Bulletin of the American Physical Society
77th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 24–26, 2024; Salt Lake City, Utah
Session R33: Drag Reduction III: Textured Surfaces
1:50 PM–3:47 PM,
Monday, November 25, 2024
Room: 255 E
Chair: Yaqing Jin, The University of Texas at Dallas
Abstract: R33.00003 : Downstream passive flow control by phononic subsurfaces
2:16 PM–2:29 PM
Presenter:
Mahmoud I Hussein
(University of Colorado, Boulder)
Authors:
Mahmoud I Hussein
(University of Colorado, Boulder)
David Roca
(Universitat Politècnica de Catalunya)
Adam R Harris
(University of Colorado Boulder)
Armin Kianfar
(University of Colorado Boulder)
In previous research, we have shown that wave motion underneath a surface interacting with a flow may be tuned to cause the flow to stabilize, or destabilize, as desired [Hussein et al., Proc. R. Soc. A, 2015]. The underlying control mechanism utilizes core concepts from phonon physics, primarily, the principle of destructive or constructive interferences and the notion of symmetry breaking. This is realized by installing a “phononic subsurface” (PSub), which is an engineered structure placed in the subsurface region and configured such that its edge is exposed to the flow, forming an elastic fluid-structure interface. The PSub may take the form of a phononic crystal or an elastic metamaterial, with finite extent, and is typically (but not necessarily) oriented perpendicular to the fluid-structure interface. It is designed to exhibit specific frequency-dependent amplitude and phase response characteristics at the edge exposed to the flow. We will present results demonstrating the ability of a configuration of metamaterial-based PSubs to cause flow stabilization, or destabilization if desired, not only near the region of installation but also downstream of this region. These results provide a key advancement of the emerging paradigm of PSubs for passive flow control.
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