Menu

Discussion Forum

New Discussion
查找

Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Plotting the gradient

Posted 2011年4月27日 GMT-4 12:49 Mesh, Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 4.1, Version 4.2 3 Replies

Daniel Wagner
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi everybody!
I'm still very new to Comsol so the answer of my question might be obvious for some of you but I just don't get it.

My question is:
How can I plot the gradient (of an electric potential) on a surface of a geometry. Later on, I'd like to get the gradient for all points of an contour plot. I actually only need the gradient for these points and not for all on the surface but I also would like to know how to do it for all points.

I know the variable ux, uy and uz etc give me the values the gradient at a specific point but I've no idea how I can use these variables inside a plot (or a result table?). I hope somebody can help me or give me a hint how to do something like this in general or will tell me where I can find the needed informations to find it out by myself.

Thank you very much!
Daniel
3 Replies Last Post 2011年6月27日 GMT-4 11:48
COMSOL Moderator

Hello Daniel Wagner

Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.

If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.

Shane Crippen
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年6月20日 GMT-4 14:22
I've been trying to do the same thing. Have you figured it out?
I've been trying to do the same thing. Have you figured it out?
Graham Ferrier
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年6月21日 GMT-4 20:39
The gradient of potential with respect to x and y are "Vx" and "Vy". COMSOL recognizes these variables as representing the spatial derivatives of the dependent variable, V. I think it works for any dependent variable. In heat transfer, for example, Tx and Ty, are spatial derivatives of temperature with respect to x and y.
The gradient of potential with respect to x and y are "Vx" and "Vy". COMSOL recognizes these variables as representing the spatial derivatives of the dependent variable, V. I think it works for any dependent variable. In heat transfer, for example, Tx and Ty, are spatial derivatives of temperature with respect to x and y.
Shane Crippen
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2011年6月27日 GMT-4 11:48
I'd like the gradient of the electric field. Comsol uses Ex, Ey, and Ez for the components of the E field. In that case, I don't think Ex would be the spatial derivative. The notation I've been using and seems to work is, d(Ex,x), if I want the gradient of the x component of the E field.
I'd like the gradient of the electric field. Comsol uses Ex, Ey, and Ez for the components of the E field. In that case, I don't think Ex would be the spatial derivative. The notation I've been using and seems to work is, d(Ex,x), if I want the gradient of the x component of the E field.

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content