Executive Summary
This thesis investigates the influence of shock-induced air bubble collapse during underwater explosive (UNDEX) events using numerical simulations. It models cavitation zones, comprised of air bubbles, and analyzes their effect on shockwave propagation and pressure distribution. Findings indicate that multiple small bubbles can lower overall pressure compared to a single large one, and pressure increases near bubbles can be minimized by distance.
Why It Matters
This document is crucial for defense analysts and naval engineers as it provides detailed insights into the physics of underwater explosions and their interaction with cavitation, directly impacting naval vessel design, survivability, and underwater weapon effectiveness. Understanding these dynamics is vital for developing countermeasures and improving structural integrity against UNDEX events.
Key Takeaways
- Cavitation zones, formed by air bubbles during UNDEX, significantly alter shockwave propagation and pressure.
- Simulations show that multiple small air bubbles can result in lower overall pressure compared to a single large bubble of similar area.
- Pressure increases near air bubbles due to shockwave interaction can be mitigated by increasing the distance from the bubble center.
- The study utilized DYSMAS modeling and simulation to analyze various bubble configurations and their effects on pressure-time histories.
- The research provides a foundation for understanding and potentially manipulating UNDEX effects for defensive or offensive naval applications.
Strategic Relevance
Understanding the mechanics of underwater explosions and the role of cavitation is strategically important for naval warfare, ship protection, and the development of advanced underwater munitions. This research contributes to improving the survivability of naval assets against torpedoes and mines, as well as optimizing the destructive potential of offensive underwater weapons by predicting and mitigating their effects.