http://www.k-wave.org/forum/topic/variable-grid-spacing Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:27:53 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/variable-grid-spacing#post-5902 Wed, 26 Apr 2017 20:06:35 +0000 Bradley Treeby 5902@http://www.k-wave.org/forum/ <p>Hi ad000000,</p> <p>If your problem is with numerical dispersion, you might want to consider setting <code>medium.sound_speed_ref</code> 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.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/variable-grid-spacing#post-5891 Wed, 12 Apr 2017 07:46:38 +0000 Anthony 5891@http://www.k-wave.org/forum/ <p>Hi ad000000,</p> <p>From what I know, it is not possible to set a nonuniform grid in k-Wave. You can have a look at <a href="http://www.k-wave.org/forum/topic/nonuniform-grids#post-4860">this post</a> for more information.</p> <p>Anthony </p> http://www.k-wave.org/forum/topic/variable-grid-spacing#post-5888 Mon, 10 Apr 2017 20:56:43 +0000 ad000000 5888@http://www.k-wave.org/forum/ <p>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? </p>