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Piezoelectric material in Water Simulation

Posted 16 mars 2015, 19:04 UTC−4 Acoustics & Vibrations, Geometry, Mesh Version 4.4 6 Replies

Miao Meng
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Hi all,

I am trying to build a 3-D PZT 5H cube and put it in water and simulate it to get the impedance vs. frequency. I could build the PZT cube, but found trouble to put it in water.

I am adding a sphere around the PZT cube, but there is always a meshing problem I don't know how to solve.

Could anyone help me on this project?

Thanks in advance!

Miao
6 Replies Last Post 12 juin 2015, 16:36 UTC−4
Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago 16 mars 2015, 19:28 UTC−4
Miao,

there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Miao, there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 10 years ago 17 mars 2015, 11:30 UTC−4
Hi Edgar,

Thanks for your reply. I have attached my model.

Thank you very much in advance and please let me know if you have any questions.

Best,

Miao

Miao,

there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com


Hi Edgar, Thanks for your reply. I have attached my model. Thank you very much in advance and please let me know if you have any questions. Best, Miao [QUOTE] Miao, there might be a chance to help you if you either specify your problem in a more detailed way or (better) upload your model. Clear meshes and solutions to keep it small enough. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com [/QUOTE]

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Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago 18 mars 2015, 05:15 UTC−4
Hi Miao,

I meshed your model with default settings and didn't see any problem.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Hi Miao, I meshed your model with default settings and didn't see any problem. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 10 years ago 18 mars 2015, 10:14 UTC−4
Hi Edgar,

Could you explain briefly how you meshed the model? I am learning to use COMSOL

Thanks,

Miao
Hi Edgar, Could you explain briefly how you meshed the model? I am learning to use COMSOL Thanks, Miao
Edgar J. Kaiser Certified Consultant
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Posted: 10 years ago 18 mars 2015, 10:39 UTC−4

Choose the Mesh tab in the menu bar and click Add Mesh. There are many options of course, but the default setting already generates a mesh. Now you can play with element sizes, shapes, structured mesh options, etc. Meshing is a wide field. You will have to invest some time in playing with the options.

Cheers
Edgar

--
Edgar J. Kaiser
emPhys Physical Technology
www.emphys.com
Choose the Mesh tab in the menu bar and click Add Mesh. There are many options of course, but the default setting already generates a mesh. Now you can play with element sizes, shapes, structured mesh options, etc. Meshing is a wide field. You will have to invest some time in playing with the options. Cheers Edgar -- Edgar J. Kaiser emPhys Physical Technology http://www.emphys.com
Miao Meng
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Posted: 10 years ago 12 juin 2015, 16:36 UTC−4
Hi Edgar,

I am able to get the impedance plot now, but if I put the PZT in air, I can get a clean and nice plot, but if I put PZT in water the impedance plots, both real and imaginary are very noisy. Do you have any ideas why this is happening?

I created a small PZT and put it into a larger block with water. Defined the top surface as terminal with voltage of 1V and bottom surface as ground. Gave the damping loss as 1/Qm=0.013 and dielectric loss of 0.02. ran the simulation and added a 1D plot group, then plotted the real impedance by expression as real(1/acpz.Y11) and the imaginary part as imag(1/acpz.Y11).

Do you see any problem with my method?

Thank you very much for your help.

Miao
Hi Edgar, I am able to get the impedance plot now, but if I put the PZT in air, I can get a clean and nice plot, but if I put PZT in water the impedance plots, both real and imaginary are very noisy. Do you have any ideas why this is happening? I created a small PZT and put it into a larger block with water. Defined the top surface as terminal with voltage of 1V and bottom surface as ground. Gave the damping loss as 1/Qm=0.013 and dielectric loss of 0.02. ran the simulation and added a 1D plot group, then plotted the real impedance by expression as real(1/acpz.Y11) and the imaginary part as imag(1/acpz.Y11). Do you see any problem with my method? Thank you very much for your help. Miao

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