# Can FF + + solve the problem of multiple physical fields? For example, a piezoelectric composite plate structure

**URL:** https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959
**Category:** General Discussion
**Created:** [August 24, 2022, 12:18pm UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959 "2022-08-24T12:18:03Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Yangshen](https://avatars.discourse-cdn.com/v4/letter/y/838e76/32.png) [@Yangshen](https://community.freefem.org/u/Yangshen)
#### Post date: [August 24, 2022, 12:18pm UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959/1 "2022-08-24T12:18:03Z")

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Hello everyone  
 ![image](https://canada1.discourse-cdn.com/flex030/uploads/freefem/original/2X/8/8e174abbee6edff0acd185ab7aabb387f479b019.png)

As shown in the figure, the top layer is piezoelectric material and the bottom layer is matrix. If an electric field is applied to the piezoelectric material,

I don’t know how I can push to the weak form of this problem

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### Author: ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)
#### Post date: [August 24, 2022, 12:20pm UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959/2 "2022-08-24T12:20:35Z")

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Yes, it can. Please read the documentation and the examples.

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### Author: ![Yangshen](https://avatars.discourse-cdn.com/v4/letter/y/838e76/32.png) [@Yangshen](https://community.freefem.org/u/Yangshen)
#### Post date: [August 25, 2022, 1:09am UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959/3 "2022-08-25T01:09:19Z")

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Thank you very much.I am a fresher about FF++.

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### Author: ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)
#### Post date: [August 25, 2022, 1:03pm UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959/4 "2022-08-25T13:03:01Z")

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You ca see with Pascal Ventura for compiling piezo exemple  
the mail is : [pascal.ventura@univ-lorraine.fr](mailto:pascal.ventura@univ-lorraine.fr)

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### Author: ![Yangshen](https://avatars.discourse-cdn.com/v4/letter/y/838e76/32.png) [@Yangshen](https://community.freefem.org/u/Yangshen)
#### Post date: [October 2, 2022, 7:27am UTC](https://community.freefem.org/t/can-ff-solve-the-problem-of-multiple-physical-fields-for-example-a-piezoelectric-composite-plate-structure/1959/5 "2022-10-02T07:27:53Z")

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I’m sorry to bother you again. I follow [https://doc.freefem.org/\_static/pdf/FreeFEM-doc-v3\_Chinese.pdf#section.4.8](https://doc.freefem.org/_static/pdf/FreeFEM-doc-v3_Chinese.pdf#section.4.8) See some examples. However, no piezoelectric related examples were found.