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header in txt file imported to COMSOL
Posted Mar 12, 2011, 10:14 p.m. EST Version 4.1 1 Reply
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hi,
I've got a 2D geometry and want to describe it with a parameter changing only in Y direction (vertically). I have a txt file which I imported creating an interpolation function, but how can I 'tell' COMSOL that this property is changing in only one dimension and which one is it? I guess the answer is in appropriate use of header (which would also help me defining usits for this property), but I cannot find a clear enough and working example of it.
is it % y[m] C[mol/m^3]? it does not work though. (the file is sectionwise)
thank you in advance
Mike
I've got a 2D geometry and want to describe it with a parameter changing only in Y direction (vertically). I have a txt file which I imported creating an interpolation function, but how can I 'tell' COMSOL that this property is changing in only one dimension and which one is it? I guess the answer is in appropriate use of header (which would also help me defining usits for this property), but I cannot find a clear enough and working example of it.
is it % y[m] C[mol/m^3]? it does not work though. (the file is sectionwise)
thank you in advance
Mike
1 Reply Last Post Mar 13, 2011, 6:16 a.m. EDT
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Posted:
1 decade ago
Hi
if I catch your right, you have a rectangle in 2D (x,y) and you want to impose, a value that changes along "Y".
If so, then for simplicity let us consider a voltage of "V1" on the top edge, and V0 on the bottom edge, the voltage change between the two electrodes is then simply
V = (V1-V0)*(y-Y0)/Distance
where Y0 is the "Y" value of the lower electrode and Distance is the distance between the two electrodes
Try it out with an initial condition and just solve for initial conditions (i.e. v4 select solver dependent variables right click solve to here)
If you have a home brewed V field, then make an interpolation function and call it instead of the formula above
--
Good luck
Ivar
if I catch your right, you have a rectangle in 2D (x,y) and you want to impose, a value that changes along "Y".
If so, then for simplicity let us consider a voltage of "V1" on the top edge, and V0 on the bottom edge, the voltage change between the two electrodes is then simply
V = (V1-V0)*(y-Y0)/Distance
where Y0 is the "Y" value of the lower electrode and Distance is the distance between the two electrodes
Try it out with an initial condition and just solve for initial conditions (i.e. v4 select solver dependent variables right click solve to here)
If you have a home brewed V field, then make an interpolation function and call it instead of the formula above
--
Good luck
Ivar