http://www.k-wave.org/forum/topic/nonlinear-acoustics Support for the k-Wave MATLAB toolbox en-US Tue, 12 May 2026 22:32:34 +0000 http://bbpress.org/?v=1.0.2 q http://www.k-wave.org/forum/search.php http://www.k-wave.org/forum/topic/nonlinear-acoustics#post-7598 Sat, 13 Jun 2020 12:41:40 +0000 Bradley Treeby 7598@http://www.k-wave.org/forum/ <p>This combination of sound speed and shock parameter etc gives a negative value for B/A, so I guess the simulation becomes unstable. Try setting:</p> <pre><code>p0 = 50e3; % source pressure [Pa] c0 = 150; % sound speed [m/s] rho0 = 1000; % density [kg/m^3] alpha_0 = 2; % absorption coefficient [dB/(MHz^2 cm)]</code></pre> <p>Brad </p> http://www.k-wave.org/forum/topic/nonlinear-acoustics#post-7586 Tue, 09 Jun 2020 15:08:25 +0000 btj 7586@http://www.k-wave.org/forum/ <p>In same demo “example_na_modelling_nonlinearity”，After a short time the data disappeared when i set the speed of sound to 150,What caused this? </p> http://www.k-wave.org/forum/topic/nonlinear-acoustics#post-7564 Sat, 06 Jun 2020 14:52:33 +0000 Bradley Treeby 7564@http://www.k-wave.org/forum/ <p>It is the number of wavelengths between the source and sensor. To convert to metres, multiply by the size of the wavelength.</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/nonlinear-acoustics#post-7530 Wed, 27 May 2020 10:35:57 +0000 btj 7530@http://www.k-wave.org/forum/ <p>In example_na_modelling_nonlinearity,what is 'wavelength_separation=15' physical unit </p>