Abstract
We conducted a detailed analysis on the experimental data of the traveling wave control for zero pressure gradient turbulent boundary layer flow in which the drag reduction rate resulted in 7%. The free stream velocity is 2.0 m/s and Reynolds number based on the momentum thickness of the measurement section is 640 - 900 and the frictional Reynolds number is 300 - 340. It was confirmed that the traveling wave parameters; amplitude, wavelength, and wave speed are the same as that of the previous experiment conducted in the channel flow. We calculate laminar, turbulent Reynold shear stress (RSS), and periodic component in the same period with the control of FIK identity to analyze the contribution of local friction coefficient dividedly. As a result, the contribution of the turbulent component to the friction coefficient was decreased by the control while the periodic component was increased. Although the mean convection term was not directory calculated, the fact that the displacement thickness was thickened by the control suggests that this term was modified by the control to reduce skin friction. However, contributions of the RSS for the friction coefficient might be overestimated because some regions with the strong negative RSS which had been found in the previous DNS could not be measured.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
More From: The Proceedings of the Fluids engineering conference
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.