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Calculating Voltage, Using Boundary Integration, and Curl
Posted Jul 8, 2009, 8:01 p.m. EDT 1 Reply
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Hi folks,
I'm trying to calculate the voltage difference between two sides of a cube in my model.
I've seen elsewhere (www.comsol.com/support/knowledgebase/909/) to use a line integral via the boundary integration tool. However, I'm confused on how to use this, because a boundary integral in comsol is two dimensional (dA), whereas a line integral is one dimensional (.dl).
My other option is to compute the surface integral of the curl of E via a boundary integral. However, I don't know how to compute the curl in comsol, since 'curl' isn't a defined function. Also, I could manually write out the curl, but I have no idea how to put it in vector form for comsol. I thought it'd be something like,
[Ezy - Eyz, Exz - Ezx, Eyx - Exy], or
(Ezy - Eyz)*e_x + ...,
but comsol gives me an error.
Any ideas?
I'm trying to calculate the voltage difference between two sides of a cube in my model.
I've seen elsewhere (www.comsol.com/support/knowledgebase/909/) to use a line integral via the boundary integration tool. However, I'm confused on how to use this, because a boundary integral in comsol is two dimensional (dA), whereas a line integral is one dimensional (.dl).
My other option is to compute the surface integral of the curl of E via a boundary integral. However, I don't know how to compute the curl in comsol, since 'curl' isn't a defined function. Also, I could manually write out the curl, but I have no idea how to put it in vector form for comsol. I thought it'd be something like,
[Ezy - Eyz, Exz - Ezx, Eyx - Exy], or
(Ezy - Eyz)*e_x + ...,
but comsol gives me an error.
Any ideas?
1 Reply Last Post Jul 27, 2009, 5:05 a.m. EDT
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Posted:
2 decades ago
Use the boundary integration tool and divide the result by the width of the boundary. There is some info in the RF user guide on how Comsol calculates port voltages (p 122) . You can use that as a reference for your calculations.
greetz,
Maarten.
greetz,
Maarten.