The finite-element shock hydrodynamics code ALEGRA has recently been upgraded to include an X-FEM implementation in 2D for simulating impact, sliding, and release between materials in the Eulerian frame. For validation testing purposes, the problem of long-rod penetration in semi-infinite targets is considered in this report, at velocities of 500 to 3000 m/s. We describe testing simulations done using ALEGRA with and without the X-FEM capability, in order to verify its adequacy by showing X-FEM...

Topics: DTIC Archive, SANDIA NATIONAL LABS ALBUQUERQUE NM, *HYDRODYNAMIC CODES, FINITE ELEMENT ANALYSIS,...

The one-dimensional Lagrangian hydrodynamics computer program PUFF is described. The code is used primarily in the study of X-ray effects and uses finite difference methods to solve the equations of hydrodynamics using slab geometry and assuming 1-dimensional flow through a 1-centimeter-square pipe. The original PUFF was a derivative of a code of the Lawrence Radiation Laboratory (O. Nance, M. Wilkins, I. Blandord, and H. Smith, 'Sharp,' A one- dimensional hydrodynamics code for the IBM 704,'...

Topics: DTIC Archive, AIR FORCE WEAPONS LAB KIRTLAND AFB NM, *COMPUTER PROGRAMMING, HYDRODYNAMIC CODES, ONE...

A numerical experiment is described in which an attempt was made to reduce the calculation time for a two-dimensional, Lagrangian, hydrodynamics code, without loss of accuracy. The reduction was accomplished by utilizing a space-dependent time step; i.e., the frequency with which a point is calculated depends on the rate at which changes are occurring in the vicinity of the point. This system permitted savings to be made by eliminating calculations in regions undergoing relatively slow changes.

Topics: DTIC Archive, Browne, Phillip L, LOS ALAMOS NATIONAL LAB NM, *TWO DIMENSIONAL FLOW, HYDRODYNAMIC...

This document presents the advances made in three major areas during the 1980 theoretical program in support of the NRL Plasma Radiation group. This support has provided new directions in which to seek quantitative explanation of the wire array radiation pulse and advancements in numerical and computational methodologies. The areas treated in this report are: (1) improvements to the 1-D magneto-hydro-dynamics SPLAT code and development of scaling laws governing the radiative output using this...

Topics: DTIC Archive, Terry,Robert E, JAYCOR ALEXANDRIA VA, *PLASMAS(PHYSICS), MATHEMATICAL PREDICTION,...

Energetic implosions, using two or three load wires to create a focused axial stagnation of dense wire cores amidst the assembled precursor plasma, are examined with respect to the trade between the implosion mass lost to precursor ablation and the mass or kinetic energy available at stagnation. The calculated kinetic energy at stagnation serves as measure for the output x-radiation.

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC RADIATION HYDRODYNAMICS BRANCH, *KINETIC ENERGY,...

As part of ongoing hydrodynamic code validation efforts, a series of Near Term Liner Experiments (NTLX) was designed for the Shiva Star capacitor bank at the Air Force Research Laboratory (AFRL). A cylindrical aluminum liner that is magnetically imploded onto a central target by self-induced radial Lorentz forces drove the experiments. The behavior of the target was simulated using the adaptive mesh refinement (AMR) Eulerian hydrodynamics code RAGE in 2- and 3-D. One-dimensional simulations of...

Topics: DTIC Archive, LOS ALAMOS NATIONAL LAB NM, *HYDRODYNAMIC CODES, *PULSE GENERATORS, *VALIDATION,...

The objective of this work unit was to review and discuss the application of hydrodynamic codes in the Office of Civil Defense (OCD) shelter research program, and then consider the development of a conceptual model of the flow into and through blast-slanted basement shelters. The review selected a two-dimensional Eulerian code which numerically simulated inviscid, compressible flow without heat transfer. This form of code was shown to be the most suitable form of code for OCD needs on a...

Topics: DTIC Archive, Melichar, Joseph F, URS RESEARCH CO BURLINGAME CA, *CIVIL DEFENSE, *SHELTERS,...

The Atlas pulsed-power machine is a 23-megajoule capacitor bank that delivers 28 mega-amperes in a 5 microsecond rise-time pulse into a cylindrical imploding liner, which often contains a target. It is used to study the hydrodynamic behavior of various materials under well-controlled high-energy conditions. X-ray imaging or radiography is used to infer trajectories and velocities of the shockwave and the material interfaces in the target. The axial radiography diagnostic records four high-speed...

