k-Wave

1. Patrick
   

   Member
   Joined: Jun '19
   Posts: 14

   Hello,

   I am using some code that I have previously successfully used with different geometries to simulate acoustic waves. However, I am getting "maximum supported frequency: 0Hz" no matter what spacial step and temporal step I use. Here is the output of the precomputation:

   Running k-Wave simulation...
     start time: 01-Aug-2019 12:18:09
     reference sound speed: 2117.5333m/s
     WARNING: visualisation plot scale may not be optimal for given source.
     dt: 1ns, t_end: 99.999us, time steps: 100000
     input grid size: 300 by 256 by 238 grid points (60 by 51.2 by 47.6mm)
     maximum supported frequency: 0Hz
     expanding computational grid...
     computational grid size: 350 by 306 by 288 grid points
     WARNING: Highest prime factors in each dimension are 7  17   3
              Use dimension sizes with lower prime factors to improve speed
     precomputation completed in 6.2307s
     saving input files to disk...
     completed in 1.7751s

   As you can see, my dx in all dimensions is 0.2 mm, and my dt is 1ns. This should satisfy c*dt < dx. What am I missing here?

   Thanks,

   PC

   Posted 5 years ago #

2. Patrick
   

   Member
   Joined: Jun '19
   Posts: 14

   I've cracked the case: my model was some solid tissue surrounded by air, but was mostly air and the tissue was uncentered. Even though I made sure to place the driving pressure in the tissue, k-Wave wouldn't work until I centered the tissue and reduced the air around the model.

   Hope this helps someone in the future.

   Posted 5 years ago #

3. Patrick
   

   Member
   Joined: Jun '19
   Posts: 14

   Nope. I was wrong, I had a material with a sound speed unintentionally set to 0 m/s... All fixed now.

   Posted 5 years ago #

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