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 The information provided may be out of date.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.
difference between d(P,x) and PTx
Posted Jun 11, 2013, 9:12 a.m. EDT Fluid & Heat, Parameters, Variables, & Functions Version 4.3a 1 Reply
Please login with a confirmed email address before reporting spam
I use the thin film flow module (with reynolds equation) to create a journal bearing model.
My question is : what's the difference between d(P,x) and PTx ?
Because d(P,x) is the differentiation of P with respect to x
But what does it mean PTx ?
Thanks for your help.
My question is : what's the difference between d(P,x) and PTx ?
Because d(P,x) is the differentiation of P with respect to x
But what does it mean PTx ?
Thanks for your help.
1 Reply Last Post Jun 11, 2013, 11:08 a.m. EDT
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
Hi,
d(P,x) and Px represent the derivative of P in the x direction. PTx, for example, is a "tangential derivative", defined on boundaries, edges, and points. Tangential derivatives represent the Cartesian components of the tangential projection of the gradient of shape function variables.
Best regards,
Magnus Ringh, COMSOL
d(P,x) and Px represent the derivative of P in the x direction. PTx, for example, is a "tangential derivative", defined on boundaries, edges, and points. Tangential derivatives represent the Cartesian components of the tangential projection of the gradient of shape function variables.
Best regards,
Magnus Ringh, COMSOL