2026-09-21T19:45:59Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/125521 2025-02-06 col_2142_5131 col_2142_14787 com_2142_5130 com_2142_9630 com_2142_234

application/pdf en text Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms The student, Songyuan Cui, accepted the attached license on 2024-06-14 at 20:02. The student, Songyuan Cui, submitted this Thesis for approval on 2024-06-15 at 09:17. This Thesis was approved for publication on 2024-06-18 at 11:38. DSpace SAF Submission Ingestion Package generated from Vireo submission #20839 on 2025-02-04 at 21:03:29 Fluid-structure Interactions Soft-body Dynamics eng Viscous streaming in the vicinity of three-dimensional elastic structures Cui, Songyuan 2024-06-18 Gazzola, Mattia Viscous Streaming Viscous streaming, also termed steady streaming or classically acoustic streaming, is a secondary inertial effect that arises when viscous fluids oscillate around an immersed object. It is an efficient rectification mechanism that exploits the steady flow emerging out of the oscillatory base flow and has found extensive applications in microfluidics and particle manipulation. Classical investigations focus on the structure of streaming flows in the vicinity of rigid bodies, leading to a robust theoretical framework based primarily on asymptotic approximations. Recent studies, motivated by its biological implications, have ventured beyond rigid body streaming and theoretically elucidated the impact of body elasticity on streaming flows in two dimensions. In this study, we generalize those findings to three dimensions, via a minimal case study of an immersed soft sphere. We first consider the streaming solution in the rigid sphere limit, where we improve upon an existing solution by considering previously unaccounted terms. We then enable body compliance, exposing a three-dimensional, elastic streaming process available even in Stokes flows. Such effect, consistent with two-dimensional analyses but analytically distinct, is validated against direct numerical simulations and shown to translate to bodies of complex three-dimensional geometry and topology, paving the way for advanced forms of flow control. 2024-08 Thesis https://hdl.handle.net/2142/125521 Copyright 2024 Songyuan Cui Mechanical Sci & Engineering Mechanical Engineering University of Illinois at Urbana-Champaign M.S. Thesis