http://www.k-wave.org/forum/topic/grids-in-a-wavelength Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 06:04:59 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/grids-in-a-wavelength#post-7745 Wed, 19 Aug 2020 14:48:44 +0000 Bradley Treeby 7745@http://www.k-wave.org/forum/ <p>Hi viku361,</p> <p>The medium properties in k-Wave are just defined as matrices the same size as the computational grid. So you can use any function to create the curved interface. One way would be to use <a href="http://www.k-wave.org/documentation/makeDisc.php">makeDisc</a> in 2D.</p> <p>Brad </p> http://www.k-wave.org/forum/topic/grids-in-a-wavelength#post-7732 Tue, 11 Aug 2020 08:58:48 +0000 viku361 7732@http://www.k-wave.org/forum/ <p>sir, how can i make curved interfaces. Please give me a solution asap. </p> http://www.k-wave.org/forum/topic/grids-in-a-wavelength#post-4843 Thu, 20 Nov 2014 11:08:10 +0000 Bradley Treeby 4843@http://www.k-wave.org/forum/ <p>Hi Yu,</p> <p>It depends on a number of factors, particularly if your medium is heterogeneous. For linear wave propagation in a lossless and homogeneous medium, the simulation is exact down to 2 points per wavelength, although you'll need at least 3 points per wavelength for the PML to work correctly (see <a href="http://www.k-wave.org/papers/2014-Robertson-IEEEIUS.pdf">here</a>). For a heterogeneous medium with small variations in the material properties, you'll need 4 or 5 points per wavelength to get accurate reflection coefficients (see <a href="http://www.k-wave.org/papers/2012-Treeby-JASA.pdf">here</a>). This will increase for large impedance changes. Finally, if you are trying to represent a curved interface, you may need significantly more to avoid staircasing artefacts. I'd advise doing a convergence test by halving the grid size and checking whether you get the same answer.</p> <p>Hope that helps,</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/grids-in-a-wavelength#post-4839 Mon, 17 Nov 2014 15:46:44 +0000 firetripper 4839@http://www.k-wave.org/forum/ <p>Dear sir or madam,<br /> How many grids I need in a wavelength to run the acoustic simulation?<br /> Best,<br /> Yu </p>