k-Wave

1. s165
   

   Member
   Joined: Jul '14
   Posts: 2

   Hi,

   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.

   I can provide more details, just let me know what you need.

   NB. I'm running the C++ version of the code.

   Posted 7 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi s165,

   I can't immediately think of why this wouldn't work in air. Some general questions / things to check:

   1. Are you inputing the same nonlinearity parameter (BonA vs beta)
   2. Is the waveform shocked?
   3. Does the k-Wave simulation have sufficiently small grid size to support the nonlinear harmonics?
   4. Do they both have the same level of absorption?
   5. Is the field from a focused transducer (if so, what's the level of focusing)?

   Brad.

   Posted 7 years ago #

3. s165
   

   Member
   Joined: Jul '14
   Posts: 2

   Hi Brad,

   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.

   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.

   Thanks,
   Stephen

   Posted 7 years ago #

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