Two-way coupled compressible euler-lagrangian simulation to investigate cavitation and bubbly shock propagation
Abstract/Contents
- Abstract
- Cavitation is one of the most significant performance limiting phenomena encountered in liquid handling machinery and marine propulsion systems. Control of cavitation plays a critical role in the design of such systems. Ineffective control of cavitation can result in a significant erosive damage to marine propellers, decreased efficiency, unexpected noise/vibration and limited thrust of propulsion systems. This study aims at physics-based modeling of inter-phase phenomena encountered in cavitating flows to develop a compressible Eulerian-Lagrangian (E-L) framework for cavitating and non-cavitating bubbly flows. A fine-resolution DNS was performed to investigate wall reflection of bubbly pressure wave and to model bubble-bubble interaction from Rayleigh-Plesset equation. The amplification of pressure at wall is a function of bubble size, magnitude of incident pressure wave and surface tension. It does not depend on void fraction, which implies that even the presence of small bubbles near a wall in two-phase flows with low void fraction can cause damage to wall surface. A two-way coupled compressible E-L framework has been developed. Such methodology for predicting micro-dynamics of bubbles in bubbly shock problem worked very well to match FT-DNS result, which is a fine resolution DNS that tracks/resolves interface between two phases. Even with small number of bubbles in a 2-D geometry fundamental cavitation phenomena such as formation/detachment of sheet cavity due to re-entrant jet and development into cloud cavity could be observed. Bubble-bubble interaction is crucial for compressible E-L framework in terms of stability and accuracy, particularly for cavitating flows with high number density of bubbles. A bubble-bubble interaction model is specially designed for kernel interpolation based E-L solvers and Kubota's BBI model.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Lee, Jin-Wook |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Jin Wook Lee. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Engineering)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Jin-Wook Lee
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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