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mathematical expression
Posted Sep 5, 2012, 10:46 a.m. EDT Materials, Parameters, Variables, & Functions Version 4.2a 1 Reply
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Hi people
in the expressions in general I have terms to which I can assign a value or even an expression.
In the maths module I have a source term "f"
I can assign to f any value I want
but how can I assign to f the derivative of u?
I mean, to have f=du/dx what should I write in there?
should I write ux? dux? u'x ?
in the expressions in general I have terms to which I can assign a value or even an expression.
In the maths module I have a source term "f"
I can assign to f any value I want
but how can I assign to f the derivative of u?
I mean, to have f=du/dx what should I write in there?
should I write ux? dux? u'x ?
1 Reply Last Post Sep 5, 2012, 4:07 p.m. EDT
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Posted:
1 decade ago
Hi
if u is a deendent variable of your PDE then COMSOL notation makes ux the first derivative of u along x, uxx the second derivative etc ... See the doc it's all in there use the search
--
Good luck
Ivar
if u is a deendent variable of your PDE then COMSOL notation makes ux the first derivative of u along x, uxx the second derivative etc ... See the doc it's all in there use the search
--
Good luck
Ivar