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Weak Contribution For Boundary

Posted May 22, 2015, 4:15 p.m. EDT 0 Replies

Brandon Jackson
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In the deforming square droplet case posed on the exchange (www.comsol.com/community/exchange/121/), the weak contribution is:

-nu_surf*(test(uTr) + test(u)/r + test(wTz))

I recognize that this is a result of the young laplace equation. I worked through part of the derivation (attached if you care to see). However, I am a little uncertain as to how the variables uTr and wTz appear. I recognize that Tr and Tz represent the tangential derivatives of the variables u and w respectively. But what are u and w? In the laminar flow module, it says that they are the velocity field components. But how do they mathematically appear?

Thanks in advance for any help. It will be much appreciated.

Regards,

Brandon Jackson
0 Replies Last Post May 22, 2015, 4:15 p.m. EDT
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