APDL integrate heat flux through surface

[benoitlaveau]

Hi everyone,

I have a very basic ANSYS steady state thermal model with different convection boundary conditions. I am using ANSYS Workbench 16.1.

I would like to calculate the heat flux through a surface defined via a named selection.

I've found this old thread:

http://www.eng-tips.com/viewthread.cfm?qid=316852

in that thread the answer is
*vget,QRes(1),node,1,tf,z
*stat,QRes

=> my script:
(I have outres,all,all in a command snippet in pre-processing part)
in post snippet
cmsel,s,top ! top is my named selection
*GET,NNOS ,NODE,0,COUNT ! NUMBER OF NODES
*DIM,dataP,ARRAY,NNOS,1,1, , , ! CREATE DE NODE NUMBER VECTOR
*VGET ,dataP(1,1),NODE, ,TF,Z,
I do get the error that the quantity is not available in the database

On other threads or forum I have read about filling a etable with again TF and then using SSUM. I get the same TF issue
but I do not really understand the following:
- does the ssum function really do an integration on the heat flux or a sum?
- TF Z is only along the Z axis: how do we get the heat flux normal to the surface (random normal)?
- am I missing something? how does the final script should look like?

Thanks everyone for your help,

Best regards

Benoit

 

[rickfischer51]

If you are already in Workbench, put a flux probe on the surface.

Rick Fischer
Principal Engineer
Argonne National Laboratory