Coupled Analysis
Coupled Analysis
(OP)
Hi,
I am trying to do a thermo-mechanical coupled analysis, in the mechanical part I wish to do a modal analysis.
I have defined the thermal and mechanical parameters and compatible element. First I apply thermal boundary condition and solve for temperature distribution and the write the PHYSICS environment. Then I use the following to enter the modal analysis type
/solu !Re-enter the solution phase
ANTYPE,MODAL ! Choose modal analysis type
then I read the struct environment
physics,read,struct ! Read in the struct environment
after this I read the thermal load by
ldread,temp,,,,,,rth ! Apply loads derived from thermal environment
I am not able to see any apperent change in modal values even if I am changing the temperature boundary condition by great amount. It seems I have not coupled it properly, can someone throw some light on this
Thanks and Regards
I am trying to do a thermo-mechanical coupled analysis, in the mechanical part I wish to do a modal analysis.
I have defined the thermal and mechanical parameters and compatible element. First I apply thermal boundary condition and solve for temperature distribution and the write the PHYSICS environment. Then I use the following to enter the modal analysis type
/solu !Re-enter the solution phase
ANTYPE,MODAL ! Choose modal analysis type
then I read the struct environment
physics,read,struct ! Read in the struct environment
after this I read the thermal load by
ldread,temp,,,,,,rth ! Apply loads derived from thermal environment
I am not able to see any apperent change in modal values even if I am changing the temperature boundary condition by great amount. It seems I have not coupled it properly, can someone throw some light on this
Thanks and Regards





RE: Coupled Analysis
After doing the thermal analysis I proceeded to static anlysis with Pressure effects turned on and thermal load read using LDREAD... once the static solution was done I re-entered the solution mode and executed the modal analysis.
In short after thermal distribution I tried to convert it to a PRE-STRESS problem.
RE: Coupled Analysis
yes, your last post seems to contain the right way to proceed: you won't see anything in the modal analysis unless the "Prestress Effects" are not turned on, and in order to do so, the modal analysis must be preceded by a structural one with "Calculate Prestress Effects" turned on as well.
Regards