Help with my acoustic anylize

[Budda]

Hi,
First of all I would like to apologize for all my mistakes which I will make during this post. My english in writting is not good enough.
My task is to determine an influence of ballon on the acoustic in the room.
http://imageshack.us/f/7/siatkae.jpg/ i drew this in gmsh program, made a mesh, and opened by ElmerGUI.
I don't know what to do now? First problem is with equation. I know i have to use helmholtz equation. But how to define it? Angular frequency? I don't know how to define a source of my acoustic ( noise)
To be perfectly honest , I don't think I have any chance of success. I don't know how to define all parameters in order to receive work analyze.
I will be greatfull for any advice. I hope I made my problem clear.
Thanks a lot for any help.
BR
Budda

[mzenker]

Hi,

I think you should first have a look at the Elmer documentation which you can find here:
http://www.csc.fi/english/pages/elmer/documentation
Especially the ElmerGUI manual and the Models manual should be of interest.

HTH,

Matthias

[Budda]

Thank You.
I didn't see this before. It will be helpfull.
Thanks a lot again.
BR
Budda

[Budda]

Hi,
Can someone tell me what the difference between pressure.wave.1 and pressure.wave.2 in Helmholtz equation in my simulation result. If i want to check acoustic in room, which pressure will the resuslts?
Thanks a lot for any help
Budda

[raback]

Hi

The difference is sqrt(-1) So the 1st component is the real part and the 2nd component is the imaginary part.

-Peter

[Budda]

So i have to look in real part ? sorry of asking but i am not good in acoustic

[raback]

Or perhaps the absolute value: |z|=sqrt(Re(z)^2+Im(z)^2). Hard to say without knowing the objective. -Peter