×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Force calculations using Maxwell stress tensor in electrostatic field

Force calculations using Maxwell stress tensor in electrostatic field

Force calculations using Maxwell stress tensor in electrostatic field

(OP)
Hello;

I am just beginning using ANSYS. I need to calculate force that acts on the surface of a sphere in an electrostatic field. My model is axis-symmetric. I have created an axis-symmetric 2D model and the computer calculated the electric field and the charges, etc on the surface of the sphere. I need to calculate the force on the surface of the sphere using Maxwell stress tensor. To do this I've done the following:

CODE

!code from pre-processor
rsys,0
csys,11,0,0,0
nsel,loc,x,0.95*r,1.05*r
esln
cm,cname, !As I understand, now, I have to write some components of the elements, which?
fmagbc,'cname'  
Solution works.
post-processor:
fmagsum,'cname' - here it says that the componenets of the elemetns are not selected thus fmagsum is equal 0.

Sincerely,

John

RE: Force calculations using Maxwell stress tensor in electrostatic field

Hello,

Looking at your code, I see you have already selected nodes and elements on nodes. I suppose you want to compute the magnetic force acting on those elements. For this you have to define an elements component:

cm,cname,elem

It is important that those elements are surrounded by air elements, see the help on fmagbc.

After solution, make sure that all elements are selected and then use fmagsum.

Regards
Alex

RE: Force calculations using Maxwell stress tensor in electrostatic field

(OP)
Thank you very much.

John

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources