Pressure Variation Over a Solid Wavy Surface
Abstract
Surface pressure variations for turbulent flow over solid wavy surfaces with a wavelength of 2 inches were studied. Measurements were made over waves of two amplitudes, 0.0123 inches and 0.03125 inches. The water flow rate and viscosity were varied so that a range of dimensionless wave numbers (scaled with the friction velocity and the kinematic viscosity) of alpha (+) = 0.0011 to 0.020 were covered. Pressure profiles are described using a three harmonic fit. A linear response, for which only a single harmonic is needed, was observed for all alpha (+) for the small amplitude wave and for small alpha (+) for the large amplitude wave. Of particular interest is the large phase shift of the pressure profile observed with increasing alpha (+). These results are used to test the quasi-laminar model for flow over wavy surfaces, widely used to predict wave generation and drag on small amplitude waves. Keywords: Surface pressure; Turbulence; Wavy surfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1988
- Accession Number
- ADA201724
Entities
People
- David J. Countemanche
- Thomas J. Hanratty
Organizations
- University of Illinois Urbana–Champaign