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difference between d(P,x) and PTx
Posted 11 giu 2013, 09:12 GMT-4 Fluid & Heat, Parameters, Variables, & Functions Version 4.3a 1 Reply
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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 11 giu 2013, 11:08 GMT-4
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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