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Question about coordinates conversion in COMSOL

Posted 25 juil. 2012, 15:08 UTC−4 Parameters, Variables, & Functions Version 4.2 0 Replies

Xu Gong
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Hello, guys:
I have a question about COMSOL coordinates.

I build a model in Cartesian coordinates, but I want to convert to Cylinder coordinates by using
r=sqrt(x^2+y^2), z=y.

Noted that I don't use cylinder coordinate directly, but want to convert it from Cartesian coordinates.

First, I use the weak form to model very simple heat equation:

weak term: (-test(d(T,r))*k*d(T,r)-test(d(T,z))*k*d(T,z))*2*pi*r

Second, I use axisymmetric to reproduce the result using weak form:

weak term: (-test(Tr)*k*Tr-test(Tz)*k*Tz)*2*pi*r


But I cannot get the correct result, really don't know why.
Really appreciate the help. Thanks.

Xu
0 Replies Last Post 25 juil. 2012, 15:08 UTC−4
COMSOL Moderator

Hello Xu Gong

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