k-Wave

1. Charlie Garcia
   

   Member
   Joined: Mar '18
   Posts: 2

   Hi there,

   I'm having some problems to reproduce a shock-wave (an "N" wave) in a medium. In general I assign a vector containing the wave shape to a source (source.p) but after testing the received signal by a sensor, the shape has changed drastically . Also I tested a one cycle sinus as the input signal and the results are still not as spected. I find always a deformation close to the discontinuity. So my question would be: it's possible in kWave to propagate an specific signal shape, like an N wave or there's any limitation? (besides Nyquist and CFL)

   Thanks in advance!

   Posted 6 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Charlie,

   As you say, the sampling must meet Nyquist. However, for a shock wave (or any wave with a discontinuity in the first derivative), the bandwidth will be infinite. With moving mesh methods (e.g., see our recent paper) you can do a pretty good job simulating a shock front, but this is some way off making it's way into k-Wave.

   In the meantime, I would suggest increasing the sampling. For example, see the Modelling Nonlinear Wave Propagation Example in the MATLAB help browser.

   Hope that helps,

   Brad.

   Posted 6 years ago #

3. Charlie Garcia
   

   Member
   Joined: Mar '18
   Posts: 2

   Thank you Brad,

   Charlie.

   Posted 6 years ago #

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