http://www.k-wave.org/forum/topic/nonlinear-propagation-in-air Support for the k-Wave MATLAB toolbox en-US Wed, 13 May 2026 14:18:29 +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-propagation-in-air#post-5893 Mon, 17 Apr 2017 18:31:55 +0000 s165 5893@http://www.k-wave.org/forum/ <p>Hi Brad,</p> <p>Is it possible to continue this via email? The reason I ask is that I'd like to provide more detail but I'm currently working for a company where some of that information is confidential -- so posting about it on a forum wouldn't be the best course. Obviously if we the source of our issue I'll come back here to post it in case someone has a similar problem in future.</p> <p>If that doesn't work for you then I'll do my best to answer here. For now I've sent an email to the address listed on your UCL page.</p> <p>Thanks,<br /> Stephen </p> http://www.k-wave.org/forum/topic/nonlinear-propagation-in-air#post-5886 Sun, 09 Apr 2017 13:34:18 +0000 Bradley Treeby 5886@http://www.k-wave.org/forum/ <p>Hi s165,</p> <p>I can't immediately think of why this wouldn't work in air. Some general questions / things to check:</p> <p>1. Are you inputing the same nonlinearity parameter (BonA vs beta)<br /> 2. Is the waveform shocked?<br /> 3. Does the k-Wave simulation have sufficiently small grid size to support the nonlinear harmonics?<br /> 4. Do they both have the same level of absorption?<br /> 5. Is the field from a focused transducer (if so, what's the level of focusing)?</p> <p>Brad. </p> http://www.k-wave.org/forum/topic/nonlinear-propagation-in-air#post-5884 Wed, 05 Apr 2017 23:22:23 +0000 s165 5884@http://www.k-wave.org/forum/ <p>Hi,</p> <p>k-Wave is obviously developed with medical ultrasound/PA in mind and I'm wondering if there are any simplifying assumption that might make it not work when simulating propagation through air. Nothing I've read seems to indicate that, however, I have had issues when adding nonlinearities to a simulation. Without BonA, the k-Wave on-axis pressure curve (of the fundamental) matches will with a simulation run using KZK. Once I add in nonlinearities via BonA = 0.4, the fall off from when the pressure hits its peak becomes very rapid. The near-field still matches well.</p> <p>I can provide more details, just let me know what you need.</p> <p>NB. I'm running the C++ version of the code. </p>