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Hello,

I recommend you not to use 2D LES model as it is highly non physical and it does not take into account the 3D effects Because it uses some filtered equations and instead use RANS model in 2D if you want to save computational time as it will yield more accurate results where it uses average values in its equations.Hope this helps you.This might me the reason you are getting high values of acoustic pressure.For further understanding please refer to this link

20.2. Using the Ffowcs Williams and Hawkings Acoustics Model (ansys.com)

if you cannot access it kindly refer this link 

https://forum.ansys.com/forums/topic/using-help-with-links/#latest

 

 

Thanks