TODAY: Ankit Kumar, 14-Oct-25, 12:20pm Central
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Ellad Tadmor
Oct 14, 2025, 6:56:44 AM (6 days ago) Oct 14
to aem-solid...@umn.edu
AEM Mechanics Research Seminar
Tuesday 14-Oct-2025, 12:20pm Central
Mr. Ankit Kumar
Department of Aerospace Engineering and Mechanics, University of Minnesota
Title: Kinetics of impact induced cavitation in water: a Combined Theoretical and Experimental Study
Abstract: When liquids are exposed to rapid dynamic loading from explosions, impacts, or certain medical procedures, they can experience tensile stresses that drive them into metastable states. These stresses can trigger phase transformation from liquid to vapor, a phenomenon known as cavitation. While extensively studied in the quasistatic regime, the kinetics of cavitation under dynamic loading remains a fundamental challenge. In particular, classic models of fluids with phase change (i.e., models like the van der Waals gas) exhibit non-uniqueness of what are expected to be well-posed problems. Unlike ordinary shock waves, this issue is not resolved by including viscosity.
In this study, we develop a theoretical framework to solve the two-phase Riemann problem associated with the dynamics of phase interfaces during impact-induced cavitation. This formulation models the dynamic evolution of liquid-vapor interfaces under transient tensile stresses generated by impact loading. To experimentally validate this framework, we designed a modified liquid Hopkinson bar setup to generate controlled stress waves in a confined water column. Through the interaction of rarefaction waves, a disk-like region of large negative pressure is produced, enabling observation of cavitation phenomena in a quasi one-dimensional framework. High-speed diagnostics are employed to probe the nucleation and growth of this disk, providing insight into the kinetics of impact-induced phase transitions.
This combined theoretical and experimental approach establishes a foundation for quantifying the kinetics of cavitation under impact. Beyond fundamental interest, these findings have potential implications in diverse applications, from blast-induced traumatic brain injury to industrial processes where rapid pressure changes in confined fluids may induce phase transformation.
For more information, visit the AEM Mechanics Research Seminar website:
Tuesday 14-Oct-2025, 12:20pm Central
In-person: Room 313, Akerman Hall, University of Minnesota
Online: Webinar registration link
Department of Aerospace Engineering and Mechanics, University of Minnesota
Title: Kinetics of impact induced cavitation in water: a Combined Theoretical and Experimental Study
Abstract: When liquids are exposed to rapid dynamic loading from explosions, impacts, or certain medical procedures, they can experience tensile stresses that drive them into metastable states. These stresses can trigger phase transformation from liquid to vapor, a phenomenon known as cavitation. While extensively studied in the quasistatic regime, the kinetics of cavitation under dynamic loading remains a fundamental challenge. In particular, classic models of fluids with phase change (i.e., models like the van der Waals gas) exhibit non-uniqueness of what are expected to be well-posed problems. Unlike ordinary shock waves, this issue is not resolved by including viscosity.
In this study, we develop a theoretical framework to solve the two-phase Riemann problem associated with the dynamics of phase interfaces during impact-induced cavitation. This formulation models the dynamic evolution of liquid-vapor interfaces under transient tensile stresses generated by impact loading. To experimentally validate this framework, we designed a modified liquid Hopkinson bar setup to generate controlled stress waves in a confined water column. Through the interaction of rarefaction waves, a disk-like region of large negative pressure is produced, enabling observation of cavitation phenomena in a quasi one-dimensional framework. High-speed diagnostics are employed to probe the nucleation and growth of this disk, providing insight into the kinetics of impact-induced phase transitions.
This combined theoretical and experimental approach establishes a foundation for quantifying the kinetics of cavitation under impact. Beyond fundamental interest, these findings have potential implications in diverse applications, from blast-induced traumatic brain injury to industrial processes where rapid pressure changes in confined fluids may induce phase transformation.
For more information, visit the AEM Mechanics Research Seminar website:
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Ellad B. Tadmor, Ph.D.
Russell J. Penrose Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
https://dept.aem.umn.edu/~tadmor/
Russell J. Penrose Professor
Department of Aerospace Engineering and Mechanics
University of Minnesota
https://dept.aem.umn.edu/~tadmor/
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