Hi,
I'm hoping someone can help me. I am new to matlab and K wave, I am looking into the possibliity of using a ultra sound device to measure the length of water droplets and the time taken for them to detach in the context of a chaotic dripping experiment. I have a 10mm diameter piezo disc at the top of a small head tank which has an nozzel in the bottom from which the water drips. I am trying to model how the ultra sound wave proogates through the water and into the droplet also how it reflects from the sides of the head tank so that I can optimise the tank design. Is this possible to do in K wave?
Like I say I'm pretty much a novice so any help would be greatly recieved.
Thank you.
Peter
kWave
A MATLAB toolbox for the timedomain
simulation of acoustic wave fields
Wave propogation through water in a converging aluminium chamber
(3 posts) (2 voices)
Posted 9 years ago #

Hi Peter,
If you are using singlefrequency excitation then I would think that an acoustic finiteelement model of your small tank might be better than using kWave (which is inherently a time domain model), as you only need one frequency and you can define the boundary conditions (the aluminiumwater boundaries) accurately. If you want to model how the drop forms and detaches, ie. the change in the shape of the boundary between the water and the air at the nozzle, then I think you'll need a more elaborate CFD solver.
At the moment kWave only models propagation in fluids. You could probably get an idea of how the waves propagate in the small tank by setting the sound speed and density maps to have the values for aluminium around the outside (ignoring shear waves) and for water in the middle, but the large difference in values may introduce some Gibbstype errors (as kWave uses a Fourier method to calculate gradients). You can set timevarying sources, so the source could be modelled.
Have a look through the examples to get an idea of the sort of thing that kWave can model.
Ben
Posted 9 years ago # 
Hi Ben,
Thank you for your post.I have looked at the examples at first glance it appears that if I can combine the reflection and defraction slit examples I may be able to produce something that resembles a cross section through the chamber to model the propagation in the chamber.
Thank you,
PeterPosted 9 years ago #
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