Discrete multi physic model for the Rayleigh collapse of a single cavity

Albano, Andrea ORCID: 0000-0003-0998-1039 (2021). Discrete multi physic model for the Rayleigh collapse of a single cavity. University of Birmingham. Ph.D.

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In this thesis, a Discrete Multi-Physics model based on Smoothed Particle Hydrodynamics is developed to simulate a Rayleigh collapse of a single bubble. All the simulations were run on a modified version of the open source software LAMMPS and visualised on OVITO. Initially a 2D model is validated by simulating a phenomenon that shares many similarities with a collapse mechanism, the interaction of a shock wave with a discrete gas inhomogeneity, showing similar performance to classic mesh based CFD. The model is then used to simulate a 2D Rayleigh collapse and validated against the 2D Rayleigh-Plesset equation for both empty and gas filled cavity. The validated model is used to investigate the role of heat diffusion at the gas-liquid interface of the cavity, and to study non-symmetrical collapse induced by the presence of a nearby surface. Enabling heat diffusion at the gas-liquid interface allowed to identify five different possible behaviours that range from isothermal to adiabatic, while the results of non symmetric collapse show that the surface is hit by a stronger shock when distance between the center of the cavity and the surface is zero while showing more complex double peaks behaviour for other distances. In the final chapter a 3D model is used to model an attached non-symmetrical collapse and its hydrodynamic is compared with the equivalent 2D case.

Type of Work: Thesis (Doctorates > Ph.D.)
Award Type: Doctorates > Ph.D.
Alexiadis, AlessioUNSPECIFIEDorcid.org/0000-0001-9240-3517
Alberini, FedericoUNSPECIFIEDorcid.org/0000-0001-8479-6330
Licence: All rights reserved
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Chemical Engineering
Funders: Other
Other Funders: US Office of Naval Research Global (ONRG)
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
T Technology > T Technology (General)
URI: http://etheses.bham.ac.uk/id/eprint/11999


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