Sound Generation from Fluid Flow

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Discussion Overview

The discussion centers around the generation of sound from fluid flow through micro annuli, particularly focusing on the mechanisms involved in sound production from turbulent flow. Participants are exploring the fundamental principles of acoustics related to fluid dynamics, with specific attention to modeling scenarios involving both incompressible liquids and compressible gases.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that turbulence generates sound through vortex shedding and micro vortices, which create pressure fluctuations in the fluid.
  • Another participant questions whether the fluid is incompressible or compressible and whether it is pure or contains lumps that could affect flow rate.
  • A later reply clarifies that the modeling will include both an incompressible liquid (oil) and a compressible gas, indicating a scenario with overpressure allowing fluid migration through the micro annulus.
  • Additional references to literature on fluid-structure interactions and acoustics are provided to support the discussion.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the specific mechanisms of sound generation and the characteristics of the fluid being modeled. Multiple viewpoints regarding the nature of the fluid and its impact on sound generation remain present, indicating that the discussion is unresolved.

Contextual Notes

Participants have not fully defined the assumptions regarding fluid properties and flow conditions, which may affect the modeling outcomes. There is also a lack of consensus on the precise mechanisms of sound generation from turbulent flow.

klippen88
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Hi guys,

I am involved in some research on modelling sound from fluids through mirco annuli and i have been trying to get some of the basic fundamentals on generation of sounds from turbulent flow. Unfortunately most of the online literature do not give much details on the physics of such mechanism.

I hope you guys could provide me with some principels:

From my understanding, turbulence generate sound due to vortex shedding and micro vortices which generates pressure fluctuation within the fluid (i am not sure if this is correct) - these will transmittet through the structure and be recorded by the reciver on the other side of the annuli. (my model is a cement cylindre with a mirco annuli in the centre, where we throttle fluid across the cylindre - receiver is placed on the outside of the cylindre in liquid)

However, our case is to modelling the noise which is generated as the fluid is accelerated through the micro annuli.Thank you all so much for you help!
 
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Is the fluid an incompressible liquid, or a compressible gas?
Is the fluid pure, or are there lumps in the fluid that will change the flow rate?

Fluid-Structure Interactions In Acoustics -1999- Edited By Dominique Habault. Springer-Verlag Wein.

Oscillations and Waves in Linear and Nonlinear Systems -2012- MI Rabinovich, DI Trubetskov. Kluwer Academic Publishers.
 
Last edited:
Baluncore said:
Is the fluid an incompressible liquid, or a compressible gas?
Is the fluid pure, or are there lumps in the fluid that will change the flow rate?
I am sorry for not stressing this issue in my previous thread!

Both! I.e., I will model a case with incompressible liquid (oil) and one case with compressible fluid (gas).

Pure fluid with an decrease in the "leak" rate, in this manner you could considere the system as a system with overpressure which is bleed of to allow migration of the fluid through the micro annulus.

Hope this helps!
 
OK. See also; Acoustics of Fluid-Structure Interactions -1998- MS Howe, Cambridge Monographs on Mechanics, ISBN 0521633206, 9780521633208
 
Thank you! :-)
 

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