I have a purely thermal analysis model with an inner and outer layer of Steel and in intermediate layer of G10 insulation. The inner surface has a low temperature applied to it, and the outer surface interfaces with a thermal sink condition of room temperature. Here is a screen capture:
There are these internal voids in the model which represent vacuum regions and I have been trying to implement radiation conditions from these surfaces but I have been running into error messages. I have the surfaces set to radiation and cavity, but I receive this error when checking/trying to run:
I looked on the forum and found this person getting the same error, and it was recommended to try the “tied contact” and to increase the tolerance. Where is this tolerance setting found in PrePoMax 2.5.0? Sorry if this is obvious, I am new to the program.
My suspicion is that the errors are either being caused by improper model set up (ie mismatching meshes) or perhaps that radiative surfaces shouldn’t be set up with an overlapping area with another part?
I thought the error could be coming from the large contact area between some of the inner radiative surfaces and the adjacent components so I tried the surface tying approach from this thread/linked tutorial
I would appreciate any feedback someone may have on the issues:
How would be best to implement these radiative surfaces within the cavities,
How to correctly create ties between the different component in this set up
I can attach the file of that would help diagnose.
I do have one further, non-specifically related question: How would be best to report the temperature throughout either a line or a plane intersecting the model (see below for illustrative example). I have read on another post from a few years ago that this is not natively supported in PrePoMax, is this still the case or has it since been implemented?
Those are just warnings. They indicate that some regions were not connected by tie constraints, but it’s not always wrong if the tie constraint spans areas that aren’t supposed to be connected.
What ERROR messages did you get (at the bottom of the job monitor) ? Those will be the actual reasons why the analysis stopped. The warnings you showed aren’t even related to cavity radiation definitions.
Tie constraints are usually better than tied contact. Only in some rare cases (when contact pressure is needed, when it’s easier to just change the contact type and when tie constraint fails for shell edges) there’s a need to use tied contact. Otherwise, I would avoid it. Tie constraints are much more robust.
They are just pretty much harmless warnings related to the default settings in your model.
It’s still not supported in PrePoMax. But you could convert the results to ParaView format and use the Plot Over Line filter there as shown in this tutorial: https://www.youtube.com/watch?v=wRcTD1zSbLU
Error messages: Ah I see, sorry for the misunderstanding. In the bottom window I do not actually seem to receive nay explicit error messages, instead just receiving a “Job failed - no result exist.” I assume this means I have something improperly defined or set up in the model, making a simulation impossible?
I seem to always be able to run a complete simulation when I deactivate the radiation loads. I tried to follow tutorial 25 as closely as I could for this, setting the sink temperature to -10 K to indicate to calcilux that it is meant to be an eclosed cavity.
This is a generic error message from CalculiX, usually indicating a wrong setup or a too large model (I always use Pardiso to avoid most such issues). Make sure there are no other relevant errors or warnings above. To identify this issue, you may have to suppress features one by one until it runs. I would start with cavity radiation.
