Computational Analysis of Rotor Acoustic Response to Transient Turbulent Inflow
Abstract
We propose a numerical investigation aimed at understanding and predicting rotoracoustic response to transient, complex turbulent i"nflows resulting from upstream controlsurface movement. This is the computational component of a collaborative effort being pro-posed that includes parallel experimental investigations by William Devenport and NathanAlexander at Virginia Tech and analytical mod"eling by Stewart Glegg at Florida AtlanticUniversity. Through a set of carefully designed configurations, key physical effects incl""udingthe coupling between the rotor and the control surface, the time scale of control-surface ac-tuation, and the presence of a t""hick hub boundary layer, will be investigated systematically.The computational approach is based on large-eddy simulation using an"" unstructured-mesh,finite-volume code in combination with the Ffowcs Williams-Hawkings equation, and willbe enhanced with capabili"ties to handle moving surfaces and calculate the acoustic scatter-ing by control surfaces and the hub. Numerical simulation results" will be validated againstexperimental measurements and then used to elucidate the acoustic source mechanisms,evaluate the accurac""y of noise prediction models under transient inflow conditions, andprovide detailed input for development of improved models.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 07, 2017
- Source ID
- N000141712686
Entities
People
- Meng Wang
Organizations
- Office of Naval Research
- United States Navy
- University of Notre Dame