Learning Forum

[HB Z]

I use Workbench for fluid-structure interaction, when the transient structure module is calculated, the fluid will stay in this state for a long time, how should I submit the data exchange speed between the two modules?

[RM]

Hello,

Do you see any warning/ error in System coupling log file/ mechanical output file?

Is it showing the same behaviour in standalone system coupling as well? 

[HB Z]

I didn't find any error or warning in the log file. When I reduced the number of cores used by fluent, this situation seems to improve, what is the reason for this?

[RM]

Is this same behavior observed with system coupling outside workbench? 

System coupling outside WB is more flexible and robust approach.

Please refer Reed Valve FSI Co-Simulation with Partial Setup Export from Workbench (Fluent-Mechanical) (ansys.com) to know more about it. 

[HB Z]

Recently, I set up such a fluid-structure two-way coupling analysis, when I pause the simulation  and change the step size and the maximum iterations in the system coupling, and then simulate again, I found that the displacement of the monitor point in the transient structure would deviate from the original trend. The fluent will report an error "Deleting Client...done
Shutting down Server...done Error: Rpc Communication failure during SCAnalysis:GetCouplingDefinitionMethod call at cortexmpc,c:423", followed by a flashback, and finally the simulation stops unexpectedly. I tried not to change any settings, just paused the simulation process, and when I hit the Continue Calculation button in the System Coupling, I also got an error and could not continue.

[RM]

If you have paused the simulation and want to continue to run further. 

Follow the procedure shown in following video to restart the run: Restarting a Coupled Analysis in Fluent and Mechanical - YouTube

Hope this helps!

[HB Z]

thank you for your help