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Hydrodynamic Simulations of Ejecta P...

Karkhanis, Varad Abhimanyu.

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Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces./
Author:	Karkhanis, Varad Abhimanyu.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
Description:	108 p.
Notes:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
Subject:	Mechanical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10607383
ISBN:	9780355132878

Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces.
Karkhanis, Varad Abhimanyu.

Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 108 p.

Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.

Thesis (Ph.D.)--The University of North Carolina at Charlotte, 2017.

The phenomenon of mass ejection into vacuum from a shocked metallic free surfaces can have a deleterious effect on the implosion phase of the Inertial Confinement Fusion (ICF) process. Often, the ejecta take the form of a cloud of particles that are the result of microjetting sourced from imperfections on the metallic free surface. Significant progress has been achieved in the understanding of ejecta dynamics by treating the process as a limiting case of the baroclinically-driven Richtmyer-Meshkov Instability (RMI). This conceptual picture is complicated by several practical considerations including breakup of spikes due to surface tension and yield strength of the metal. Thus, the problem involves a wide range of physical phenomena, occurring often under extreme conditions of material behavior.

ISBN: 9780355132878Subjects--Topical Terms:

649730
Mechanical engineering.

Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces.
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100 1 $a Karkhanis, Varad Abhimanyu. $3 3348369
245 1 0 $a Hydrodynamic Simulations of Ejecta Production From Shocked Metallic Surfaces.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2017
300 $a 108 p.
500 $a Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
500 $a Adviser: Praveen Ramaprabhu.
502 $a Thesis (Ph.D.)--The University of North Carolina at Charlotte, 2017.
520 $a The phenomenon of mass ejection into vacuum from a shocked metallic free surfaces can have a deleterious effect on the implosion phase of the Inertial Confinement Fusion (ICF) process. Often, the ejecta take the form of a cloud of particles that are the result of microjetting sourced from imperfections on the metallic free surface. Significant progress has been achieved in the understanding of ejecta dynamics by treating the process as a limiting case of the baroclinically-driven Richtmyer-Meshkov Instability (RMI). This conceptual picture is complicated by several practical considerations including breakup of spikes due to surface tension and yield strength of the metal. Thus, the problem involves a wide range of physical phenomena, occurring often under extreme conditions of material behavior.
520 $a We describe an approach in which continuum simulations using ideal gases can be used to capture key aspects of ejecta growth associated with the RMI. The approach exploits the analogy between the Rankine-Hugoniot jump conditions for ideal gases and the linear relationship between the shock velocity and particle velocity governing shocked metals. Such simulations with Upsilon-law fluids have been successful in accurately predicting the velocity and mass of ejecta for different shapes, and in excellent agreement with experiments. We use the astrophysical FLASH code, developed at the University of Chicago to model this problem. Based on insights from our simulations, we suggest a modified expression for ejecta velocities that is valid for large initial perturbation amplitudes. The expression for velocities is extended to ejecta originating from cavities with any arbitrary shape. The simulations are also used to validate a recently proposed source model for ejecta that predicts the ejected mass per unit area for sinusoidal and non-standard shapes. Such simulations and theoretical models play an important role in the design of target experiment campaigns.
590 $a School code: 0694.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Aerospace engineering. $3 1002622
650 4 $a Mechanics. $3 525881
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710 2 $a The University of North Carolina at Charlotte. $b Mechanical Engineering. $3 1286885
773 0 $t Dissertation Abstracts International $g 79-01B(E).
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792 $a 2017
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10607383