Topics: DTIC Archive, BECHTEL NEVADA INC LAS VEGAS NV, *RADIOGRAPHY, *SHOCK WAVES, HIGH ENERGY,...

The effects of flow blockage in a blast simulator were investigated and means sought to mitigate those effects. Flow characteristics were studied by two-dimensional hydrodynamic calculations for flared and vented test chambers as compared with straight tubes at similar blockage. Several conditions up to 30 psi blast overpressure and 30% blockage were investigated. It was shown that the diffraction phase of blast interaction was best reproduced in a straight tube in spite of blockage. Flared and...

Topics: DTIC Archive, Duff,R E, S-CUBED LA JOLLA CA, *EXPLOSIONS, *SHOCK TUBES, SIMULATORS, AIRBURST,...

A numerical experiment is described in which an attempt was made to reduce the calculation time of a two-dimensional, Lagrangian, hydrodynamics code, without loss of accuracy. The reduction was accomplished by utilizing a space-dependent time step; i.e., the frequency with which a point is calculated depends on the rate at which changes are occurring in the vicinity of the point. This system permitted savings to be made by eliminating calculations in regions undergoing relatively slow changes.

Topics: DTIC Archive, Browne, Phillip L, LOS ALAMOS NATIONAL LAB NM, *HYDRODYNAMIC CODES, TWO DIMENSIONAL,...

This Coastal and Hydraulic Engineering Technical Note (CHETN) describes the methodology and input requirements for the leaky-barrier boundary feature in the Advanced Circulation (ADCIRC) coastal hydrodynamics code versions 40.02 and higher. This feature calculates flow over and through structures such as levees and jetties.

Topics: DTIC Archive, ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB,...

This work involves using computer simulations to understand the formation of complex structures by dynamical systems, particularly hydrodynamic ones. For the last year we have performed computer simulation of the production of space-time structures. Keywords: Viscous fingering and singularity formation, Dissipative dynamical systems, Lagrangian description of magnetic bubbles, Thermal plumes.

Topics: DTIC Archive, CHICAGO UNIV IL, *COMPUTERIZED SIMULATION, *HYDRODYNAMIC CODES, PRODUCTION, DYNAMICS,...

In this work we will employ an unstructured grid, coupled wave-current-sediment model to study the influence of wave-induced near bottom stresses on the sediment transport and morphological change within the Skagit River delta and Skagit Bay in Western Washington. The resulting coupled wave-current model will resolve the influence of external processes, including tidal forcing, buoyant river discharge, fluvial sediment supply and wind on tidal flat sediment transport. It will be used to...

Topics: DTIC Archive, MASSACHUSETTS UNIV DARTMOUTH SCHOOL FOR MARINE SCIENCE AND TECHNOLOGY, *SEDIMENT...

A method is described for the implementation of a time dependent striation structure and convection model into an existing systems code. The purpose is to update estimates of the scintillation effects of the structuring of the ionization of high altitude nuclear bursts on satellite radio signals. The structure and convection model is an extrapolation of the results of a numerical calculation for an idealized situation to the nuclear case combined with a late time bifurcation model.

Topics: DTIC Archive, Sachs, David L, SCIENCE APPLICATIONS INC LA JOLLA CA, *NUCLEAR EXPLOSIONS,...

The objective of this investigation is to identify the best code for calculating the unsteady forces and moments on surface ship propellers during noncavitating operating conditions. The codes being evaluated are MPUF-3A and PROPCAV from the University of Texas at Austin, and PUF-2 and PUF-14 from the Massachusetts Institute of Technology. The theoretical and numerical methods used by the codes are examined, and calculations of blade forces and moments are compared to measurements for several...

Topics: DTIC Archive, Fuhs, Donald, NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD, *HYDRODYNAMIC...

Electroexcitation of 140 Ce was studied using 92 MeV electrons at scattering angles of 90 and 105 deg, and 80 MeV electrons at 90 deg. An analysis was made using DWBA calculations and the hydrodynamic model. The results agree with previous experiments in cerium and other nuclei and, generally, with the calculations of Bohr and Mottelson, Hamamoto, and Liu and Brown. The Delta T assignments were based on microscopic and macroscopic considerations.

Topics: DTIC Archive, Hass, Hubert, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *CESIUM, *NUCLEAR RESONANCE,...

