Some questions concerning direct Aeroacoustical simulations using Fluent

Alae · June 10, 2013, 06:17

Hello everybody,

I'm a beginner user of Fluent, and I have to perform some aeroacoustical calculations, so I would be very grateful if someone could help me.

I'm studying jet noise produced by an in-duct hot (90 degrees Celsius) air injector. A mesh of the injector has already been done for aerodynamic calculations. And I want to use this model to do direct aeroacoustical calculations.

1) Is it ok to use the same mesh?
2) After a lot of research, I think I determined the solver and solution method to use, but I would like to confirm this with a more experienced user. So I'm doing a
-Transient simulation
-SAS model or LES model
-Acoustic FWH model on (source: injector, and 3 receivers spread arround the source (inside and outside the source surface)
-Using a density based explicit solver
-ROE-FDS flux
-CFL=1
-How can I determine the timestep and the number of timesteps?
-I used the BCs used for the aerodynamic simulation

Thank you very much in advance for your replies.

Good day to all

Alae · June 14, 2013, 08:50

Anyone??? I really need help here!

Sam Engineer · June 16, 2013, 08:00

Hi
I think that this link can help u
http://cfdco.com/tutorial-modeling-a...ct-method-caa/

Alae · June 18, 2013, 03:39

Thank you for your answer, it's a good tutorial. However I still need an answer to my questions...

June 10, 2013, 06:17	Some questions concerning direct Aeroacoustical simulations using Fluent	#1
Alae New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	Hello everybody, I'm a beginner user of Fluent, and I have to perform some aeroacoustical calculations, so I would be very grateful if someone could help me. I'm studying jet noise produced by an in-duct hot (90 degrees Celsius) air injector. A mesh of the injector has already been done for aerodynamic calculations. And I want to use this model to do direct aeroacoustical calculations. 1) Is it ok to use the same mesh? 2) After a lot of research, I think I determined the solver and solution method to use, but I would like to confirm this with a more experienced user. So I'm doing a -Transient simulation -SAS model or LES model -Acoustic FWH model on (source: injector, and 3 receivers spread arround the source (inside and outside the source surface) -Using a density based explicit solver -ROE-FDS flux -CFL=1 -How can I determine the timestep and the number of timesteps? -I used the BCs used for the aerodynamic simulation Thank you very much in advance for your replies. Good day to all

June 16, 2013, 08:00		#3
Sam Engineer New Member Join Date: Jun 2013 Posts: 6 Rep Power: 13	Hi I think that this link can help u http://cfdco.com/tutorial-modeling-a...ct-method-caa/ __________________ --------------------------- Useful Website in CFD -----------------------

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June 14, 2013, 08:50		#2
Alae New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	Anyone??? I really need help here!

June 18, 2013, 03:39		#4
Alae New Member Join Date: Jun 2013 Posts: 3 Rep Power: 13	Thank you for your answer, it's a good tutorial. However I still need an answer to my questions...