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Automatically enable/disable constraints/intial values basing on the study step
Posted 27 févr. 2018, 07:30 UTC−5 Structural & Acoustics, Geometry, Parameters, Variables, & Functions Version 5.3 2 Replies
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Dear community, I'm Giulio and I'm fairly new to comsol.
My problem is quite simple but, at the moment, I'm not able to find a solution elsewhere.
My study has this structure: 1) Eigenfrequency study of a part (lets call it A) of the system to find its eigenmodes. 2) Use the eigenmodes of A as initial values for A in a time dependent study of the whole system. (in my case I use withsol('sol1',w,setind(lambda,3)), for instance, to select the z-compontent of the displacemente of the third auto-mode).
I want to re-iterate this process with a parameter sweep, changing the size of A. Therefore I have to repeat the eigenfrequency study for each parameter value, to retrieve the eigen-displacement of A.
Is there a way to (1) disable a part of the geometry and initial values node=> perform eigenfrequency study (2) enable all the geometry AND initial values for A => perform t-dependent study in an automatic way (parameter study?).
Otherwise, the solution, migh be study all the eigenmodes for all the parameters in a first time and perform all the t-dep studies in a second time. But it involves twice the meshing and it's probably not the best way to proceed.
Thank you masters.
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Hi Giulio,
Is the option "Modify model configuration for study step" in the Study Step configuration can do what you want ? Parts of the model can be activated of disabled here ...
Best regards, Etienne
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Hi Giulio,
Is the option "Modify model configuration for study step" in the Study Step configuration can do what you want ? Parts of the model can be activated of disabled here ...
Best regards, Etienne
It is. I very apologise for having not noticied it by myself. Btw I'm using the version 6.3 of comsol and I only have the possibility to change the physics and not the geometry. However i suppressed the unwanted automodes fixing the displacement of the notA part to 0 .
Now I had another trouble: I change a geometrical feature on A and I perform the parametric eigenmode study. After that I want to study its first 3 eighenmodes with a time dependent solver.
I can't find a way to perform a parameter sweep only on a study step. Furthermore, every time i change the n (eigenmode number) the solver restart with a new mesh, even though nothing changed on the geometry of the system.
Thank you very much for your help. :)