Learning Forum

[John Miller]

Hello together,

I’m having a general question regarding restart analysis in Ansys transient thermal analysis.
My model is generating a new volume (AM process) in every substep via ealive.
Then I intend to step into /prep7 and create surf152 elements for radiation calculation, afer this I would like to re-enter the /solu stage. 

The script looks like this:

*do,….
ealive,…
D,…
sf,…
...
allsel,all
outres,all,all

time,...

solve

/prep7
…
esurf
…
Radiation
…
alls
toffst,273

/solu
nropt,full

??? antype,,rest ???

My question is:
Do I need “antype,,rest” for re-entering /solu after visiting /prep7  (starting wit /solu, then /prep7 and back to /solu)? The problem is that .rnnn and .rdb files are only provided in structural analysis not thermal.
The .rnnn file can be create with: “rescontrol,define,load step nr.,substep nr” but .rdb file ? 

Best regards 
John

 

[Chandra Sekaran]

1) Yes, you need a restart. Anytime during solution , if you leave the /SOLU module and come back in you need a restart. In a transient thermal analysis at the first SOLVE command the rdb, ldhi files are created. Then the .rxxx files are created during solution. All of these files are required for restart.

2) You cannot add new elements to the model in a static/transient restart. So adding new surf152s will be a problem