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[Zoha]

Hello guys,

I want to calculate hemholtz resonance frequency and compare it with the formula below. I have some question related to this problem.

1. Which analysis should I use? Modal Acoustic or Harmonic Acoustic?
2. Which body should be defiend as an Acoustic Region? Neck or Cavity?
3. What boundry coniditions should I apply? Pressure and ..?
4. 

[Ashish Khemka]

Hi,

Try using a modal analysis. Define Cavity as the Acoustic Region. I think you do not need to apply any b.c. The modal analysis will give you the natural frequencies of vibration for the cavity.

Regards,

Ashish Kumar

[Zoha]

Hi Ashish Kumar, 

 

Thank you for  your quick reply.

 

When I define only cavity as the acoustic region, I got this.

 

I have to choose both cavity and neck as the acoustic regions in order to get result.

Moreover, when I don't apply pressure I get different frequency from the formula.

 

regards.