Physical and Computational Investigation of the Wall Pressure Fluctuations ina Channel Flow.
Abstract
Wall pressure fluctuations within an equilibrium rectangular channel flow geometry were investigated. The overall objective of this investigation was to obtain experimentally for the first time, the statistical properties of the 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 means and fluctuations components of the streamwise velocity were obtained at a number of 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 utilized 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. Keywords: Noise cancellation; Wall pressure; Direct numerical simulation; Turbulent flow; Hydrodynamic flow noise. (JHD)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 26, 1990
- Accession Number
- ADA221358
Entities
People
- Michael P. Horne
Organizations
- United States Naval Research Laboratory