Scholars@Duke
Obed Isaac

Selected Publications

Ejecta-Modulated Bubble Dynamics Play a Dominant Role in Stone Retropulsion.

Journal Article Advanced science (Weinheim, Baden-Wurttemberg, Germany) · April 2026 Cavitation bubbles generated by laser absorption in liquids collapse violently, producing high-speed jets, toroidal bubbles, and shock waves that induce material erosion and object displacement. In laser lithotripsy, this phenomenon causes kidney stone mig ... Full text Cite

Numerical modelling of blast mitigation of pre-fractal obstacles

Journal Article International Journal of Protective Structures · September 1, 2024 The mechanics of downstream blast wave attenuation caused by interaction with obstacles arranged into a pre-fractal shape based on the Sierpinski carpet was numerically investigated using a high-fidelity CFD solver. The blast mitigation was qualitatively a ... Full text Cite

Experimental investigation of blast mitigation of pre-fractal obstacles

Journal Article International Journal of Protective Structures · March 1, 2024 Obstacles arranged into a pre-fractal shape (Sierpinski carpet) were tested for their blast attenuation abilities using 250 g PE4 at three different scaled distances (Z = 1.87, 2.24, 2.99 m/kg1/3). Three pre-fractal iterations were tested, as we ... Full text Cite

Blast wave interaction with structures – An overview

Journal Article International Journal of Protective Structures · December 1, 2023 Blast–obstacle interaction is a complex, multi-faceted problem. Whilst engineering-level tools exist for predicting blast parameters (e.g. peak pressure, impulse and loading duration) in geometrically simple settings, a blast wave is fundamentally altered ... Full text Cite

Mitigation of blast loading through blast–obstacle interaction

Journal Article International Journal of Protective Structures · September 1, 2023 Obstructing the passage of blast waves is an effective method of mitigating blast pressures downstream of the obstacle. To this end, the interaction between a blast wave and a simplified structural shape, such as a cylinder, has been widely investigated to ... Full text Cite

Optical flow tracking velocimetry of near-field explosions

Journal Article Measurement Science and Technology · April 1, 2022 To better understand the complex dynamics and physics associated with the rapid expansion of the detonation product fireball following an explosion, it is imperative to have a full description of its associated velocity field. Typical experimental techniqu ... Full text Cite

Impulse Loading of Plates using a Diverging Shock Tube

Journal Article Experimental Mechanics · April 1, 2020 Impulsive blast loading studies typically require facilities with sub-millisecond decay time simulation capability. Using a conventional shock tube for such studies, however, is not viable due to a finite shock formation distance that limits the size of th ... Full text Cite