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Temperature effect on Eigenfrequency
Posted Aug 1, 2016, 8:51 a.m. EDT 1 Reply
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Hello!
I am a master student doing a simulation of a ophononic crystal in Comsol 5.2.
I use Solid mechanics and heat transfer in solids moduls.
The model is a simple phononic crystal, square lattice, that have a boundaty heat source and surface emmision. I have study 1 to solve for eigenfrequency and study 2 to solve for heating, study 2 is time dependent.
The results looks good i get the complete band structure and i can see heating of the model.
The problem i have is to connect this two studies to eachother, i want to see how the band stucture change when the model gets heated.
For example, t=0, T=293K results in one band structure
t=5, T=350K should result in another looking band structure and so on.
With kind regards
Olivier
I am a master student doing a simulation of a ophononic crystal in Comsol 5.2.
I use Solid mechanics and heat transfer in solids moduls.
The model is a simple phononic crystal, square lattice, that have a boundaty heat source and surface emmision. I have study 1 to solve for eigenfrequency and study 2 to solve for heating, study 2 is time dependent.
The results looks good i get the complete band structure and i can see heating of the model.
The problem i have is to connect this two studies to eachother, i want to see how the band stucture change when the model gets heated.
For example, t=0, T=293K results in one band structure
t=5, T=350K should result in another looking band structure and so on.
With kind regards
Olivier
1 Reply Last Post Aug 10, 2016, 11:08 a.m. EDT
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Posted:
8 years ago
Hi Oliver,
this is indeed not straightforward. The reason is that the eigenfrequency solver cannot take dynamic data sets as input (for example a vector of time steps). It can only take one linearization point. Luckily, you can work around this by clever usage of a parametric sweep. See the attached example:
-------------------------------------------
cds.comsol.com/mg/a57ab42a688d02.zip
Estimated size: 39.8 MB
This link expires August 17, 2016. Please make sure to download before that date.
Included files:
- transient-eigenfrequency.mph
-------------------------------------------
Niklas
this is indeed not straightforward. The reason is that the eigenfrequency solver cannot take dynamic data sets as input (for example a vector of time steps). It can only take one linearization point. Luckily, you can work around this by clever usage of a parametric sweep. See the attached example:
-------------------------------------------
cds.comsol.com/mg/a57ab42a688d02.zip
Estimated size: 39.8 MB
This link expires August 17, 2016. Please make sure to download before that date.
Included files:
- transient-eigenfrequency.mph
-------------------------------------------
Niklas
Hello!
I am a master student doing a simulation of a ophononic crystal in Comsol 5.2.
I use Solid mechanics and heat transfer in solids moduls.
The model is a simple phononic crystal, square lattice, that have a boundaty heat source and surface emmision. I have study 1 to solve for eigenfrequency and study 2 to solve for heating, study 2 is time dependent.
The results looks good i get the complete band structure and i can see heating of the model.
The problem i have is to connect this two studies to eachother, i want to see how the band stucture change when the model gets heated.
For example, t=0, T=293K results in one band structure
t=5, T=350K should result in another looking band structure and so on.
With kind regards
Olivier