# \[Archive\] 2D simulations/Symetries
**URL:** https://forum.spis.org/t/archive-2d-simulations-symetries/741
**Category:** SPIS
**Created:** [21 October 2016 11:33 UTC](https://forum.spis.org/t/archive-2d-simulations-symetries/741 "2016-10-21T11:33:00Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@system](https://forum.spis.org/u/system)
#### Post date: [21 October 2016 11:33 UTC](https://forum.spis.org/t/archive-2d-simulations-symetries/741/1 "2016-10-21T11:33:00Z")
Message by **Alexandru Cornogolub** :
Hi is there a way to simulate 2D problems and take into account different symmetries?
Alex
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### Author:  [@system](https://forum.spis.org/u/system)
#### Post date: [31 January 2017 13:23 UTC](https://forum.spis.org/t/archive-2d-simulations-symetries/741/2 "2017-01-31T13:23:00Z")
Message by **Sébastien Hess** :
Depending on your problem you can play with boudary conditions to have faces with reflective or periodic conditions. It is explained in section 3.6 of SPIS-DUST user manual
Sébastien
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### Author:  [@system](https://forum.spis.org/u/system)
#### Post date: [5 April 2017 16:36 UTC](https://forum.spis.org/t/archive-2d-simulations-symetries/741/3 "2017-04-05T16:36:00Z")
Message by **EW** :
When I use reflective boundary conditions, the total energy of my electrons is negative. Is that normal?
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### Author:  [@system](https://forum.spis.org/u/system)
#### Post date: [10 July 2020 13:01 UTC](https://forum.spis.org/t/archive-2d-simulations-symetries/741/4 "2020-07-10T13:01:46Z")