Learning Forum

[Isita]

Hello, 

 

I am trying to mesh a geometry but I keep getting the following error "The process suffered an unhandled exception or ran out of memory". I found out that someone else encountered the same issue https://forum.ansys.com/forums/topic/problems-meshing-running-out-of-usable-memory/ but it did not help me solve my problem. I used the repair tools in Spaceclaim (it did not find any problematic feature) and as to virtual topology, the tools were all grayed out. Ultimately, I am trying to run a conjugate analysis, I have many fillets in my geometry and used shared topology in Spaceclaim. I am using a research license of Ansys 19.0 and the sizing function I want to use in Proximity and curvature. I also tried just using curvature but the issue remained the same.

 I tried to attach my file but the archive exceeds 120MB and the .xt file is about 200MB... is there an alternative?

Thanks

[peteroznewman]

If you have a Gmail account, then you have a Google drive.  If you were to attach the archive to a Gmail email, it would upload it to your Google drive and put a link in your email.  You can copy that link and paste it into your reply.  The same applies to Microsoft OneDrive.

[Isita]

Thank you, here is the link

https://drive.google.com/file/d/1y0Ht79tNXmfVheY3EWiFKJy8H57_EamP/view?usp=sharing

[peteroznewman]

Here is a closeup image of the fluid.

This is a very large complex solid body. It's not surprising that you are running out of memory.

The height of the solid is 100 mm

Here is a 1.4 mm thick slice of the solid, which is 1.4% of the fluid volume.

This 1.4% slice has 2.2 million cells. I have a feeling the full fluid region is too large to mesh.

Note that this is just the fluid volume, there is the solid body you wanted around this fluid.

See what some of the ANSYS staff have to say about this model.

[Rob]

That's something we'd use a periodic flow for, or porous media.  If you can remove the circle contacts on the flat face (reduce the chamfer) you'll also improve the mesh as you won't be trying to resolve an artificially small gap/tangential edge contact. 

What are you trying to model? Ie what is it and what do you want to know? 

[Isita]

Sorry for the late reply. I am trying to model a heat exchanger with pin fin features in the plate. I will reduce the size of the fillets as you suggested but I do not know how to use a periodic flow and what are the assumptions that come with it...

[Rob]

It's covered in the Fluent User's Guide (boundary conditions and modelling heat transfer sections) and in the equivalent for CFX. 

[Isita]

Alright, thank you, I have a last question.... so I ran a scaled up version of the problem on a cluster but I think I am missing a line in the script file. Is "system" the right place to submit that question or can I keep adding to this discussion? Here is the link https://forum.ansys.com/forums/topic/error-running-fluent-on-a-cluster-improve-quality-used-in-setup/