http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 18:27:59 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-6241 Wed, 13 Dec 2017 10:16:26 +0000 Bradley Treeby 6241@http://www.k-wave.org/forum/ <p>Hi Simone,</p> <p>I'm not sure I follow your question. Do you mean how is geometric spreading taken into account in k-Wave? If so, then it's already built into the solution to the wave equation. To put it another way, the wave equation already accounts for geometric spreading, and k-Wave directly solves the wave equation numerically.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-6228 Tue, 12 Dec 2017 02:03:24 +0000 ssternin 6228@http://www.k-wave.org/forum/ <p>Hi Bradley!</p> <p>I am using k-wave for some 2D simulations of wave propagation and I was wondering about how geometrical spreading is taken into account. Do you divide only by sqrt(R), where R is the distance between source and receiver, or you also add some other normalization factors?</p> <p>Thank you,<br /> Simone Sternini </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-5229 Fri, 04 Sep 2015 16:53:27 +0000 Bradley Treeby 5229@http://www.k-wave.org/forum/ <p>Hi tson,</p> <p>Glad to hear that you got a good match with experiments!</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-5217 Mon, 24 Aug 2015 08:51:47 +0000 tson 5217@http://www.k-wave.org/forum/ <p>correction: 3D simulation* </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-5216 Mon, 24 Aug 2015 08:15:41 +0000 tson 5216@http://www.k-wave.org/forum/ <p>Thanks Brad! </p> <p>This is what I expected, because my 2D k-Wave elastic simulation waveforms matched the waveforms I obtained from my experiment exactly (medium was an aluminum block)! The model accurately predicted the amplitudes, time-of-flight, and phase for both longitudinal and shear modes.</p> <p>-T </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-5209 Fri, 21 Aug 2015 10:34:21 +0000 Bradley Treeby 5209@http://www.k-wave.org/forum/ <p>Hi tson,</p> <p>The stress (pressure in the fluid case) in 2D will decay according to 1/sqrt(radius). You can consider anything that you define in 2D as being infinitely extended into the third dimension. For example, a point source in a 2D simulation will act as a cylindrical source. There are some more details in the <a href="http://www.k-wave.org/documentation/example_ivp_photoacoustic_waveforms.php">Photoacoustic Waveforms in 1D, 2D and 3D Example</a>.</p> <p>Brad </p> http://www.k-wave.org/forum/topic/geometrical-spreading-in-2d-simulation#post-5206 Thu, 20 Aug 2015 06:45:19 +0000 tson 5206@http://www.k-wave.org/forum/ <p>Hello everyone,</p> <p>In a 2D k-Wave simulation, for a point-source, should the considered geometrical spreading be 1/r (as a spherical wave as in 3D) or 1/sqrt(r) (as cylindrical wave as in a 2D plate). I am asking because the model is done in 2D, but I did not read anything about plane strain in the 2D elastic model considered.</p> <p>Thanks!</p> <p>-T </p>