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Basic Question - How to use Maximum Model Coupling Variable?
Posted Jul 18, 2011, 4:14 p.m. EDT 0 Replies
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I have a question regarding the very basic use of the maximum model coupling variable.
In my results, I have the voltage profile along the wire I've created in my geometry. It basically starts at a maximum value and decreases linearly to 0 V along the wire. I need to use the terminal voltage value of the wire in another equation, but the actual Electric Current module value of the terminal voltage (ec.V0_1 or something like that) doesn't seem to be working correctly (0V at all times). The voltage profile looks correct though, so I need to use the maximum value on this as the terminal voltage. Unfortunately, because the Electric Potential V the module solves for is a function of x, I can't simply plug in "V" where I need it in my other equations. I need the maximum value of voltage along the domain, for each time step, in order to simulate correctly.
So I've created a maximum coupling variable, called maxop1, and selected the entire wire as my domain. Now what do I do? I've tried using it where I need, putting maxop1(V) where appropriate, but it gives errors of unknown function. Do I need to create a new function involving this maximum coupling variable? If so, what would be the step-by-step process to do this?
I'm sorry for my lack of knowledge of COMSOL basics, but any help at all would be greatly appreciated! Thanks in advance for your time!
Thomas
Hello Thomas Rembert
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