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Find location of a minimum
Posted Jun 25, 2010, 11:15 a.m. EDT 3 Replies
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Hi,
I am still in the beginner phase with COMSOL and thus have some basic questions regarding the post processing. After the simulationI want to creat a few own "performance coefficients" that need to be programmed. If I am not mistaken this can be achieved via model couplings and I am thus currently exploring those.
Eventually I would like to automate the entire post processing procedure.
The first task sounds very easy but I have not found the right way to do it yet: I want to analayse a quantity along a boundary (lets say the shear stress) and find the position and value of all the local minima.
If those of you who have more experience with these model couplings could share theire knowledge on this, I would be very thankful.
Regards,
Franz
I am still in the beginner phase with COMSOL and thus have some basic questions regarding the post processing. After the simulationI want to creat a few own "performance coefficients" that need to be programmed. If I am not mistaken this can be achieved via model couplings and I am thus currently exploring those.
Eventually I would like to automate the entire post processing procedure.
The first task sounds very easy but I have not found the right way to do it yet: I want to analayse a quantity along a boundary (lets say the shear stress) and find the position and value of all the local minima.
If those of you who have more experience with these model couplings could share theire knowledge on this, I would be very thankful.
Regards,
Franz
3 Replies Last Post Jun 26, 2010, 10:09 a.m. EDT
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Posted:
1 decade ago
Dear Franz, you can use the model coupling to do this. So, to find the minimum stress you would define a minimum model coupling on the boundary of interest then use:
minop1(solid.mises) for the minimum stress
minop1(solid.mises,x) for the x-location of the minimum stress
minop1(solid.mises,y) for the y-location of the minimum stress
minop1(solid.mises,z) for the z-location of the minimum stress
The attached model modifies the wrench model in the model library and computes these values. They are defined under the Derived values node and the numeric values appear in the Results table.
minop1(solid.mises) for the minimum stress
minop1(solid.mises,x) for the x-location of the minimum stress
minop1(solid.mises,y) for the y-location of the minimum stress
minop1(solid.mises,z) for the z-location of the minimum stress
The attached model modifies the wrench model in the model library and computes these values. They are defined under the Derived values node and the numeric values appear in the Results table.
Attachments:
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Posted:
1 decade ago
Thank you very much Daniel, that helped a lot.
But this function, of course, can only determine the local minimum on a boundary. Is there also a way to extend this to local minima if there were several on a single boundary?
Franz
But this function, of course, can only determine the local minimum on a boundary. Is there also a way to extend this to local minima if there were several on a single boundary?
Franz
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Posted:
1 decade ago
Hi
I would try to scan the boundary by some bolean operator to limit the x,y z or r extend, but you must do i "by hand", or the 3.5 way export it back to matlab and write your own algorithm
Good luck
Ivar
I would try to scan the boundary by some bolean operator to limit the x,y z or r extend, but you must do i "by hand", or the 3.5 way export it back to matlab and write your own algorithm
Good luck
Ivar