k-Wave

1. DNF
   

   Member
   Joined: Feb '14
   Posts: 11

   Hi. I'm simulating elastic propagation in strongly heterogeneous media (i.e. steel plate immersed in fluid). The large contrast in sound velocity causes the simulations to be extremely time-consuming, and it would be very interesting to make use of non-uniform grids. The kWaveGrid class has a nonuniform property and some methods for specifying and handling such grids, but I cannot find any examples of its use, nor a very clear description of input parameters to the setNUGrid method.

   * Am I correct in thinking that using non-uniform grids would be an appropriate strategy in strongly heterogeneous media, in that it would reduce execution time?
   * Can pstdElastic2D handle non-uniform grids?
   * How do I use the method setNUGrid?
   (* Oh, btw, is there any progress on an updated user manual? :)

   Posted 10 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi DNF,

   Thanks for your query. Using a non-uniform grid is a sensible thing to try for media with large changes in the material coefficients. Unfortunately, at this point, the use of non-uniform grids is not a supported feature. With the current version (1.1) it is possible to use nonuniform grids via the undocumented kgrid.setNUGrid method, but this only works in 1D (the nonuniform grid code is not currently included in kspaceFirstOrder2D and kspaceFirstOrder3D or in the elastic codes). We are currently working on expanding this, but a revised version might be some time away. We are also intending to update the manual (particularly to include the elastic code), but that won't be until the new year.

   Brad.

   Posted 10 years ago #

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