Pro/MECHANICA Thermal Unconstrained DOF
Pro/MECHANICA Thermal Unconstrained DOF
(OP)
I'm trying to use the thermal portion of Pro/Mechanica for the first time. As a first model to get me going I have mocked up a simple cube with a surface heat load on one side, a fixed temperature on the opposite side, and convection on the other four walls. I keep getting the following error:
"The design study terminated abnormally.
The model is insufficiently constrained for the analysis.
Please review the element connections, properties, and
constraints.
You may be able to locate your model's problem area by
using Mechanica database ID numbers. ID numbers can be
queried using the "Entity ID" macro in Pro/MECHANICA
Standalone. The following ID numbers are associated
with this error:
3292
The unconstrained degree of freedom can be seen by running
a constrained Modal Analysis with rigid mode search.
Animating the rigid modes will display the unconstrained
degrees of freedom. If the error still occurs, then the
issue could be caused by material properties or unattached
spring/mass idealizations."
I do not have any structural boundary conditions in my model – is that my problem? If so, why would you need such constraints for a thermal only analysis (I am not doing coupled thermal/structural)? I am baffled with this – any help is much appreciated.
"The design study terminated abnormally.
The model is insufficiently constrained for the analysis.
Please review the element connections, properties, and
constraints.
You may be able to locate your model's problem area by
using Mechanica database ID numbers. ID numbers can be
queried using the "Entity ID" macro in Pro/MECHANICA
Standalone. The following ID numbers are associated
with this error:
3292
The unconstrained degree of freedom can be seen by running
a constrained Modal Analysis with rigid mode search.
Animating the rigid modes will display the unconstrained
degrees of freedom. If the error still occurs, then the
issue could be caused by material properties or unattached
spring/mass idealizations."
I do not have any structural boundary conditions in my model – is that my problem? If so, why would you need such constraints for a thermal only analysis (I am not doing coupled thermal/structural)? I am baffled with this – any help is much appreciated.
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RE: Pro/MECHANICA Thermal Unconstrained DOF
I also tried using the Entity ID macro in the Pro/MECHANICA standalone as stated above and the query for the noted ID above simple returns: "The entity with ID 3292 is a Pro Address".
This is very strange ... please help.
RE: Pro/MECHANICA Thermal Unconstrained DOF
I just tried an example with your stated thermal loads and BC's, and as expected it worked just fine.
RE: Pro/MECHANICA Thermal Unconstrained DOF
I do not understand what I am doing wrong. I even tried a cube with one surface featuring a fixed temp, the opposite side at a different fixed temp, and all other sides unconstrained (adiabatic). I still got similar "insufficiently constrained" errors.
I am thinking that I am missing something basic here, as I get the error regardless of what I try to do. Each run I set boundary conditions, select a material, and assign the material to the part. I am not manually meshing the model; instead I am allowing AutoGEM to automatically create my elements during the analysis run. This is driving me crazy.
RE: Pro/MECHANICA Thermal Unconstrained DOF
RE: Pro/MECHANICA Thermal Unconstrained DOF
Just a thought.
Stephen Seymour, PE
Seymour Engineering & Consulting Group
www.seymourecg.com
RE: Pro/MECHANICA Thermal Unconstrained DOF
Thanks a bunch for your help brep and seymours2571!!!