This report presents analyses of the detailed physical processes of importance in imploding wire and gas puff plasmas. Accurate treatment of the atomic physics and radiation transport underlying the x-ray exchange and output is emphasized. Feedback coupling of radiation and hydrodynamics are examined through use of coupled radiation hydrodynamics codes and analysis of motional Doppler broadening of line radiation.

Topics: DTIC Archive, Apruzese,John, SCIENCE APPLICATIONS INC MCLEAN VA, *PLASMAS(PHYSICS), *EXPLODING...

Magnetohydrodynamic stability of force free spheromak plasmas to n=1 free boundary tilt and radial shift modes is studied. The exterior region of open field lines is treated either as a conducting plasma or as a vacuum. In the former case the effect of line typing of the open field lines is present and is found to improve stability greatly. The equilibria which have optimum stability properties to the tilt and shift modes have a length to diameter ratio of 0.6, and can be stable with conducting...

Topics: DTIC Archive, Finn,J M, NAVAL RESEARCH LAB WASHINGTON DC, *PLASMAS(PHYSICS), *MAGNETOHYDRODYNAMICS,...

A mine-soil-structure interaction problem with a landmine buried in two different soil types was modeled using a hydrodynamic code. Because the actual soil types can vary widely between experiments the problem was bracketed between two widely differing soil types-dry sand and fully saturated tuff. The ballistic pendulum anvil plate acts as a momentum trap for a vertical impulse measurement facility (VIMF) under development at Aberdeen Proving Ground, MD. The model allows simulation of complex...

Topics: DTIC Archive, NATIONAL DEFENSE INDUSTRIAL ASSOCIATIONARLINGTON VA, *SYMPOSIA, *ARMY EQUIPMENT,...

Targets have been designed that produce moderate to high gain when directly driven by lasers. The intrinsic sensitivity of these targets to hydro instabilities is found using the FAST(2D) multidimensional radiation hydrocode [J.H. Gardner, A.J. Schmitt, J.P. Dahlburg, et al., Phys. Plasmas 5, 1935 (1998)], which simulates the simultaneous behavior of a large bandwidth (e.g., l = 2-256) of perturbations from compression to acceleration, and then to stagnation and burn. The development of the...

Topics: DTIC Archive, Schmitt, Andrew J, NAVAL RESEARCH LAB WASHINGTON DC, *IMPLOSIONS, *HYDRODYNAMIC...

Methods of differencing the Eulerian form of the hydrodynamic equations are investigated. One wishes to find a method for machine calculations that could be used in hydrodynamic problems involving large distortions of matter in two space dimensions. Boundaries between materials are to be carried and moved through the fixed Eulerian mesh. Given a mesh at some time and with proper boundary conditions, the problem will be to carry the values of the quantities stored in each mesh point forward in...

Topics: DTIC Archive, Longley, Jerry, LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM, *HYDRODYNAMIC CODES, *EULER...

This report describes research undertaken by Mission Research Corporation during 1983-84 in support of the experimental effort to model effects of high altitude nuclear bursts using high power lasers. Hydrodynamic simulations of experiments at NRL are discussed; the appropriate scaling laws are derived for variation of all important experimental parameters.

Topics: DTIC Archive, Stellingwerf,R F, MISSION RESEARCH CORP ALBUQUERQUE NM, *PLASMAS(PHYSICS), *LASERS,...

Preliminary results on the hydrodynamics and Stark calculations of the AFGL-LINUS plasma are presented. Also reported is a kinetic analysis based on the most recent spectroscopic temperatures. Various calculations of different aspects of the LINUS plasma are shown. Finally, the codes (EXCEDE/ARTIC) which have potential applications to LABCEDE are discussed. Keywords: Infrared emissions; Oxygen plasma, Rydberg states, Nuclear effects.

Topics: DTIC Archive, Ip, Precila C, VISIDYNE INC BURLINGTON MA, *PLASMAS(PHYSICS), *HYDRODYNAMIC CODES,...

HLLSRF is a system for representing ship hulls for use in computer programs. In particular, it has been designed to be used with programs which calculate the hydrodynamic properties of ship hulls. HLLSRF uses a parametric tensor product B-spline representation of the hull in which one of the parameters is the station number. Complex hull shapes may be generated by allowing non-rectangular domains in parameter space. Variations of existing hulls can be represented by specifying how they differ...

Topics: DTIC Archive, Hally, David, DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA),...

