k-Wave

1. quetzl
   

   Member
   Joined: Dec '14
   Posts: 1

   Dear all,

   I would like to simulate the wave propagation in an ultrasonic flow measuring device. The medium (e.g. water) however is in motion and the propagation speed of the wave is the result of the speed of sound as well as the flow speed of the fluid. The fluid flow however is a vector field, not a scalar field like the speed of sound. Is it possible to simulate this with this toolbox, or could the could be adjusted to incorporate this behavior. Would replacing the speed of sound (c) in the code by a vector expression of some sort be a valid approximation?

   Regards,

   Steven

   Posted 9 years ago #

2. ouelletn
   

   Member
   Joined: May '13
   Posts: 18

   Steven,
   It seems like what you are doing is very close to Doppler imaging, in this case you may want to look at other posts about this using the search function in the forums.
   -Andrew

   Posted 9 years ago #

3. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Hi Steven,

   This is an interesting problem. There are a few different approaches you could take. First, you could extend the code to take into account the non-zero background particle velocity. The equations you'd need to solve are outlined by Coulouvrat in this paper. Note the additional terms in the mass and momentum conservation equations compared to those solved in k-Wave.

   Second, you could solve an anisotropic wave equation such as the one described here. If you're not comfortable with coding this up, one option would be to find a general anisotropic elastic wave solver, and use it to just model the compressional wave.

   Finally, as Andrew mentioned, in some situations, you may also be able to model an equivalent situation by moving the source rather than the medium as described in The Doppler Effect Example.

   Hope that helps,

   Brad.

   Posted 9 years ago #

4. tiagodourado
   

   Member
   Joined: Oct '17
   Posts: 9

   Dear k-Wave community,

   I would like to know if there is already a routine or script implemented in k-Wave so that it is possible to insert different velocities per direction to enable simulation in fluids.

   I thank the attention

   Tiago Dourado

   Posted 10 months ago #

5. Bradley Treeby
   

   Developer
   Joined: Mar '10
   Posts: 1,643

   Do you mean source velocities or an anisotropic sound speed? The former is already possible, the latter is not.

   Posted 10 months ago #

6. tiagodourado
   

   Member
   Joined: Oct '17
   Posts: 9

   Thanks for the feedback Bradley Treeby, but I really need the second option.
   I'll try it based on the suggestions you gave in the previous comment.

   Grateful

   Tiago Dourado

   Posted 10 months ago #

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