Hi,
I am trying to model the acoustic pressure in tissue when a transducer is applied to the skin. I am using a line source and I have noticed that the sound is omnidirectional. Is it possible to model the source so that acoustic is produced only on one side of the source?
Thank you
Hi Nicole,
There are two types of sources that are implemented in k-Wave. Pressure sources correspond to the injection of mass and act as monopoles. Velocity sources correspond to the injection of force and act as dipoles. Sources you see in the real world will generally be one of these. However, real-world sources often also include some kind of reflective or absorbing backing that causes the waves to only be emitted in one direction. To model this behaviour, you could also include this backing into your simulation. For a plane wave, another option would be to set both the velocity and pressure field so the wave only travels in one direction. Alternatively (and perhaps the best option in practice), you could just place your source near the edge of the domain and not worry about the wave that travels in the opposite direction.
Hope that helps,
Brad.
Hello,
How can I set initial velocity in k-wave? I would like to model directional transmitter that generates stronger waves in certain direction that in others.
Sensor directivity seems to be for the purpose of my simulation, but I also need directivity on transmitter side.
Hi Warmonger,
To set a velocity source, you need to define source.u_mask and source.ux (etc). There is more information in the Dipole Point Source In A Homogeneous Propagation Medium Example, and in the k-Wave manual.
Brad.
Thank you, that worked it seems :)
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