Impact of External, Wall, and Pressure-Gradient Conditions on Overlap Region Parameters in High Reynolds Number Boundary Layers
Abstract
In Part I of our work, mean velocity distributions in the overlap region, over the range of Reynolds, numbers 10,000 <Re(theta) < 70,000, under five different pressure-gradient conditions are accurately described by a log law. The pressure-gradient conditions include adverse, zero, favorable, strongly favorable, and a complex condition. Parameters of the logarithmic overlap region developed from these higher Reynolds number boundary layers remain independent of Reynolds number when the boundary layers are under equilibrium conditions. The best estimate of the log-law parameters from the zero-pressure gradient boundary layers is k =0.37, B = 4.0. In Part II of our work a three-dimensional turbulent boundary layer over a flat plate is carefully documented with SPIV. At the first measurement station, the boundary layer is nearly two-dimensional before the secondary flow is generated via removal of mass through the side wall of the test section. The measurements are contrasted with Computations made using the commercial code by FLUENT.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 09, 2004
- Accession Number
- ADA421021
Entities
People
- Hassan M. Nagib
Organizations
- Illinois Institute of Technology