Prediction of shock-induced cavitation in water

18th APS-SCCM; 24th AIRAPT

Brundage, A.^1

Sandia National Laboratories, Integrated Military Systems Development Center, PO Box 5800, Albuquerque

NM

87185, United States^1

关键词: Biological applications;    Fluid-structure interaction problem;    Local pressure drop;    Pressure and temperature;    Simulated response;    Small cavities;    Traumatic Brain Injuries;    Ultrasonic pressure;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/500/10/102002/pdf
DOI  :  10.1088/1742-6596/500/10/102002

来源: IOP

【 摘 要 】

Fluid-structure interaction problems that require estimating the response of thin structures within fluids to shock loading have wide applicability. For example, these problems may include underwater explosions and the dynamic response of ships and submarines; and biological applications such as Traumatic Brain Injury (TBI) and wound ballistics. In all of these applications the process of cavitation, where small cavities with dissolved gases or vapor are formed as the local pressure drops below the vapor pressure due to shock hydrodynamics, can cause significant damage to the surrounding thin structures or membranes if these bubbles collapse, generating additional shock loading. Hence, a two-phase equation of state (EOS) with three distinct regions of compression, expansion, and tension was developed to model shock-induced cavitation. This EOS was evaluated by comparing data from pressure and temperature shock Hugoniot measurements for water up to 400 kbar, and data from ultrasonic pressure measurements in tension to -0.3 kbar, to simulated responses from CTH, an Eulerian, finite volume shock code. The new EOS model showed significant improvement over preexisting CTH models such as the SESAME EOS for capturing cavitation.