Overhang Cavity Acoustics : Helmholtz Frequency Calculation
 

Hi,

I am working on CFD simulation of overhang cavity acoustics, a problem statement given in NASA's 3rd CAA workshop. I calculated vortex-shedding frequency from well known Rossister's formula.
I want to calculate Helmholtz frequency of the overhang cavity. Can anyone suggest me about the formulation for this.

Thanks and Regards
Ashish Singh