Learning Forum

[Zuz Kun]

Hello, I am preparing a bidirectional FSI analysis (Fluent + Mechanical) I got this error package:
Update failed for the Solution component in System Coupling. The coupled update for system Fluent threw an exception. Update Solution Failed
(DP 0) An unknown error occurred during solution. Check the Solver Output on the Solution Information object for possible causes.
(DP 0) A solver failure occurred during the run in the Fluent system
(DP 0) Error when making a remote call to participant Solution 1. Please do not save the project if you would like to recover to the last saved state.
(DP 0) Error when making a remote call to participant Solution 1. Please do not save the project if you would like to recover to the last saved state.

There is absolutely no more explanation in Solution Information. What could it be? I need help, I'm on a tight deadline.

[Rahul]

Hello,

Please refer to the fluent transcript file to know more about the issue. As error suggests solver failure occurred during the run in the Fluent system. Make changes in fluent setup to avoid that error.

Hope this helps!

[Zuz Kun]

The content of the transcript file is as follows:

Transcript Start Time: 14:42:14, 30 Jun 2023 Central European Summer Time
Current Directory: "D:\butterfly_files\dp0\FLU-6\Fluent"

Build Time: May 27 2022 08:52:29 EDT
Executable Path: C:/PROGRA~1/ANSYSI~1/v222/fluent/ntbin/win64/fluent.exe

-------------------------------------------------- ------------------------------------------------
ID Hostname Core O.S. PID Vendor
-------------------------------------------------- ------------------------------------------------
n0* DESKTOP-MLO6B2Q 1/16 Windows-x64 10556 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz
host DESKTOP-MLO6B2Q Windows-x64 14712 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz

MPI Option Selected: intel
Selected system interconnect: default
-------------------------------------------------- ------------------------------------------------

Cortex Process ID: 5296
License Server Path: 1055@localhost
(cx-gui-do cx-activate-item "MenuBar*FileMenu*Close Fluent")

Performance Timer for 0 iterations on 1 compute node
   Average wall-clock time per iteration: 0.000 sec
   Global reductions per iteration: 0 ops
   Global reductions time per iteration: 0.000 sec (0.0%)
   Message count per iteration: 0 messages
   Data transfer per iteration: 0.000 MB
   LE solves per iteration: 0 solves
   LE wall-clock time per iteration: 0.000 sec (0.0%)
   LE global solves per iteration: 0 solves
   LE global wall-clock time per iteration: 0.000 sec (0.0%)
   LE global matrix maximum size: 0
   AMG cycles per iteration: 0.000 cycles
   Relaxation sweeps per iteration: 0 sweeps
   Relaxation exchanges per iteration: 0 exchanges
   LE early protections (stall) per iteration: 0.000 times
   LE early protections (divergence) per iteration: 0.000 times
   Total SVARS touched: 363

   Total wall-clock time: 0.000 sec

Transcript Stop Time: 14:42:38, 30 Jun 2023 Central European Summer Time
Total Transcript Time: 0 Minutes 24 Seconds.

I still don't know what to do with it.

[Rahul]

Could you please share the content of the system coupling log file as well as mechanical solution output file?

[Rahul]

Before solving the two-way FSI make sure that individual participant works well. You can use representative load on system coupling boundary.
Also refer to this tutorial Reed Valve FSI Co-Simulation with Partial Setup Export from Workbench (Fluent-Mechanical) (ansys.com) and see if the settings and boundary condition are correctly defined.