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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 The information provided may be out of date.

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Error during multiphsics

Posted Jan 9, 2014, 9:26 a.m. EST MEMS & Nanotechnology, Acoustics & Vibrations, MEMS & Piezoelectric Devices Version 4.1 4 Replies

Umesh Yadav.
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Hi..
We are try to design saw delay line gas sensor, during the simulation we got error as- Fail to find destination boundaries or destination selection empty please help us to sort out this error.
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uhyadav
4 Replies Last Post Jan 21, 2014, 10:49 a.m. EST
Bryan Adomanis
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Posted: 1 decade ago Jan 9, 2014, 10:09 a.m. EST
Uhyadav:

Uploading the model would be best, but I know when setting up periodic boundary conditions (BCs) this error can occur if COMSOL cannot determine the orientation of the periodicity. For example, setting all four boundaries of a unit cell as periodic under a single BC node--this is wrong, as each boundary pair (the -x/+x faces and -y/+y faces) needs a separate BC implemented.

However, a "gas sensor" model wouldn't seem to need periodic BCs, unless this is a common practice for MEMS. This error also might occur if you are trying to copy a boundary mesh, perhaps? Again, stating more about your error in context with your model will help others better understand your problem.

-Bryan
Uhyadav: Uploading the model would be best, but I know when setting up periodic boundary conditions (BCs) this error can occur if COMSOL cannot determine the orientation of the periodicity. For example, setting all four boundaries of a unit cell as periodic under a single BC node--this is wrong, as each boundary pair (the -x/+x faces and -y/+y faces) needs a separate BC implemented. However, a "gas sensor" model wouldn't seem to need periodic BCs, unless this is a common practice for MEMS. This error also might occur if you are trying to copy a boundary mesh, perhaps? Again, stating more about your error in context with your model will help others better understand your problem. -Bryan
Umesh Yadav.
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Posted: 1 decade ago Jan 19, 2014, 6:21 a.m. EST

we have confusion in setting the periodic condition and ground in case of saw delay line sensor. please he us.


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uhyadav
we have confusion in setting the periodic condition and ground in case of saw delay line sensor. please he us. -- uhyadav
Umesh Yadav.
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Posted: 1 decade ago Jan 20, 2014, 8:23 a.m. EST

we are getting out from BC error, a new error occurs as out of memory in eigenvalue solver.

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uhyadav
we are getting out from BC error, a new error occurs as out of memory in eigenvalue solver. -- uhyadav
Bryan Adomanis
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Posted: 1 decade ago Jan 21, 2014, 10:49 a.m. EST
If this is a 3-D model, you may very well be running out of memory. PBCs on a 3-D model require a great deal of memory (mine usually need more than 32GB of physical memory) and special considerations to the meshing. What are your machine specs?
If this is a 3-D model, you may very well be running out of memory. PBCs on a 3-D model require a great deal of memory (mine usually need more than 32GB of physical memory) and special considerations to the meshing. What are your machine specs?

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