Wall Turbulence with Designer Properties: Identification, Characterization and Manipulation of Energy Pathways
Abstract
The research performed under this BRI award targeted the identification, characterization and manipulation of energy pathways in wall turbulence. The objectives were pursued separately and collaboratively by the California Institute of Technology (Caltech), the University of Florida (UF) and the University of Texas at Austin (UT) teams through a joint numerical, experimental and modeling effort. Our approach applied the team's state-of-the-art capabilities in experiments (Caltech), simulation (UT), MEMS sensor development (UF) and linear algebra techniques (Caltech) to the resolvent formulation of the Navier-Stokes equations for wall turbulence proposed by McKeon and Sharma (2010). This formulation explicitly identifies the pathways for extraction of energy from the mean flow and transfer between wavenumbers, and thus can be used to identify forcing distributions required to manipulate the spectrum. Energetic pathways between modes have been identified, highlighted and characterized by experimentally exciting two modes and providing the first-known observation of a single triadic interaction.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 26, 2016
- Accession Number
- AD1005019
Entities
People
- Beverley McKeon
- David J. Goldstein
- Joel Tropp
- Mark Sheplak
Organizations
- California Institute of Technology