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evaluate a transient variable

Posted Jul 27, 2010, 1:29 a.m. EDT 1 Reply

Chunguang Xia
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Hi, I am working on a transient problem. I defined a variable using the global equation. How can I evaluate or obtain the value of this variable at previous time? say, the variable is 'F', I would like to get the value or expression of F at time (t-10) in the model.

thanks
Chunguang Xia
1 Reply Last Post Jul 27, 2010, 3:31 a.m. EDT
Sven Friedel COMSOL Employee

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Posted: 1 decade ago Jul 27, 2010, 3:31 a.m. EDT
Hi Chunguang,

you can access variables in postprocessing using the "at" operator for instance at(10,u) would produce the variable u at time 10. However, it is not possible to use such expressions in equations on runtime creating a feedback.

Sven
Hi Chunguang, you can access variables in postprocessing using the "at" operator for instance at(10,u) would produce the variable u at time 10. However, it is not possible to use such expressions in equations on runtime creating a feedback. Sven

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