Learning Forum

[moansys]

Hi 

I am having trouble initializing Fluent when doing two-way FSI of a water column collapse, I use the mark regions method and set the volume fraction of water to be 1. The simulation works fine when I use fluent alone however when I couple it with transient structural I get errors mainly associated with initializing the flow. 

I tried both standard and hybrid initialization but still doesn't work

[Amine Ben Hadj Ali]

Are you marking the zones or patching likely doing in standalone?

[moansys]

First I mark the region containing water (using region adaptation) then when initializing I patch the water phase giving it a fraction of 1 

The errors I get are 

"Update failed for the Solution component in System Coupling.  The coupled update for system Fluid Flow (Fluent) threw an exception. An error occurred in FLUENT when initializing the flow

An error occurred in FLUENT when initializing the flow"

 

and 

 

"(DP 0) System coupling run completed with errors.  Fluid Flow (Fluent) (Solution 1) reported: Exception encountered when the coupling service requested ChartableData->GetRootLevelName: Communication socket unexpectedly disconnected. Please do not save the project if you would like to recover to the last saved state."

[Amine Ben Hadj Ali]

But how is that patching done if you are doing system coupling?

[moansys]

I just patch it in fluent then connect both fluent and transient structural to system coupling. Not sure if this is the right way to do it in case of FSI.

It works fine if it's just in fluent but it's when I couple I get these errors. 

[Amine Ben Hadj Ali]

Check System Coupling case with Fluent using Patched Data

[moansys]

How do I do that? sorry I am new to CFD and ANSYS

[Rob]

In that case check the online tutorials: there are some with the documentation & others on YouTube. 

[Ryan O'Connor]

If you're going through multiple attempts and running a system coupling simulation, it can be quite tedious to have to re-patch the solution field manually. What I recommend doing is duplicating your Fluent system, moving it above or to the left of the original Fluent system, and patching the duplicated system with the correct values. Then solve it for one iteration (perhaps with equations turned off) so that WB thinks it's up to date. Then, use this solution cell to initialize the FSI Fluent system, by linking the solution cells. Once that's done, whenever you solve the system coupling solution from scratch, Fluent will be initialized from the duplicated system.

[moansys]

Thank you, I can now initialize without any problems. 

[akashme04]

How did you do it? Is there any tutorial. pls send the link