k-Wave

1. firetripper
   

   Member
   Joined: Sep '13
   Posts: 9

   Dear sir or madam,
   How many grids I need in a wavelength to run the acoustic simulation?
   Best,
   Yu

   Posted 10 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Yu,

   It depends on a number of factors, particularly if your medium is heterogeneous. For linear wave propagation in a lossless and homogeneous medium, the simulation is exact down to 2 points per wavelength, although you'll need at least 3 points per wavelength for the PML to work correctly (see here). For a heterogeneous medium with small variations in the material properties, you'll need 4 or 5 points per wavelength to get accurate reflection coefficients (see here). This will increase for large impedance changes. Finally, if you are trying to represent a curved interface, you may need significantly more to avoid staircasing artefacts. I'd advise doing a convergence test by halving the grid size and checking whether you get the same answer.

   Hope that helps,

   Brad.

   Posted 10 years ago #

3. viku361
   

   Member
   Joined: Jul '20
   Posts: 5

   sir, how can i make curved interfaces. Please give me a solution asap.

   Posted 4 years ago #

4. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi viku361,

   The medium properties in k-Wave are just defined as matrices the same size as the computational grid. So you can use any function to create the curved interface. One way would be to use makeDisc in 2D.

   Brad

   Posted 4 years ago #

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