Understanding Nonlinear Coherent Structure Interactions in Boundary-Layer Transition using Adaptive Signal Analysis
Abstract
In an effort to understand the fundamental source and sustainment mechanisms of a turbulent boundary layer, the evolution of energy spectra within a transitional boundary layer are studied. To conduct this program, an adaptive modal decomposition technique, the multi-variate, multidimensional empirical mode decomposition, was developed. This approach permitted velocity fields of interest to be separated into modal components as defined by an adaptive, empirical basis. In addition to this method, a Riesz transform and log-Gabor filter method were introduced to isolate key flow scales of interest and characterize wavenumber component projections of multi-dimensional velocity fields. Experimental data of controlled H-type transition were acquired in a refractive index matched flume, and a POD analysis was conducted to obtain an initial understanding of the energetic flow structures associated with the transition process.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 19, 2021
- Accession Number
- AD1202747
Entities
People
- Phillip J. Ansell
Organizations
- University of Illinois Urbana–Champaign