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real and imaginary computations in comsol
Posted 21 nov. 2009, 01:00 UTC−5 2 Replies
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Hello
I have been trying to run piezoelectric resonator and filter simulations in COMSOL for a while now. I am able to plot the Admittance curve. However when I use this for further calculations in the 'global expression section' COMSOL only takes the real value ignoring the complex part of the solution.
In case of confusion let me define my problem differently:
I have 4 solutions from the simulation which have both real and imaginary parts. The solution that I want is some arithmetic function of these 4. How can I do this by writing a Global expression? Is there any other way in COMSOL?
Currently, I am able to export both the real and imaginary part of the data by specifically plotting each (using either real or imag options) into a .txt
Using spreadsheet software I can do the complex number calcualtions that I need. But the process is painstakingly slow.
Anyone has an idea, about how to tackle this problem within comsol itself. In the worst case, can I write a matlab function which will automatically take the data every time I run the simulation and update the plot accordingly?
Thanks
Vikram Thakar
I have been trying to run piezoelectric resonator and filter simulations in COMSOL for a while now. I am able to plot the Admittance curve. However when I use this for further calculations in the 'global expression section' COMSOL only takes the real value ignoring the complex part of the solution.
In case of confusion let me define my problem differently:
I have 4 solutions from the simulation which have both real and imaginary parts. The solution that I want is some arithmetic function of these 4. How can I do this by writing a Global expression? Is there any other way in COMSOL?
Currently, I am able to export both the real and imaginary part of the data by specifically plotting each (using either real or imag options) into a .txt
Using spreadsheet software I can do the complex number calcualtions that I need. But the process is painstakingly slow.
Anyone has an idea, about how to tackle this problem within comsol itself. In the worst case, can I write a matlab function which will automatically take the data every time I run the simulation and update the plot accordingly?
Thanks
Vikram Thakar
2 Replies Last Post 22 nov. 2009, 14:12 UTC−5
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Posted:
2 decades ago
Hi
there are a few discussion about complex values out here i.e. see:
Error: 6199 Attempt to evaluate real square root of negative number for the most recent
but you will find many other by typing "complex" or "imaginary" in the search tab, this might well give sou some clues and interesting info.
Good luck
Ivar
there are a few discussion about complex values out here i.e. see:
Error: 6199 Attempt to evaluate real square root of negative number for the most recent
but you will find many other by typing "complex" or "imaginary" in the search tab, this might well give sou some clues and interesting info.
Good luck
Ivar
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Posted:
2 decades ago
Hello Ivar,
Thanks a lot for your help. I got the model to work.
Regards,
Vikram
Thanks a lot for your help. I got the model to work.
Regards,
Vikram