k-Wave

1. grandjean
   

   Member
   Joined: Nov '14
   Posts: 1

   Hello,
   How to create a free-surface condition along a model's boudary so that Rayleigh waves can be generated?
   Many thanks
   Gilles

   Posted 9 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,640

   Hi Gilles,

   There is currently no general way in k-Wave to enforce a Dirichlet boundary condition (i.e., a pressure-release or solid-vacuum type interface), and thus generate true Rayleigh waves. However, if you're not using a stress source, one option to try is to use the 'dirichlet' source option, and set your source input to be zero, e.g.,

   source.s_mask   = zeros(Nx, Ny);
   source.s_mask(1:Nx/4, :) = 1;
   source.sxx      = zeros(1, kgrid.Nt);
   source.syy      = source.sxx;
   source.sxy      = source.syy;
   source.s_mode   = 'dirichlet';

   You could also try using very small values for the material parameters, or setting the stress to zero explicitly as explained in this post.

   If you come up with a nice solution, I'd be interested to hear about it!

   Brad.

   Posted 9 years ago #

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