k-Wave

1. ad000000
   

   Member
   Joined: Feb '17
   Posts: 25

   Hi. As a simple example I model a 2d strip radiating a wavelet pulse into water, with a steel reflector wall at the other end of the grid. I have to set the time scale using the highest velocity in the model, namely steel. This makes things run slowly, and I get numerical dispersion by the time the pulse gets back to the radiator. Is there a way to set different grid spacings or time steps in the two materials, so that the optimal conditions for the modelor exist in each medium?

   Posted 7 years ago #

2. Anthony
   

   Member
   Joined: Apr '13
   Posts: 96

   Hi ad000000,

   From what I know, it is not possible to set a nonuniform grid in k-Wave. You can have a look at this post for more information.

   Anthony

   Posted 7 years ago #

3. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi ad000000,

   If your problem is with numerical dispersion, you might want to consider setting medium.sound_speed_ref to the sound speed in water. While the simulation will no longer be unconditionally stable (you will need to satisfy the CFL condition given in the k-Wave manual), the propagation in the water will be dispersion free.

   Brad.

   Posted 7 years ago #

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