Absorbing boundary at only one face

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esaez
Posts: 4
Joined: Wed Nov 02, 2022 2:39 pm

Absorbing boundary at only one face

Post by esaez » Thu Nov 10, 2022 7:42 pm

Dear Team,

I have a 3D wave propagation model with internal source and I want to absorb the wave only at one face of the model. I have tried using the ASDAbsorbingBoundary3DAuto element, but apparently only works if it is assigned to the entire outer boundary of the domain. I also tried using an absorbing volume with the ASDAbsorbingBoundary3D option but it was impossible to achieve convergence. Could you give me some suggestions please ?

Thank you very much

STKO Team
Posts: 1589
Joined: Tue Oct 29, 2019 8:45 am

Re: Absorbing boundary at only one face

Post by STKO Team » Mon Nov 14, 2022 8:12 am

If you only want to absorb outgoing waves coming from an internal source, you can simply use the DristributedLK3D condition.

If you share your model and a sketch of what you want to do we can help you

esaez
Posts: 4
Joined: Wed Nov 02, 2022 2:39 pm

Re: Absorbing boundary at only one face

Post by esaez » Tue Nov 22, 2022 12:20 am

Thank you very much, DristributedLK3D solved the issue :P

STKO Team
Posts: 1589
Joined: Tue Oct 29, 2019 8:45 am

Re: Absorbing boundary at only one face

Post by STKO Team » Tue Nov 22, 2022 7:48 am

Exactly.
The DistributedLK are just L-K dashpots, whose aim is to absorb outgoing waves.

The ASDAbsorbingBoundary instead is an assembly of a Free-field column (to impose the 1D free-field motion) and LK dashpots to absorb outgoing waves. It should be used when the input comes from outside the domain

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