Physical and Computational Investigation of the Wall Pressure Fluctuations in a Channel Flow
Abstract
The overall objective of this investigation was to obtain experimentally the statistical properties of wall pressure fluctuations for a generic turbulent flow within a rectangular channel and to directly compare the results with those obtained from a full solution to the Navier-Stokes equations via Direct Numerical Simulation (DNS). For both the physical and computational experiments, serious limitations on the quality of the results were identified related to facility generated noise, transducer resolution, Reynolds number effects and constraints imposed by the computational technique. An extensive data base was obtained from the physical experiment. Profiles for the mean and fluctuation components of the streamwise velocity were obtained at several spanwise locations and served to establish the existence of equilibrium flow conditions over a range of Reynolds numbers. An array of flush-mounted pressure transducers was used to measure the two point spectral characteristics in the stream-wise direction. A unique signal processing scheme was developed and used to cancel facility generated noise which resulted in new information being recorded at low frequencies for the Reynolds numbers investigated. Results from both experiments were compared directly. The computational results were found to be somewhat underdeveloped for the higher order statistics for the data investigated. Keywords: Noise cancellation; Turbulent flow; Hydrodynamic flow noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 26, 1990
- Accession Number
- ADA221287
Entities
People
- Michael P. Horne
Organizations
- United States Naval Research Laboratory