Multi-Modal Interactions in Three-Dimensional Unsteady Flows
Abstract
The ability to control fluid flow behaviors can lead to quiet, economical, and efficient systems in fluid mechanics and aerodynamics. Because of high dimensionality, strong nonlinearity, and complexity in fluid physics, the primary challenge to designing effective control strategies comes from the lack of understanding of fundamental mechanisms in complex three-dimensional flow and multi-flow-phenomenon interactions. This project aims to unravel the temporal and spatial interactions of perturbations in the form of modes by developing a three-dimensional harmonic resolvent analysis applied to boundary-layer separated flow. A micro-cavity is implemented before the flow separation over a flat plate; the cavity s self-sustained oscillation generates vortices that convect downstream and interact with the separated flow. With the control objective of eliminating flow separation through the interaction, the harmonic resolvent formulation will model the temporal and spatial interactions between these two canonical flow phenomena. Temporal interaction will be revealed through modeling coupling of perturbation with different frequencies; spatial interaction will be uncovered by investigating the alternative role of forcing and flow response in the resolvent formulation. With the physical insights discovered from the multi-modal interactions, high-fidelity simulations will be performed to further elucidate the control mechanism and identify an optimal control strategy in nonlinear flows. The tool and framework developed in this project can be generally applied to various complex three-dimensional compressible flows, which will advance the research capabilities to tackle multi-flow-phenomenon interactions for practical engineering applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2025
- Source ID
- FA95502410136
Entities
People
- Yiyang Sun
Organizations
- Air Force Office of Scientific Research
- Syracuse University
- United States Air Force