Dear Wolfgang,
Thank you a lot for the reply! I am trying to implement the Biot equations
for the propagation of acoustic waves in porous media. The equations are
attached in the "Biot .PNG" file. There are two boundary integrals there,
containing information on work, done by external forces on the fluid and
skeleton part of the media. I want to implement fixed displacement boundary
conditions ("BC.PNG") on a part of the geometry with ID = 2, so I need to
set the displacement components to zero. I was wondering, whether there is
a way to do it similarly to the way it"s done in step-20 example for the
pressure boundary condition (so, in the local_rhs vector).
Please, let me know, if it works so.
Thank you for your support!
With kind regards,
Mariia Bronzova
среда, 29 сентября 2021 г. в 19:23:16 UTC+2, Wolfgang Bangerth:
> On 9/28/21 8:28 AM, Мария Бронзова wrote:
> >
> > After that I am trying to apply the boundary values to the right hand
> > side. This time i should use the *vector_value_list *instead of
> > value_list to get the boundary values assigned. But I am confused about
> > the further proceeding while implementing the locar_rhs part. How can I
> > apply these boundary values in vector form so that the algorithm
> > understands these values need to be assigned exactly to the displacement
> > components?
>
> The first step is always to write out what the weak formulation should
> be. In your case, there will probably be a boundary integral term that
> includes \vec g, the boundary conditions for your vector-valued
> quantity. But how does the rest of the term look like?
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
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