The Sound Field in Fully Developed Turbulent Pipe Flow Due to Internal Flow Separation, Part I: Wall-Pressure Fluctuations

1994 ◽  
Vol 169 (1) ◽  
pp. 89-109 ◽  
Author(s):  
N.K. Agarwal
Keyword(s):  
Flow Separation ◽  
Pipe Flow ◽  
Pressure Fluctuations ◽  
Sound Field ◽  
Internal Flow ◽  
Wall Pressure ◽  
Turbulent Pipe Flow ◽  
Wall Pressure Fluctuations

Wall-pressure fluctuations in turbulent pipe flow

1987 ◽  
Vol 30 (10) ◽  
pp. 3019 ◽  
Author(s):  
Gerald C. Lauchle ◽  
Mark A. Daniels
Keyword(s):  
Pipe Flow ◽  
Pressure Fluctuations ◽  
Wall Pressure ◽  
Turbulent Pipe Flow ◽  
Wall Pressure Fluctuations

Noise Filtering for Wall-Pressure Fluctuations in Measurements Around a Cylinder With Laminar and Turbulent Flow Separation

2016 ◽  
Vol 138 (6) ◽  
Author(s):  
C. Sardu ◽  
D. Lasagna ◽  
G. Iuso
Keyword(s):  
Turbulent Flow ◽  
Flow Separation ◽  
Adaptive Filters ◽  
Fluid Dynamic ◽  
Pressure Fluctuations ◽  
Free Field ◽  
Noise Cancellation ◽  
Wall Pressure ◽  
Wall Pressure Fluctuations ◽  
Laminar And Turbulent Flow

This paper proposes two different noise cancellation techniques for cleaning wall-pressure fluctuations signals. These fluctuations are measured around a circular cylinder with laminar and turbulent flow separation. The noise cancellation techniques are based on Wiener and adaptive filters and use the signals of pressure transducers mounted in a cross section of the cylinder and the signal of a free-field sensor opportunely located upstream. First, synthetic signals are used in order to validate the procedure. Then, both techniques are applied to the experimental data. Specific attention is paid to the filter order, optimized by a method introduced in this paper. Both filter types showed a selective behavior preserving the essence of the fluid dynamic phenomena characterizing the flow fields at each Reynolds number tested, especially when laminar separation occurs.

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