http://www.k-wave.org/forum/topic/grid-dimensions-in-3d Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 23:07:31 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/grid-dimensions-in-3d#post-5935 Sun, 21 May 2017 16:04:18 +0000 Bradley Treeby 5935@http://www.k-wave.org/forum/ <p>Hi samantp,</p> <p>That doesn't seem to be expected behaviour. Are the source and sensor definitely outside of the PML? If you post your code, I will take a look.</p> <p>Brad </p> http://www.k-wave.org/forum/topic/grid-dimensions-in-3d#post-5929 Thu, 18 May 2017 19:07:23 +0000 samantp 5929@http://www.k-wave.org/forum/ <p>Hi,<br /> I am trying to write a pretty simple (in principle) simulation. I have an acoustic point source, and I want to analyze how the resulting pressure evolves as it moves through space.</p> <p>Currently I have Nx=512, Ny=Nz=64. The point source is at (in grid points) x=15, y=z=32. i.e. it's in the center of the yz plane. I have sensors along the x direction at x=15:497 and y=z=32.</p> <p>There is no attenuation or heterogeneity in the medium, however I am noticing what seem to be numerical artifacts in the pressure as it propagates, illustrated here: <a href="http://imgur.com/a/zBcLM" rel="nofollow">http://imgur.com/a/zBcLM</a></p> <p>I notice that if I make Ny and Nz larger (comparable to Nx), then these artifacts are less prominent. However, this doesn't seem to me. I would think that for wave propagation in the x direction, the size of the y and z grids shouldn't matter. </p> <p>I was just wondering why these artifacts occur, and how they can be mitigated. Am I correct in my assessment that a larger Ny and Nz should work? (at the cost of computation time)</p> <p>Thank you! </p>