MEchanics GAthering -MEGA- Seminar: Cavity Flow and the Boundary Layer Effect
Event details
| Date | 29.08.2024 |
| Hour | 16:15 › 17:15 |
| Speaker | Caroline Hamilton Smith (University of Sidney) |
| Location | Online |
| Category | Conferences - Seminars |
| Event Language | English |
Abstract: Cavity flow produces a notable deficit in the performance of ships, cars, aircraft and submarines alike, owing to the presence of complex and unsteady turbulence, drag, acoustics, vibration and structural fatigue. The flow is a building block of fluid dynamics, due to a long list of abundant principal flows; vorticity, shear layer oscillation, feedback..., from which progressive understanding has fed into contemporary advancement in fluid dynamics as a whole. This research documents hot-wire and unsteady surface pressure experiments executed on a range of cavity geometries, focusing on how altering upstream geometry and thus boundary layer structure impacts internal surface pressures, and their contribution to fluid response. The key finding highlights the drastic impact of measured and similar boundary layer structures on the cavity response, assessed using DMD. A thin accelerated boundary layer separated dominant eigenvalues within the eigen circle, with normalised eigenvectors of discrete modal magnitude. A thick flat-plate boundary layer instead clumped eigenvalues, with a lack of discrete mode structures, shifted in phase and significantly reduced in magnitude. Overall, changes in boundary layer structure, not only thickness, but momentum as a function of upstream pressure gradients, completely warped the mode shapes. Therefore, boundary layer structures as a function of external geometry design, provides constructive ability to control, and thus predict modes in the spectra, their dominance and normalised eigenvector magnitudes with respect to known cavity geometry.
Bio: Graduated First Class Honors Bachelor of Aeronautical (Space) Engineering from the University of Sydney 2015-2019, with an Unsteady Low-Speed Cavity Flow Aerodynamics Thesis. Interned with Airbus Flight Physics in Bristol, UK 2017/18, as a part of the Aerodynamics Performance department, working on Lift and Drag performance during flight test, to improve empirical and numerical models of the Airbus Fleet Structural Engineering Graduate with Airbus Australia Pacific 2020/2021, primarily in-service repairs, and upgrade modifications, including Sat-Com KA-band installation on the C-130J Fleet for RAAF. Commenced a PhD at the University of Sydney end of 2021, to pursue my love of Aerodynamics, in the Unsteady Fluid Dynamics of Cavity Flow focusing on the Boundary Layer Effect. I have received several Awards to support my research inclusive to the Amelia Earhart Fellowship, Faculty Engineering Scholarship, and Defence Materials Technology Support Scholarship. Published in the European Journal of Mechanics B/Fluids on the History of Cavity Flow recently, and at present developing a Similarity Cavity Flow Solution article to be published in JFM.
Bio: Graduated First Class Honors Bachelor of Aeronautical (Space) Engineering from the University of Sydney 2015-2019, with an Unsteady Low-Speed Cavity Flow Aerodynamics Thesis. Interned with Airbus Flight Physics in Bristol, UK 2017/18, as a part of the Aerodynamics Performance department, working on Lift and Drag performance during flight test, to improve empirical and numerical models of the Airbus Fleet Structural Engineering Graduate with Airbus Australia Pacific 2020/2021, primarily in-service repairs, and upgrade modifications, including Sat-Com KA-band installation on the C-130J Fleet for RAAF. Commenced a PhD at the University of Sydney end of 2021, to pursue my love of Aerodynamics, in the Unsteady Fluid Dynamics of Cavity Flow focusing on the Boundary Layer Effect. I have received several Awards to support my research inclusive to the Amelia Earhart Fellowship, Faculty Engineering Scholarship, and Defence Materials Technology Support Scholarship. Published in the European Journal of Mechanics B/Fluids on the History of Cavity Flow recently, and at present developing a Similarity Cavity Flow Solution article to be published in JFM.
Practical information
- General public
- Free
Organizer
- MEGA.Seminar Organizing Committee