Hi There.
I'm trying to perform a transciente analysis in a system with concentric cylinders and with a heat power at the center of the system. But the software could never finish the analysis; always appears an issue, like the error mensage: Status code 9999 PCGLS_FATAL. Or something like: the Diagonal coefficient matrix is zero.And further something like: the results not converged after 1000 iterations.
Beyond that the analysis take too long time. The program takes sometimes 24 hours to calculate the view factor and after he spends hours to make one iteraction. It happens that at the interactions the solidworks fails to converge the results; most of the time he could not even pass the first iteration.
This is analysis are par of a research project; it is very important realize them in the next weeks. If anyone can help, I would greatly appreciate it.
Above is the link of a zip archive of all the parts of the model. There are several simulations in the model, from the more simplified model to the more complete.At the zip archive are atached also the curve of ambient temperature and heat power, beyond of specific heat of Aluminium.
https://www.dropbox.com/s/54ly8zcsovkm9eh/C%C3%B3pia_ensaio%20t%C3%A9rmico-zip.zip
From already thank you
PS: I'm Brazilin, so sorry for my english.
just guessing, i took a look at modelo final, 1clindro
a few things i noticed that don't make sense to me:
1. the surface heat generation is applied to the faces of the component in the middle. i'd recommend applying it to the body since you chose total anyways.
2. no initial temperature applied to the cylinder in the middle, only the shell
3. you have open system selected for the inside face and also surface to ambient
4. to get started, i'd recommend the coarsest mesh possible and also draft qualify meshing. (i haven't really dug in but fir some reason the mesh is getting refined in areas i'm not expecting, i may also recommend building a model specifically for analysis for testing your setup. ran into some other issues with the model wtih excluded components like simulation thinking material wasn't applied..etc which also points me to suggesting a new model)
5. global and component cotact set to insulated? really shouldn't do anything because they aren't touching but wanted to note it as strange.i couldn't edit the component contact.
6. you have the very small faces of the cylinder selected as part of the radiation. that part is probably not significant but every element is involved in the radiation.at minimum, make it part of the surface to ambient vs the surface to surface. that way it doesn't have to do view factor calculations to all the other faces.
7. usually symmetry isn't possible with radiation but i'd think about if there is a way to do a slice of this vs the whole model. maybe insulated faces or something similar at the cut planes. i think we came up with a solution a few years ago at hawk ridge, but its not really coming to me right now.
8. no surface to surface radiation between the shell and the cylinder
made most of the fixes described here and running a steady state