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Dependent variable as a function of coordinates
Posted 18 avr. 2013, 19:11 UTC−4 1 Reply
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Hello
I've solved 2D PDE problem and I've got distribution field of the dependent variable (_u_).
Now I need global function that should use solution _u_ as a function of coordinates.
I can't understand how I can get scalar u(x,y) in global definitions.
I use "data export" of _u_ to the text file then import that file to the global interpolation function and get function of two coordinates. But I hope, there must be the easier way.
Thanks a lot.
I've solved 2D PDE problem and I've got distribution field of the dependent variable (_u_).
Now I need global function that should use solution _u_ as a function of coordinates.
I can't understand how I can get scalar u(x,y) in global definitions.
I use "data export" of _u_ to the text file then import that file to the global interpolation function and get function of two coordinates. But I hope, there must be the easier way.
Thanks a lot.
1 Reply Last Post 19 avr. 2013, 01:09 UTC−4
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Posted:
1 decade ago
Hi
you cannot get any _u_(x,y) field into a global definition, as the Global variables are at best depednent on "t"
You ca define variables in "Model - Definition (on specific entities) - variables ) then you get the link of the coordinates of your filed onto some or all entities
Check definition of FEM entities (domain, boundary, edges, points) and geometrical Objects (volume surfaces lines vertex/points) in the COMSOL doc or on theforum. (there is also the glossary on the main COMSOl site, quite usefull ;)
--
Good luck
Ivar
you cannot get any _u_(x,y) field into a global definition, as the Global variables are at best depednent on "t"
You ca define variables in "Model - Definition (on specific entities) - variables ) then you get the link of the coordinates of your filed onto some or all entities
Check definition of FEM entities (domain, boundary, edges, points) and geometrical Objects (volume surfaces lines vertex/points) in the COMSOL doc or on theforum. (there is also the glossary on the main COMSOl site, quite usefull ;)
--
Good luck
Ivar