k-Wave

1. certainlyK
   

   Member
   Joined: Jul '15
   Posts: 2

   1. Hi , I have to model a "helmholtz resonator in 2D. but I don't know how to model the resonator like figure in http://blog.naver.com/atreyu26/220440007272.
   and the resonator is made of boolean operations union with three rectangular in COMSOL 4.4.

   2. How can I make boundary conditions? left end(coordinate : x=0) is plane wave radiation or pressure condition(p0=1[Pa], p(t)=p0*sin(2*pi*frequency*t)). right end(coordinate : x=0.3) is
   anechoic termination. target frequency are 500Hz, 1000Hz, 1500Hz.

   3. Last, I need to detect or probe measured acoustic pressure at left end(x=0) and right end(x=0.3).

   Thank you for reading. please help me.

   Posted 9 years ago #

2. Anthony
   

   Member
   Joined: Apr '13
   Posts: 96

   Hi certainlyK,

   First of all, if you didn't, I suggest you to play with the examples (and read the user manual, which is very helpful). You will find different ways to set the source term (basically, set source.p to your input time signal).

   Then, I suggest you to read this post "entitled Room enclouse acoustic simulation" from which you should be able to do what you want (basically, use dirichlet boundary conditions where you want reflections).

   For the absorbing walls, simply don't put any boundary conditions and the PML will do the job.
   To record the signal where you want, you can set sensor.mask to a boolean matrix of the size of you computational domain and set it to true where you want to record the signal. At the beginning, I advise you to record the output everywhere in the domain so you can check if the wave behaves as you expect.

   Hope it helps :-)
   Anthony

   Posted 9 years ago #

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