E.S. Hertel

A roadmap for the introduction of Vital Fluid natural nitrogen in the Spanish (organic) horticulture : a desk and field study

Nieves García Victoria, Esteban Baeza Romero, E.S. Hertel, M. van Boxtel et autres

Referaat Stikstof bemesting is een grote uitdaging in de biologische tuinbouw.Via plasmareactoren kan stikstof uit de lucht worden vastgelegd in water, een oplossing dat kan worden toegepast via het irrigatiesysteem.Spanje heeft de grootste gecertifi ceerde oppervlakte biologische teelt van Europa.Uit desk-en veldstudie …

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Characterizing In-Flight Temperature of Shaped Charge Penetrators in CTH

Peter A. Sable, Nathaniel S. Helminiak, Arne S. Gullerud, E. N. Harstad et autres

With the increasing use of hydrocodes in modelling and system design, benchmarking of software against experiments has become even more vital. While substantial work has been done in this regard, comparisons with temperature data within dynamic experiments are sparse due to experimental …

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Characterizing In-Flight Temperature of Explosively Formed Projectiles in CTH

Nathaniel S. Helminiak, Peter A. Sable, E. N. Harstad, Arne S. Gullerud et autres

Code validation against experimental data is vital in building confidence for the use of simulation software in modeling and system design. Temperature data is of particular interest in the study of hypervelocity impact, however the experimental measurement of temperature in such a …

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A reaction progress variable modeling approach for non-ideal multiphase explosives

Kevin Ruggirello, Paul E. DesJardin, Melvin R. Baer, Michael J. Kaneshige et autres

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Modeling of particle compressibility and ignition from shock focusing

Kevin Ruggirello, Paul E. DesJardin, Melvin R. Baer, E.S. Hertel

Two-phase shock-driven reacting flow simulations are conducted to determine the post-detonation shock-focusing ignition and burning of aluminum particle mixtures. A model for aluminum particles that accounts for material compressibility from shock heating and expansion is presented. The Lagrangian description of the particles …

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Modeling Enhanced Blast Explosives UsingA Multiphase Mixture Approach

Melvin R. Baer, Robert G. Schmitt, E.S. Hertel, Paul E. DesJardin

In this overview we present a reactive multiphase flow model to describe the physical processes associated with enhanced blast. This model is incorporated into CTH, a shock physics code, using a variant of the Baer and Nunziato nonequilibrium multiphase mixture to describe …

CTH Ver. FEB01

M R Baer, R. L. Bell, R. M. Brannon, D. A. Crawford et autres

Scalable computations in penetration mechanics

K.D. Kimsey, Stephen J. Schraml, E.S. Hertel

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Benchmarking the SPHINX and CTH shock physics codes for three problems in ballistics

L. T. Wilson, E.S. Hertel, L. A. Schwalbe, C.A. Wingate

The CTH Eulerian hydrocode, and the SPHINX smooth particle hydrodynamics (SPH) code were used to model a shock tube, two long rod penetrations into semi-infinite steel targets, and a long rod penetration into a spaced plate array. The results were then compared …

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The impact of tungsten long rod penetrators into water filled targets

L. T. Wilson, David L. Dickinson, E.S. Hertel

Twelve experiments were conducted to determine the effect of water filled targets on the penetration of tungsten long rods in terms of their residual mass and integrity. CTH hydrocode calculations were performed for each of the experiments to ensure that the erosion …

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A survey of numerical methods for shock physics applications

E.S. Hertel

Hydrocodes or more accurately, shock physics analysis packages, have been widely used in the US Department of Energy (DOE) laboratories and elsewhere around the world for over 30 years. Initial applications included weapons effects studies where the pressure levels were high enough …

ASCI Red -- Experiences and lessons learned with a massively parallel teraFLOP supercomputer

Christon, D. A. Crawford, E.S. Hertel, J.S. Peery et autres

The Accelerated Strategic Computing Initiative (ASCI) program involves Sandia, Los Alamos and Lawrence Livermore National Laboratories. At Sandia National Laboratories, ASCI applications include large deformation transient dynamics, shock propagation, electromechanics, and abnormal thermal environments. In order to resolve important physical phenomena in …