Centroid of named selection (face) with APDL

- June 21, 2022 at 11:18 am
  ofo
  Subscriber
  Hi,
  How do I get the centroid of a named selection in APDL? It needs to be done in post processing, as is needs to be found for the deformed shape (at least when large deflection is turned on). I tried to use ASUM/GSUM, but they don't seem to be appliable in POST. Is it possible to find the centroid of an arbitrary area with APDL?
  My very simple code:
```
cmsel,s,NamedSelection
asum
*get,CentroidX,area,0,cent,x
*get,CentroidY,area,0,cent,y
*get,CentroidZ,area,0,cent,z
```
  Unfortunately it doesn't work, as post.out states that: "ASUM is not a recognized POST1 command, abbreviation, or macro..."
  Thanks in advance. Your help is much appreciated.
- June 28, 2022 at 3:39 pm
  
  wrbulat
  Ansys Employee
  
  ASUM returns the inertial properties of an area (a "surface body" created with MAPDL). There are no MAPDL "solid model" entities in models created by Mechanical, so if your model was created in Mechanical I would not expect ASUM to work.
  
  This is old code but I think it might still work.
  finish
  save
  /file,scrap
  /solu
  
  cmsel,s,named_selection
  esln,s,1
  
  irlf,-1
  psolve,elform
  psolve,elprep
  irlist
  *get,mtot,elem,,mtot,x
  
  *get,mcx,elem,,mc,x
  *get,mcy,elem,,mc,y
  *get,mcz,elem,,mc,z
  
  *get,imcx,elem,,imc,x
  *get,imcy,elem,,imc,y
  *get,imcz,elem,,imc,z
  
  *get,ipx,elem,,iprin,x
  *get,ipy,elem,,iprin,y
  *get,ipz,elem,,iprin,z
  
  *get,ang_xy,elem,,iang,xy
  *get,ang_yz,elem,,iang,yz
  *get,ang_zx,elem,,iang,zx
  
  finish
  /file,file
  resume
  /solu
  
  The parameters returned by the *GET command in the code above are described in the MAPDL Help:
  I hope this helps!
  Bill