A method is presented for obtaining numerical solutions of the Eulerian hydrodynamic equations for supersonic compressible flows. The procedure is an adaptation of the PlC method to the case of a continuous fluid. Some discussion is given concerning the limitations of the procedure; the conservation of mass, energy, and momentum; and the treatment of rigid obstacles and two-fluid interfaces. Examples of calculations for flows past a number of cylindrically symmetric objects are also presented.

Topics: DTIC Archive, Rich, Marvin, LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM, *EULER EQUATIONS, *SUPERSONIC...

Two-dimensional hydrodynamics calculations were made with the STEALTH code to determine the response under 10 GPa loading of three designs of the SAI particle velocity gage. The calculations showed which design best measured the free field particle velocity. Two-dimensional calculations were also made for four designs of the SRI cylindrical stress gage. The calculations determined that the internal gage dynamics, particularly shock reflections, were primarily responsible for differences between...

Topics: DTIC Archive, Schlaug, R N, SCIENCE APPLICATIONS INC LA JOLLA CA, *CRATERING, *NUCLEAR EXPLOSION...

A description is given of the current status of the Eulerian computations of a detonating cylinder above water. Calculations were made of pressure-time histories in the water resulting from the detonation of a one-pound cylinder of pentolite initially one foot above the surface. A two-dimensional Eulerian hydrodynamic code (CSQ) was used to obtain reflected pressures at the surface (considered rigid). These pressures were then used as input to a linear acoustic code for the propagation in the...

Topics: DTIC Archive, Lutzky, Morton, NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD,...

This work is concerned with shock initiation in munitions. As a numerical experiment, twenty computations have been performed to simulate three basic types of detonation transfer between munitions at small separations. All computations show two distinct reactive flows, with shock waves communicable between them. The numerical aspects of these can serve to explain the mechanism and development of the detonation phenomena. One after the other, shock impulses arrive at the munition or acceptor...

Topics: DTIC Archive, Huang, Y. K., ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *NUMERICAL...

This manual documents the SMERF hydrodynamic code. SMERF was written at the New Mexico Institute of Mining and Technology, Socorro, NM, and at the Naval Air Warfare Center Weapons Division, China Lake, CA. The code has general applicability, but has been most exercised toward simulation of shock initiation and sympathetic detonation of explosives.

Topics: DTIC Archive, Lundstrom, Eric, NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA, *EXPLOSIONS,...

Higher order and finely zoned calculations with the SHARC code have indicated that the tops of intermediate attitude fireballs are unstable. This report describes the characteristics of the instabilities and their evolution. To aid in the understanding and interpretation of the computed fireball instabilities, a number of idealized numerical experiments of the Rayleigh- Taylor and Richtmyer-Meshkow instabilities were completed. A strong zoning dependent numerical viscosity was noted. Results...

Topics: DTIC Archive, Carney, Theodore C, S-CUBED ALBUQUERQUE NM, *HYDRODYNAMIC CODES, *NUCLEAR FIREBALL,...

CFDSHIP-IOWA is a general-purpose unsteady Reynolds-averaged Navier-Stokes CFD code that has been developed, over the past 10 years, to handle a broad range of ship hydrodynamics problems. Originally designed to support both thesis and project research in the areas of resistance and propulsion, it has been successfully transitioned to Navy and university laboratories and industry, and has recently been extended to unsteady applications such as seakeeping and maneuvering. It was developed...

Topics: DTIC Archive, Paterson, Eric G, IOWA INST OF HYDRAULIC RESEARCH IOWA CITY, *HYDRODYNAMIC CODES,...

This report presents calculational results for cylinder impact tests and self forging fragment tests for several copper and tantalum specimens. The calculations provide estimates of room temperature yield strength for these specimens.

Topics: DTIC Archive, Osborn,John J, AIR FORCE ARMAMENT LAB EGLIN AFB FL, *COPPER, *TANTALUM, COMPUTER...

The HULL hydrocode is used to predict the shock attenuation within a non-initiating explosive target following thin flyer plate impact. The attenuation relationship between the flyer plate thickness and the initial velocity is investigated. Agreement between HULL predictions and a simple theoretical model is provided. The HULL results may be employed to predict the maximum depth within which initiation may occur.

Topics: DTIC Archive, Waschl, J, MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA), *EXPLOSIONS, *HYDRODYNAMIC...

