k-Wave

1. motim
   

   Member
   Joined: Apr '13
   Posts: 2

   Hi,

   I would like to simulate a structure with time varying properties. For example I have a fixed source, emitting a sine wave and in the medium I have a moving disc.

   thanks

   Posted 11 years ago #

2. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Unfortunately there is no direct way to assign time-varying medium properties in the current release (without modifying the source code). For the simulation you mention, one possibility would be to move the source rather than the medium, similar to the doppler effect example in the toolbox.

   Brad.

   Posted 11 years ago #

3. motim
   

   Member
   Joined: Apr '13
   Posts: 2

   Unfortunately I need a time varying reflection in the medium
   Thanks

   Posted 11 years ago #

4. bashjokh
   

   Member
   Joined: Apr '14
   Posts: 5

   Hi,

   would you give me a hint where can I start modifying the source code to deal with time-varying medium properties. For example, I have a body moving inside the medium and I want to model the movement of the body inside the computational grid.

   Thanks,

   Posted 10 years ago #

5. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi bashjokh,

   In the current version of k-Wave (V1.0), there is no way to change the medium properties over time. However, a stationary source and a moving reflector can also be modelled as a moving source and a stationary reflector, in which case you could look at the Doppler Effect example.

   If you are comfortable with MATLAB, you could also try changing the simulation functions directly to allow the values of medium.sound_speed and medium.density to change over time. For example, you could try shifting the medium properties at the start of the time loop using circshift (the time loops starts around line 741 in kspaceFirstOrder2D).

   Hope that helps,

   Brad.

   Posted 10 years ago #

6. babakkh
   

   Member
   Joined: Feb '17
   Posts: 10

   I was wondering if it is possible to change the source code to include time varying medium. The problem is that the governing equations will change and therefore almost all the equations in the source code need to be modified.

   Do you have any suggestion how to change the governing equations and use kspace?

   Thanks for your time,

   Best regards,

   Babak

   Posted 7 years ago #

7. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Babak,

   Unfortunately this is non-trivial, and not something that we are currently working on. Best of luck!

   Brad.

   Posted 7 years ago #

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