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Accessing du/dx in general PDE form in comsol 3.5a

Posted Oct 12, 2010, 1:01 a.m. EDT 0 Replies

Rakesh Dhote
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Hi,

I am using the time dependent general PDE form in comsol 3.5a.
Consider a general form with dependent variable "u" in 2D.

I would like to increment the first derivative of u wrt x space direction i.e. du/dx in a ramp loading with time over the whole subdomain

du/dx (t_1) = du/dx(t_0) + constant * t (over subdomain)

where t_1 is next time increment and t_0 is previous time increment.

I found that I do not have access to the du/dx term in the Physics>Equation System> Subdomain Settings.

How to access the du/dx term in the subdomain to increment it in ramp loading with time? Please let me know, how to access this term?

Thanks in advance,
Rakesh
0 Replies Last Post Oct 12, 2010, 1:01 a.m. EDT
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Hello Rakesh Dhote

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