"],"_bbp_forum_id":["27792"],"_bbp_engagement":["10504","22555","68667"],"_bbp_voice_count":["3"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["277786"],"_bbp_last_active_id":["277786"],"_bbp_last_active_time":["2023-04-04 09:57:22"]},"test":"brian-tangeng-ox-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/276641","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\/276641\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=276641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}