# Can it solve the coupled PDEs in 3D?
**URL:** https://community.freefem.org/t/can-it-solve-the-coupled-pdes-in-3d/2849
**Category:** General Discussion
**Created:** [December 26, 2023, 7:46am UTC](https://community.freefem.org/t/can-it-solve-the-coupled-pdes-in-3d/2849 "2023-12-26T07:46:03Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@okra](https://community.freefem.org/u/okra)
#### Post date: [December 26, 2023, 7:46am UTC](https://community.freefem.org/t/can-it-solve-the-coupled-pdes-in-3d/2849/1 "2023-12-26T07:46:03Z")
Hello, everyone! I’m a new learner of FreeFEM, and I need to solve a reaction-diffusion system, which has two variables, just like the following form:
u\_t=D11\*(△u)+D12\*(△v)+f(u,v),
v\_t=D21\*(△u)+D22\*(△v)+g(u,v),
the △ denotes Laplacian, and the omega is 3D space.
I have watched some tutorial videos, but I haven’t seen similar examples. So, I really want to know if it can slove this kind PDEs, thank you so much!!!
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### Author:  [@frederichecht](https://community.freefem.org/u/frederichecht)
#### Post date: [December 27, 2023, 4:21pm UTC](https://community.freefem.org/t/can-it-solve-the-coupled-pdes-in-3d/2849/2 "2023-12-27T16:21:14Z")
yes not problem ,
first try in 2d more simple,
and choose the time stepping schema.
remark, the numeric depend strongly of the 2 function f and g.
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### Author:  [@okra](https://community.freefem.org/u/okra)
#### Post date: [December 28, 2023, 3:16am UTC](https://community.freefem.org/t/can-it-solve-the-coupled-pdes-in-3d/2849/3 "2023-12-28T03:16:27Z")
Thank you very much for your suggestions!!! I will try!