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Parameterise the position in a text file?
Posted 7 feb 2013, 08:40 GMT-5 2 Replies
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Hello,
I want to use the 2D distribution of the relative permeability of a nonlinear calculation in a linear calculation of the same Model with same parameters etc.
For that I export the data of the relative Permeability, depending on my Parameter (Parametric Sweep) and the coordinates x and y (See attached file "Forum 2.png").
This text file is being imported into the linear model with an interpolation function and the source is set to "file" with 2 arguments!
It is possible to write every single "Position in File" per Hand, but since I want to use ca. 100 Parameter values, this would just take too long.
However, if I want to choose a parameter for the "Position in file" (same parameter as my Parametric Sweep parameter), COMSOL only allows positive integers (See attached File "Forum 1.png")
Do you guys have any tips?
I want to use the 2D distribution of the relative permeability of a nonlinear calculation in a linear calculation of the same Model with same parameters etc.
For that I export the data of the relative Permeability, depending on my Parameter (Parametric Sweep) and the coordinates x and y (See attached file "Forum 2.png").
This text file is being imported into the linear model with an interpolation function and the source is set to "file" with 2 arguments!
It is possible to write every single "Position in File" per Hand, but since I want to use ca. 100 Parameter values, this would just take too long.
However, if I want to choose a parameter for the "Position in file" (same parameter as my Parametric Sweep parameter), COMSOL only allows positive integers (See attached File "Forum 1.png")
Do you guys have any tips?
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2 Replies Last Post 8 feb 2013, 04:31 GMT-5
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Posted:
1 decade ago
I use Matlab Livelink to do this. In Matlab, I create a function that reads the 2D data and interpolates. In COMSOL, I call the Matlab function parsing two arguments from COMSOL.
If you don't have Matlab Livelink, you can re-structure your data into 4 columns: (x,y, stage, YourVariable). Your function will now have 3 arguments instead of 2. Of course your will have a huge increase in file size. But I can't think of a better way of doing it in COMSOL only.
If you don't have Matlab Livelink, you can re-structure your data into 4 columns: (x,y, stage, YourVariable). Your function will now have 3 arguments instead of 2. Of course your will have a huge increase in file size. But I can't think of a better way of doing it in COMSOL only.
Please login with a confirmed email address before reporting spam
Posted:
1 decade ago
I use Matlab Livelink to do this. In Matlab, I create a function that reads the 2D data and interpolates. In COMSOL, I call the Matlab function parsing two arguments from COMSOL.
If you don't have Matlab Livelink, you can re-structure your data into 4 columns: (x,y, stage, YourVariable). Your function will now have 3 arguments instead of 2. Of course your will have a huge increase in file size. But I can't think of a better way of doing it in COMSOL only.
Thank you for answering!
At the moment I am not using MATLAB, so I'd like to try out the second solution. The problem is that I don't know how to create a 3D Plot in the Post processor, using my own expressions as arguments. Everything I could find so far is the value of a Variable, with respect to the coordinate system!
But I want the value of the variable depending on two axes of the coordinate system and my parameter...
So I found:
rmm.murZZ(x,y,z)
But I need:
rmm.murZZ(x,y,stage)