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Parametrized curve in COMSOL 4
Posted Jun 12, 2011, 6:09 p.m. EDT 2 Replies
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Hi everybody !
Hi have a 2D ring and i would like to plot the pressure in the interior boundary.
In comsol 3.5 i could do it very easily but with the new version I don't manage to do it anymore.
I tried to use a parametrized curve like this :
x = ri*cos(theta)
y= ri*cos(theta)
with theta a function of x and y.
But all i have is an error.
I also tried to use "phi" from cylindrical coordinates but i don't manage to use this variable.
How could i resolve this problem ?
Thanks :)
Vince.
2 Replies Last Post Feb 9, 2012, 10:07 p.m. EST
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Posted:
1 decade ago
I'm not superexpert, but I just did something similar in a 3D model and it worked.
What you have to do first of all is to define a cylindrical coordinate system by right clicking on the definitions subnode of the model node (see details in the documentation). If you don't change it, the new coordinate system will have a name like sys2 (or similar). The coordinates will be r, phi, a.
Now, you can refer to the new angular coordinate using sys2.phi, and defining your parametric curve should be straightforward.
BTW, I believe that in your particular case you don't really need a parametrized curve. You can define a data set valid on the boundary by right clicking the data set node and selecting "2d edge"...
Hope it helps
Giacomo
What you have to do first of all is to define a cylindrical coordinate system by right clicking on the definitions subnode of the model node (see details in the documentation). If you don't change it, the new coordinate system will have a name like sys2 (or similar). The coordinates will be r, phi, a.
Now, you can refer to the new angular coordinate using sys2.phi, and defining your parametric curve should be straightforward.
BTW, I believe that in your particular case you don't really need a parametrized curve. You can define a data set valid on the boundary by right clicking the data set node and selecting "2d edge"...
Hope it helps
Giacomo
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Posted:
1 decade ago
I want to get the models in details in documentation about parametric curves
thank you!
thank you!