Learning Forum

[IsaccoRafanelli]

Hi everybody,

i'm launching a Steady State Thermal analysis with an Ansys Mechanical APDL macro code from Matlab in order to automatize a decoupled CHT caculus, but i'm facing with some issues. The matlab string used to launch the simulation is the following:

"!"C:Program FilesANSYS directoryANSYS192.exe" -b -i input.mac -o output.txt"

where the file "input.mac" has been created in ANSYS Mechanical with the command "write input file" and contains either all the informations about geometry, mesh, boundary conditions, and the command "solve" in /solu environment, or the manually written macro code for the results export (written in /post1 environment after the "solve" command).

The main issue is that commands written after "solve" are not considered, no matter what i write (i tried to write some random digits but it doesnt give any errors/warnings) included the macro code for the results export.T he output file doesn't show any errors and at the end "solution converged after XX iterations" is written.

For a further test i tried to load the macro code on Ansys Mechanical APDL with the graphical interface. After the loading, solution data are not available and a manually written "/solu solve" is needed.

I report the /solu and the /post1 environments of "input.mac" here:

/com,****************************************************************************

/com,*************************  SOLUTION    ********************************

/com,****************************************************************************

/solu

antype,0          ! static analysis

!eqsl,sparse        ! using sparse solver which is default so no eqsl command needed

cntr,print,1        ! print out contact info and also make no initial contact an error

rescontrol,,none         ! Do not keep any restart files

dmpoption,emat,no       ! Don't combine emat file for DANSYS

dmpoption,esav,no       ! Don't combine esav file for DANSYS

/com,****************************************************

/com,******************* SOLVE FOR LS 1 OF 1 ****************

esel,s,type,,18

nsle

sf,all,hflux,5000

!OTHER BOUNDARY CONDITIONS ARE NOT REPORTED

nsel,all

esel,all

autots,on

nsub,1,10,1

time,1.

outres,erase

outres,all,none

outres,nsol,all

outres,rsol,all

outres,eangl,all

outres,etmp,all

outres,veng,all

outres,fflux,all

outres,cont,all

/nopr

esel,s,type,,22

esel,a,type,,23,49

cm,_elmisc,elem

esel,all

/gopr

outres,misc,all,_elmisc

cnvtol,heat,,.001,,1.e-006  ! Program Controlled. Set MINREF equivalent of 1e-6 Watts

! *********** WB SOLVE COMMAND ***********

! check interactive state

*get,ANSINTER_,active,,int

*if,ANSINTER_,ne,0,then

/eof

*endif

solve

!PROBLEM: COMMANDS WRITTEN BELOW ARE SKIPPED

/com *************** Write FE CONNECTORS ********* 

CEWRITE,file,ce,,INTE

/com,****************************************************

/com,*************** FINISHED SOLVE FOR LS 1 *************

*get,_wallasol,active,,time,wall

/post1

/INPUT,'postpr','dat','C:Users afanelliDocumentsITER1A',, 0  !MACRO FOR POSTPROCESS

xmlo,ENCODING,ISO-8859-1

xmlo,parm

/xml,parm,xml

fini

/gopr

*get,_walldone,active,,time,wall

_preptime=(_wallbsol-_wallstrt)*3600

_solvtime=(_wallasol-_wallbsol)*3600

_posttime=(_walldone-_wallasol)*3600

_totaltim=(_walldone-_wallstrt)*3600

*get,_dlbratio,active,0,solu,dlbr

/com,--- Number of total nodes = %_numnode%

/com,--- Number of total elements = %_numelem%

/com,--- Element load balance ratio = %_dlbratio%

/wb,file,end        ! done with WB generated input

I think there is a problem with the solution command but i'm not able to figure out.

Thank you so much

[giuliogenerini]

Hi everyone! I've the same problem: does anyone have the solution?
Thanks in advance!

[Ashish Khemka]

Please see if the following link helps:

Run Ansys from Matlab | ths1104 geek├® (wordpress.com)

Regards Ashish Khemka

[Chandra Sekaran]

You mention that the commands right after SOLVE are ignored. Does the output show that the SOLVE completed successfully? It almost sounds like the solve stopped without completion and nothing else is being executed. Do you have the postpr.dat in the location 'C:\Users\rafanelli\Documents\ITER1A\ ?