Plasmas are subject to many instabilities that make control of their components particularly difficult. It is well known that z-pinches are subject to Rayleigh-Taylor-like instabilities. This report analyzes MJ-level, 50 ns gas-puff z-pinches performed on the Saturn accelerator at Sandia National Laboratory with the magnetohydrodynamic codes Mach2 and Mach3. This analysis indicates that the uniformity of the pinch depends on the thickness of the initial gas-puff. Three-dimensional calculations...

Topics: DTIC Archive, Roderick, Norman F., PHILLIPS LAB KIRTLAND AFB NM, *HYDRODYNAMIC CODES, *PLASMA...

We solve two hydrodynamical problems. The first involves a shock wave, a contact discontinuity, and a rarefaction wave using an unconditionally stable finite difference scheme. The Courant condition is satisfied everywhere except in one zone behind the shock, where it is violated by factors of 10 and 100. The nonlinear difference equations are solved by Newton's method. The total number of Newton iterations to get to a certain time is apparently independent of the degree to which the normal...

Topics: DTIC Archive, Turner, James, LOS ALAMOS SCIENTIFIC LAB ALBUQUERQUE NM, *SHOCK WAVES, *EXPLOSIONS,...

The objective of this study is the development of a vectorized, multiprocessing global spectral model (GSM) with enhanced physical parameterizations. The starting point for this work is the current Geophysics Laboratory (GL) GSM. Described is the multitasking and vectorization design for the GSM. One proposes to implement the latitude tasking scheme for multiprocessing the loop over latitude in the calculation of spectral tendencies and adjusted model variables. The general truncation version...

Topics: DTIC Archive, Nehrkorn, T, ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC CAMBRIDGE MA, *GLOBAL,...

This report presents hydrocode calculations and a model describing them for penetrations of finite thickness concrete slabs by steel penetrators travelling at 100 to 500 m/s. The report also discusses the effects of saturation on loading on penetrators. (Author)

Topics: DTIC Archive, Osborn,John J, ORLANDO TECHNOLOGY INC SHALIMAR FL, *PROJECTILES, *CONCRETE,...

This report presents the concept and results of calculations of the use of colliding concentric cylindrical foil liners to produce collapsing radiation cavities. The concept is to use a magnetic pressure driven foil plasma liner to implode on a second interior liner at several tens of centimeters per microsecond. The outer liner collision with the inner liner converts the implosion kinetic energy to thermal energy, with temperatures of 100 to 200 electron volts possible. The calculations were...

Topics: DTIC Archive, Alme, M., LOS ALAMOS NATIONAL LAB NM, *PLASMAS(PHYSICS), *MAGNETOHYDRODYNAMICS,...

A two-dimensional r-z fluid code has been developed to study the interaction between a relativistic electron beam and an anode plasma. A self-consistent treatment of the electromagnetic fields has been included. Radial pinching of the beam is observed when its self-field resistively diffuses into the plasma. (Author)

Topics: DTIC Archive, Colombant,D G, NAVAL RESEARCH LAB WASHINGTON D C, *PLASMAS(PHYSICS), *ELECTRON BEAMS,...

Computer hydrocodes are essential in determining the magnitude, transmission, and effects of stresses produced when energy is impulsively deposited in a material. As do any solutions of the hydrodynamic equations, these numerical approaches depend upon the form of an auxiliary equation of state for their success. Most hydrocodes give satisfactory treatment in the solid and liquid phases but in codes such as PUFF and RIP the equations of state ignore or improperly treat the liquid-vapor phase...

Topics: DTIC Archive, Burden, Henry S, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *EXPLODING...

An expansion wave is produced when an incident shock wave interacts with a surface separating a fluid from a vacuum. Such an interaction starts the feedout process that transfers perturbations from the rippled inner (rear) to the outer (front) surface of a target in inertial confinement fusion. Being essentially a standing sonic wave superimposed on a centered expansion wave, a rippled expansion wave in an ideal gas, like a rippled shock wave, typically produces decaying oscillations of all...

Topics: DTIC Archive, Velikovich, A L, NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV, *SHOCK WAVES,...

Several improvements have been incorporated into the XAIR overset-mesh flow solver which substantially improve the capability of the code to perform time-accurate solutions. These improvements include implementing an upwind flux formulation combined with a quasi-Newton relaxation time-stepping strategy. The code includes a very stable k-e turbulence model which can be used with or without wall function boundary conditions. Results are presented for two moving body cases and two unsteady flows....

Topics: DTIC Archive, Nichols, R. H., SVERDRUP TECHNOLOGY INC ARNOLD AFS TN, *ALGORITHMS, *COMPUTATIONAL...

