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Map Surface to Full Domain via model couplings or extrusion

Posted 8 set 2011, 11:22 GMT-4 Parameters, Variables, & Functions Version 4.1, Version 4.2 2 Replies

Rachel Headley
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Using COMSOL 4.1, I'm interested in mapping a surface defined by one of my boundaries to all other boundaries. I've been trying to figure out how to do this using the extrusions and global parameters, but actually having it work is alluding me. I want to be able to map the surface cartesian z coordinate right now, but I will eventually want to be able to do this is a more general sense. I know that I was able to do something similar in 3.5 but that was only a 2D (a surface defined in x), but I can't seem to replicate what I did.

I have my surface boundary (zs) defined as some function of x and y: zs = f(x,y)
I'd like to map it so that at any given x,y coordinate, I have zs defined.

I've attached a little conceptual PDF of what I hope to do. I'm modeling glacier (non-Newtonian) flow in a somewhat simplified manner, and some of the simplified stresses depend only on the surface elevation of the ice, which is what I need to map at all x and y.

Attachments:

2 Replies Last Post 6 ott 2011, 17:00 GMT-4
Rachel Headley
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Posted: 1 decade ago 14 set 2011, 11:40 GMT-4
I solved this for myself, if anyone else is interested. It's actually pretty trivial once I figured it out.

I'm using a 3D model, so I created a General Extrusion (genext) with Source Selection:
Geometric entity level: Boundary
Selection: Top Boundary (or arbitrary boundary)

Destination Map
x-expression: x
y-expression: y
z-expression: (this is left blank)

Source Map
x-expression: x
y-expression: y
z-expression: (this is also left blank)


I solved this for myself, if anyone else is interested. It's actually pretty trivial once I figured it out. I'm using a 3D model, so I created a General Extrusion (genext) with Source Selection: Geometric entity level: Boundary Selection: Top Boundary (or arbitrary boundary) Destination Map x-expression: x y-expression: y z-expression: (this is left blank) Source Map x-expression: x y-expression: y z-expression: (this is also left blank)
Mustafa Alam
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Posted: 1 decade ago 6 ott 2011, 17:00 GMT-4

I solved this for myself, if anyone else is interested. It's actually pretty trivial once I figured it out.

I'm using a 3D model, so I created a General Extrusion (genext) with Source Selection:
Geometric entity level: Boundary
Selection: Top Boundary (or arbitrary boundary)

Destination Map
x-expression: x
y-expression: y
z-expression: (this is left blank)

Source Map
x-expression: x
y-expression: y
z-expression: (this is also left blank)


Hi
I am trying to find capacitance from vibrating parallel plate capacitor. My structure is two parallel plate capacitor. But for my capacitance calculation I wanted the the gap(x, y) will be changing as because both plate is vibrating. I know how to make integration for one plate but i don't know how to make integration for this type of variable epsilon/(D1-D2). Where D1 is displacement w for upper plate and D2 displacement for lower plate.People told me that I will have to use mapping function(extrusion or projection operator) to find the point by point distance between two plates,but I don't know how to use that. Can you please help me on that?
Thanks
[QUOTE] I solved this for myself, if anyone else is interested. It's actually pretty trivial once I figured it out. I'm using a 3D model, so I created a General Extrusion (genext) with Source Selection: Geometric entity level: Boundary Selection: Top Boundary (or arbitrary boundary) Destination Map x-expression: x y-expression: y z-expression: (this is left blank) Source Map x-expression: x y-expression: y z-expression: (this is also left blank) [/QUOTE] Hi I am trying to find capacitance from vibrating parallel plate capacitor. My structure is two parallel plate capacitor. But for my capacitance calculation I wanted the the gap(x, y) will be changing as because both plate is vibrating. I know how to make integration for one plate but i don't know how to make integration for this type of variable epsilon/(D1-D2). Where D1 is displacement w for upper plate and D2 displacement for lower plate.People told me that I will have to use mapping function(extrusion or projection operator) to find the point by point distance between two plates,but I don't know how to use that. Can you please help me on that? Thanks

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