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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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geometric parameter sweep

Posted Aug 29, 2012, 8:56 a.m. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices Version 4.2a 5 Replies

Mohanad Zaki
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Greetings everyone,


I'm running some stationary simulations using the MEMS module.
I would like to make a parametric sweep for a certain geometric variable.

The problem is that when changing this variable manually or automatically (sweep), the domains get messed up, e.g. materials assigned to domains get mixed up, the same occurs for the boundary and initial conditions, and all of this would have to be re-assigned manually.

My geometry contains one imported component (is it the cause of the problem ?)

Any suggestions on how this can be fixed ?

Regards,


5 Replies Last Post Aug 30, 2012, 8:18 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Aug 29, 2012, 8:59 p.m. EDT
Hi

one rule with geometrical sweep is NOT to change topology, because then COMSOL need to reorder the entity ID's and that tend to go wrong

--
Good luck
Ivar
Hi one rule with geometrical sweep is NOT to change topology, because then COMSOL need to reorder the entity ID's and that tend to go wrong -- Good luck Ivar
Certified Consultant
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Posted: 1 decade ago Aug 30, 2012, 10:16 a.m. EDT
Create a selection by right-clicking the Geometry node and select Object Selection that will base the selection on geometry entities rather than domain numbers, and can help you specify exactly what selections are created in the final geometry, even if topology changes happen during the
sweep.

The Gecko Foot example demonstrates how to use this feature.
Model Library path: MEMS_Module/Actuators/gecko_foot

regards, Niklas
Create a selection by right-clicking the Geometry node and select Object Selection that will base the selection on geometry entities rather than domain numbers, and can help you specify exactly what selections are created in the final geometry, even if topology changes happen during the sweep. The Gecko Foot example demonstrates how to use this feature. Model Library path: MEMS_Module/Actuators/gecko_foot regards, Niklas
Jeff Hiller COMSOL Employee

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Posted: 1 decade ago Aug 30, 2012, 11:38 a.m. EDT
...And for those without the MEMS Module, check out this link:

www.comsol.com/showroom/documentation/model/1434/
...And for those without the MEMS Module, check out this link: http://www.comsol.com/showroom/documentation/model/1434/
Mohanad Zaki
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Posted: 1 decade ago Aug 30, 2012, 12:58 p.m. EDT
Thank your everyone for your replies.


Regards,

Thank your everyone for your replies. Regards,
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Aug 30, 2012, 8:18 p.m. EDT
Hi Niklas

Thanks for the hint, I had noticed that when using selection goups (something I tend to do) COMSOL was far better to follow major changes in the geometry. So probably I should change my pre v4.2 learned "rule" of NOT changing topology, and now COMSOL also accept topology changes, that is great ;)


--
Good luck
Ivar
Hi Niklas Thanks for the hint, I had noticed that when using selection goups (something I tend to do) COMSOL was far better to follow major changes in the geometry. So probably I should change my pre v4.2 learned "rule" of NOT changing topology, and now COMSOL also accept topology changes, that is great ;) -- Good luck Ivar

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