# Boundary conditions

**URL:** <https://opentelemac.org/forum/t/boundary-conditions/7025>\
**Category:** TOMAWAC\
**Created:** [October 21, 2022, 11:40pm UTC](https://opentelemac.org/forum/t/boundary-conditions/7025 "2022-10-21T23:40:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![user\_16549](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/ea5d25/32.png) [@user\_16549](https://opentelemac.org/forum/u/user_16549)\
**Post date:** [October 21, 2022, 11:40pm UTC](https://opentelemac.org/forum/t/boundary-conditions/7025/1 "2022-10-21T23:40:33Z")

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Hello [name removed] am trying to run a coupled simulation with telemac and tomawac and I have a problem with

my tomawac boundary conditions file.

I have 2 open boundaries and the direction is northwest so I apply 544 In the boundary where the waves enter in my domain. My question concerns my other south boundary where the wave arrives. It is an open boundary. Can I apply 222 in that boundary ? Do I have to specify something in order for tomawac to understand that this is an open boundary or it doesn’t matter. Between these 2 boundaries there are two closed ones(my shoreline and a part of an island). With 544 in my upper open boundary and 222 in my second open boundary the results seem to make sense but I’m not sure if 222 is correct.

Georgia

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**Author:** ![user\_8473](https://opentelemac.org/forum/letter_avatar_proxy/v4/letter/u/8c91f0/32.png) [@user\_8473](https://opentelemac.org/forum/u/user_8473)\
**Post date:** [October 24, 2022, 9:07am UTC](https://opentelemac.org/forum/t/boundary-conditions/7025/2 "2022-10-24T09:07:45Z")

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Hello

Yes 2 2 2 is the correct boundary condition for a shoreline.

As for your south boundary you can apply 2 2 2 too, there is nothing else to specify.

[name removed]