Learning Forum

[Gorilla Koala]

I calculated acoustic pressure using 2D LES and FH-W model.
Since I want to identify the whole procedure of calculation, I'm currently use 2D that has less computational cost than 3D.
My question is that somehow the calculated acoustic pressure is too much high and mean pressure seems not to be 0 psi. Would you tell me the possible reason?

[C N]

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

[Gorilla Koala]

Hello CN,

Thank you for the reply. Actually I tried 3D LES, but I got similar result. I'm still not sure why the pressure is significantly higher than static pressure and why the pressure becomes +/- based on 0 psi. 

Thanks.