libAcoustic for openFoam tutorial case (monopole-3D)

zeinelserfy · April 8, 2020, 12:33

I was checking libAcoustic tool for using it for noise prediction and i run one of its tutorials (monopole-3D)

http://github.com/unicfdlab/libAcous...als/monopole3D

I want to ask you some questions about the library for one of the tutorial cases (monopole-3D)

1- one of the variables in the fwhCommanSettings is dRef which is defined as domain wide for 2-D case, while in 3-D case it is set 1(monopole-3D)?and what does it mean?

2-Delay response time in fwhControl, why it is set to 10e-3

3-one of the functions include in controlDict is sphereAverage, i do not see any output files for that function?why is it added to controlDict

4-soundPressureSampling is used for creating firstly output Geometry format files in SurfaceGeometryData and then pressure sampling are created in pressureData in txt format,so how this text file is visualized

5-what is the aim of creating complexPressureData?

guanjiang.chen · March 14, 2021, 07:57

Hi,

Have you unterstanded this tutotrial?

Some of my thinking is:
1.the dRef should be set as -1 for a 3D case
how to use acoustic lib in openfoam
2.This depends on the distance between the noise source and control surface I think.
3.I delete this file, and it seems to have no influence on the results.
4.soundPressureSampling maybe is used for other sound prediction methods such as bem. The acoustic data is saved in acousticData.

Regards,
Guanjiang

April 8, 2020, 12:33	libAcoustic for openFoam tutorial case (monopole-3D)	#1
zeinelserfy New Member zein elserfy Join Date: May 2018 Posts: 25 Rep Power: 8	I was checking libAcoustic tool for using it for noise prediction and i run one of its tutorials (monopole-3D) http://github.com/unicfdlab/libAcous...als/monopole3D I want to ask you some questions about the library for one of the tutorial cases (monopole-3D) 1- one of the variables in the fwhCommanSettings is dRef which is defined as domain wide for 2-D case, while in 3-D case it is set 1(monopole-3D)?and what does it mean? 2-Delay response time in fwhControl, why it is set to 10e-3 3-one of the functions include in controlDict is sphereAverage, i do not see any output files for that function?why is it added to controlDict 4-soundPressureSampling is used for creating firstly output Geometry format files in SurfaceGeometryData and then pressure sampling are created in pressureData in txt format,so how this text file is visualized 5-what is the aim of creating complexPressureData?

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March 14, 2021, 07:57		#2
guanjiang.chen Member Guanjiang Chen Join Date: Apr 2020 Location: Bristol, United Kingdom Posts: 54 Rep Power: 6	Hi, Have you unterstanded this tutotrial? Some of my thinking is: 1.the dRef should be set as -1 for a 3D case how to use acoustic lib in openfoam 2.This depends on the distance between the noise source and control surface I think. 3.I delete this file, and it seems to have no influence on the results. 4.soundPressureSampling maybe is used for other sound prediction methods such as bem. The acoustic data is saved in acousticData. Regards, Guanjiang