topic Re: Transient Natural Convection with Joule Heating not solving with Scalable so in CFD Forum

Transient Natural Convection with Joule Heating not solving with Scalable solver

Anonymous — Thu, 07 Apr 2016 18:48:08 GMT

Hello,

I have a completed project in CFD 2016 where I ran a transient natural convection analysis with joule heating (Voltage and current specified, and the material has a temperature dependent resistivity). I decided to test out the scalable solver in CFD 2017 so I converted the CFD file after opening in CFD 2017, and selected Solve, changed the Computer to Scalable Solver, and hit Solve.

I get an error saying "Only a single current or voltage boundary condition was found". Yet I go back to the model setup and it clearly shows I have a current and voltage Boundary condition on two separate faces of the model.

Can someone help? Why does the Scalable solver have a problem with the model?

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Jon.Wilde — Fri, 08 Apr 2016 13:03:41 GMT

Hi,

Did you see the messages in the output bar at the bottom? Are they correct?

Does it run OK in 2017 with the standard solver?

Thanks,

Jon

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Anonymous — Fri, 08 Apr 2016 23:22:29 GMT

Hi Jon,

Thanks for responding.

Did you see the messages in the output bar at the bottom? Are they correct? Yes I saw them and they are incorrect. There is only 1 material with Joule Heating applied, and its the standard value for High Resistivity Stainless Steel

Does it run OK in 2017 with the standard solver? Yes, I just ran 2 time steps with 3 inner iterations (the full 400 iteration simulation takes a while) successfully. The standard solver did not complain about the resistivity.

I switched it back to the Scalable solver, and when the job starts I see the following message in the message bar ((see attached screenshot), but I never made any changes to the setup, I am unsure as to why its generating a new mesh with tets or triangle elements in the boundary layer. When it was done meshing, the Scalable solver threw up the Resistivity error after 0 time steps

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Jon.Wilde — Mon, 11 Apr 2016 06:55:46 GMT

The method with the alternative solver has to use only tet elements, so you are seeing a re-mesh and the first message. I am not sure why it will not run though, all I can suggest is that you share the model with me (CFZ file) and we can take a look.

It is possible that this analysis type simply is not supported with the new solver yet, I cannot see it listed on the can or cannot list here yet and so I need to check.

Thanks,

Jon

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Anonymous — Mon, 11 Apr 2016 16:13:53 GMT

Okay. Is there any performance difference to e aware of with the Scalable solver switching to tet elements that we should be aware of? (i.e. how does it impact the results?)

Is there an FTP site I can send the share file to? It contains customer models so I cannot share it on a pulic forum.

Thanks.

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Jon.Wilde — Wed, 13 Apr 2016 19:05:42 GMT

As far as I am aware, the results should still be OK 🙂

Do you have a subscription with us at all? If you do, we can move to a 1:1 case and work out of the public domain. Otherwise, we would need to continue to work here really.

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Anonymous — Thu, 14 Apr 2016 13:27:29 GMT

Yes I do have a subscription with Autodesk. Do I just create a case?

Re: Transient Natural Convection with Joule Heating not solving with Scalable so

Jon.Wilde — Fri, 15 Apr 2016 07:31:14 GMT

Hi,

I see that you did already, thank you.

(We can also escalate from here but I will leave the thread as is for now, Todd owns your case and will assist 🙂 ).

Thanks!

Jon