Vortex sound in the presence of a low Mach number flow across a drum-like silencer

2011 ◽  
Vol 129 (5) ◽  
pp. 2830-2840 ◽  
Author(s):  
S. K. Tang
Keyword(s):  
Mach Number ◽  
Low Mach Number ◽  
Vortex Sound ◽  
Number Flow ◽  
Low Mach Number Flow

On vortex sound at low Mach number

1978 ◽  
Vol 85 (4) ◽  
pp. 685-691 ◽  
Author(s):  
W. Möhring
Keyword(s):  
Mach Number ◽  
Sound Source ◽  
Vortex Rings ◽  
Spherically Symmetric ◽  
Correlation Tensor ◽  
Low Mach Number ◽  
Vortex Sound ◽  
Flow Vorticity ◽  
Number Flow ◽  
Low Mach Number Flow

A transformation is described which relates the sound generated by low Mach number flow to the flow vorticity. For compact flow fields the apparent sound source is of quadrupole type and linear in the vorticity and therefore also linear in the flow velocity. This scheme is applied to the sound generated by the interaction of two identical thin vortex rings. Then a flow field with a number of compact vortices is discussed. It is found that each vortex can be replaced acoustically by a dipole related to the impulse of the vortex, plus the quadrupole just mentioned plus a spherically symmetric sound source related to the energy of the vortex. An application to low Mach number free-space turbulence shows that the generated sound is related to the vorticity correlation tensor.

Flux-vector splitting for compressible low mach number flow

1993 ◽  
Vol 22 (4-5) ◽  
pp. 441-451 ◽  
Author(s):  
Jörn Sesterhenn ◽  
Bernhard Müller ◽  
Hans Thomann
Keyword(s):  
Mach Number ◽  
Flux Vector ◽  
Low Mach Number ◽  
Flux Vector Splitting ◽  
Number Flow ◽  
Low Mach Number Flow

scholarly journals Active acoustic cloaking of cylindrical shells in low Mach number flow

2020 ◽  
Vol 479 ◽  
pp. 115400
Author(s):  
Briscoe Kerferd ◽  
Daniel Eggler ◽  
Mahmoud Karimi ◽  
Nicole Kessissoglou
Keyword(s):  
Mach Number ◽  
Cylindrical Shells ◽  
Low Mach Number ◽  
Number Flow ◽  
Low Mach Number Flow
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