Low-order representation of roughness using resolvent analysis from idealized to real-world geometries
Abstract
Despite a large research effort in the area of turbulent flow over rough walls, there remains a lack of a formal connection between"" the geometric properties of roughness and the corresponding flow response. In previous work, we have investigated the behavior of f""low over idealized roughness consisting of a single harmonic wavelength in both wall-parallel directions, which isamenable to analy"tical investigation and modeling by extension of the input-output analysis of the Navier-Stokes equations for smooth wall turbulence" of McKeon & Sharma (2010). In the proposed work, we will develop the experiments and modeling approach to bridge the gap between th""is single mode representation and complex real-world roughness, quantifying theinteraction of individual modes with a view to ident""ifying the influence of specific interactions on the turbulence statistics and, especially, the mean flow properties. The effort wil"l include both experimental measurements over roughness of carefully-designed increasing complexity and identification of the interactions between wavenumbers associated with the roughness in theturbulence statistics.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 29, 2017
- Source ID
- N000141712960
Entities
People
- Beverley McKeon
Organizations
- California Institute of Technology
- Office of Naval Research
- United States Navy