The use of locally embedded tracers within laser-irradiated solid targets has led to a new class of diagnostic methods for laser-produced plasmas. Demonstrated uses of tracers include the first visualizations of hydrodynamic flow of laser-ablated materials and improved spectroscopic measurements of plasma density and temperature profiles; comparisons with a two-dimensional hydrodynamics computer code are shown. Proposed future uses of tracers include the first measurements of fluid velocity...

Topics: DTIC Archive, Herbst,M J, NAVAL RESEARCH LAB WASHINGTON DC, *ABLATION, *TARGETS, *LASER BEAMS,...

Witness packs are used to obtain the mass velocity distribution of fragments generated, for example, at complete perforation of a target. A witness pack consists of several metallic layers of various materials and thicknesses spaced evenly. The STANAG 4190 description requires a low density Styrofoam spacer between the layers. Previous computer simulations of witness packs have been reported but were simplified by using air gaps. This document describes new computer simulations with a low...

Topics: DTIC Archive, McIntosh, G., DEFENCE RESEARCH ESTABLISHMENT VALCARTIER (QUEBEC), *DAMAGE ASSESSMENT,...

The dominant physics affecting spherical and cylindrical plasma implosions is studied. Detailed modeling of opacity sources, line and continuum emission, and coupled hydrodynamics is presented. Simulations of actual experimental spectra, plasma mixture experiments, and improved photon transport methods are described. Z-pinch code benchmarks, and output predictions for various elements and mass loads are given.(Author)

Topics: DTIC Archive, Kane,Edward, SCIENCE APPLICATIONS INC MCLEAN VA, *Plasmas(Physics), *Emission...

High-explosive-driven blast waves contain a contact surface (denoting the interface between the detonation products and the air) which is Rayleigh- Taylor instability. The kinematics of the mixing at this surface was studied numerically with a one-dimensional hydrocode. A K-e(Epsilon) turbulence model was used to simulate the growth and decay of turbulence for this problem; source terms were included to model the Rayleigh-Taylor instability mechanism. The numerical calculations demonstrate that...

Topics: DTIC Archive, Kuhl, Allen L., R AND D ASSOCIATES MARINA DEL REY CA, *KINEMATICS, *BLAST WAVES,...

The NPARC Alliance provides a publicly available, Internet based archive of analytical, experimental, and computational data suitable for validation of computational fluid dynamics (CFD) codes. The primary objective of the Archive is validation of the WIND code, the primary CFD solver of the Alliance, and making the validation results available to the CFD community at large. The secondary objective is to provide the aerospace community a forum for CFD validation efforts. This paper discusses...

Topics: DTIC Archive, Tatum, Kenneth E., SVERDRUP TECHNOLOGY INC ARNOLD AFS TN, *DATA BASES, *COMPUTATIONAL...

As part of the DNA stemming and containment program for underground nuclear testing, laboratory investigatons were carried out in three areas: generation of experimental results suitable for correlation with predictions of computer codes used in DNA grout flow calculations, development of a containment experiment for studying residual stress fields around exploded cavities, and a theoretical analysis for studying the residual stress fields. Grout flow results were generated and supplied in a...

Topics: DTIC Archive, Florence, A L, STANFORD RESEARCH INST MENLO PARK CA, *NUCLEAR EXPLOSIONS,...

This report documents the development and preliminary testing of shore cells (partly fluid-partly rigid cells) in an airblast version of the HULL hydro- dynamic computer code at the BRL (Air Force Weapons Laboratory version 8, with modifications). The report discusses the differential and the difference equations for inviscid fluid flow in HULL and the implementing of shore cells in 2-D Cartesian and cylindrical coordinates. A listing of the changes (using the CDC utility UPDATE) is included in...

Topics: DTIC Archive, Chambers,Burton S , III, SCIENCE APPLICATIONS INC MCLEAN VA, *HYDRODYNAMIC CODES,...

Efficient technology transfer from the basic research community to the engineering development community is essential for maintaining technological competitiveness. However, the research and the design communities have different objectives, and they also have different perspectives on relevant technical knowledge. In this work, the communication issues resulting from the differing perspectives of these two communities are addressed with a hypertext knowledge presentation system for technology...

Topics: DTIC Archive, Rodman, Laura C, NIELSEN ENGINEERING AND RESEARCH INC MOUNTAIN VIEW CA, *TECHNOLOGY...