Learning Forum

[Ioannis]

Hi,

I am running a simulation in Ansys Fluent (2022 R2), and at some point, it raises the following error:

Unexpected error in GuiOperationMetaData callback for Claim. The operation will be disabled for the remainder of this session: Destination array is not long enough to copy all the items in the collection. Check array index and length.

The simulation continues normally, but in the end, no results are saved. Has anybody ever experienced that?

Thanks!

[Rob]

That's new. What were you doing when it failed? 

[Ioannis]

 

Well, it is a rather simple simulation. I have a variable heat source on a boundary, and I simulate the heat transfer through a solid for 25 years (with an 8-hour timestep).

What I noticed is that if I save the results infrequently (e.g., every 40 timesteps), I don’t get this error. However, if I save after every timestep, I do. Does this make sense?

 

[Rob]

I suspect you're running out of RAM or disc space.  Why are you using CFD for this? Mechanical would be far more compute efficient. 

[Ioannis]

I definitely have enough disc space. Not sure about RAM (I have 32 GB)...

I have never used Mechanical, but if you think it might solve my problem, I will give it a go! Thanks!

[Rob]

You're welcome.  32GB RAM ought to be sufficient (mesh depending) but all the disc I/O might be causing a memory leak somewhere. 

Mechanical is fairly easy (my colleagues who support it will disagree) so just run through the tutorials. Overall, it's always best to have a look at what you need from a simulation then choose the best tool. Pencil, paper and a calculator may be better than a full CFD model in some cases.