The Linearized Perturbed Compressible Equations for Aeroacoustic Noise Prediction at Very Low Mach Numbers

2005 ◽  
Author(s):  
Jung Seo ◽  
Young Moon
Keyword(s):  
Noise Prediction ◽  
Aeroacoustic Noise ◽  
Mach Numbers

Perturbed Compressible Equations for Aeroacoustic Noise Prediction at Low Mach Numbers

AIAA Journal ◽  
2005 ◽  
Vol 43 (8) ◽  
pp. 1716-1724 ◽  
Author(s):  
Jung-Hee Seo ◽  
Young J. Moon
Keyword(s):  
Noise Prediction ◽  
Aeroacoustic Noise ◽  
Mach Numbers

Numerical Aeroacoustic Noise Prediction for Complex HVAC Systems

2018 ◽  
Author(s):  
Matthias Tautz ◽  
Manfred Kaltenbacher ◽  
Stefan Becker
Keyword(s):  
Hvac Systems ◽  
Noise Prediction ◽  
Aeroacoustic Noise

A Splitting Method for Aeroacoustic Noise Prediction of Low Mach Number Viscous Flows

2005 ◽  
Vol 4 (1-2) ◽  
pp. 21-36 ◽  
Author(s):  
Young J. Moon ◽  
J. H. Seo
Keyword(s):  
Reynolds Number ◽  
Mach Number ◽  
Computational Efficiency ◽  
Plate Thickness ◽  
Splitting Method ◽  
Viscous Flows ◽  
Noise Prediction ◽  
Acoustic Analogy ◽  
Low Mach Number ◽  
Aeroacoustic Noise

A set of perturbed compressible equations(PCE), based on a hydrodynamic/acoustic splitting method, is proposed for aeroacoustic noise prediction of low Mach number viscous flows. The present formulation corrects the deficiency of previous splitting methods that have no control over the coupling effects between the incompressible vorticity and the perturbed velocities. The validation test shows that the present PCE solution is in excellent agreement with those of direct acoustic numerical simulation(DaNS) and Curle's acoustic analogy for a laminar dipole tone from a 2D circular cylinder at Reynolds number based on the cylinder diameter, ReD=200 and free stream Mach number, M∞ = 0.3. Computational efficiency and accuracy requirements for PCE are also investigated for a vortex scattering noise from the trailing-edge of a thin plate at Reynolds number based on the plate thickness, Reh= 2000 and M∞ = 0.3. The test results indicate that the computational efficiency can be achieved with an acoustic grid at lower resolution, as long as the projection quality of the total derivative of the incompressible pressure, DP/Dt field is retained.

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