Coupled Thermal-Structural, using LDREAD

[HVSmith]

Hi - have been trying to get a couple thermal-structural model working, using the LDREAD command. Everything seems to be going OK, except...

When I go to read and plot results I always get the error
"An error occured while attempting to open the results file FILE.rst"

(The .rth file is being updated everytime I run, I checked this).

I have read through the ANSYS coupled-field analysis guide section 2.5, various posts on this forum but nothing seems to be helping so far...

I am using physics environments, and the element type is correctly changing between analyses.

I'm doing a transient thermal anaylsis and then I want to input these temperatures into a structural analysis.

Excluding the structural solution phase everything works fine.

!first do the transient thermal analysis
/SOLU
ANTYPE,TRAN
PHYSICS,READ,THERMAL
OUTRES,ALL,ALL

ESEL,S,TYPE,,1
BFE,ALL,HGEN,,%INPUT%

KBC,1
TIME,5
DELTIM,20E-3,20E-4,20E-2
ALLSEL
SOLVE

FINISH


!secondly do the structural solution
/SOLU
ANTYPE,TRAN
PHYSICS,READ,STRUCT
OUTRES,ALL,ALL

ESEL,S,TYPE,,1

KBC,1
TIME,5
DELTIM,20E-3,20E-4,20E-2

LDREAD,TEMP,,,,,FILE,RTH

TREF,0

ALLSEL
SOLVE

FINISH

Is anyone able to give any ideas as to what may be going wrong?
Any comments much appreciated.

Thanks
HVSmith

 

[HVSmith]

Still having no joy with this and going around in circles now - does the lack of replies signify the problem really is that trivial?

I've read and re-read the coupled-field analysis guide and from what I understand the code in the above post should be working...it's just never making the structural results file.

I'm also getting an error, on occasion, to do with an unconstrained model:

*** ERROR *** CP = 255.844 TIME= 12:04:52
A small negative equation solver pivot term has been encountered at the
ROTX degree of freedom of node 322. Check for an insufficiently
constrained model.


I've never worked with load-transfer coupled-field analysis before but it is certainly proving problemous to me.

Thanks for any advice you are able to give!

HVSmith