An equation of state model, including the solid to liquid and liquid to vapor phase transitions, has been developed. It is applicable for materials which usually melt, rather than sublimate, and whose vapor consists of atomic species. The parameters appearing in the formulation are completely determined from a limited amount of data which, for many materials, is currently available. A computer program which gives the pressure as a function of volume and internal energy has been written and used...
Topics: DTIC Archive, Goodwin, Lester K, PHILCOFORD CORP NEWPORT BEACH CA AERONUTRONIC DIV, *PHASE...
The book concerns the dynamic response of materials due to intensive impulsive loadings. The materials considered are primarily solids, although most of the discussions are also applicable to fluids. The loading and response in general happen within a very short time, in the order of microseconds, rather than milliseconds. The duration of the loading, whether mechanical impact or thermodynamic energy input, may sometimes be described in terms of nanoseconds. The magnitude of the loading is such...
Topics: DTIC Archive, Hopkins, Alan K, AIR FORCE MATERIALS LAB WRIGHTPATTERSON AFB OH, *MATERIALS,...
The modeling of power systems has been primarily driven by the commercial power utility industry. These models usually involve the assumption that system bus voltage and frequency are constant. However, in applications such as shipboard power systems this infinite bus assumption is not valid. This thesis investigates the modeling of a synchronous generator and various loads in a modular fashion on a finite bus. The simulation presented allows the interconnection of multiple statespace models...
Topics: DTIC Archive, Kipps, Mark R, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *COMPUTER PROGRAMS, *ELECTRIC...
The Army's inchoate professional Ethic attempts to fill a significant gap in the Army's attempt to maintain professional status. It demonstrates the intentionality to address ethical failures by promulgating an aspirational Ethic focused on The Trustworthy Army Profession who has character, competence, and commitment. Is the Army Ethic sufficient for the Army profession? The Army Ethic passes screening criteria from an external literature review, which makes it a viable option as an Ethic. It...
Topics: DTIC Archive, ARMY COMMAND AND GENERAL STAFF COLLEGE FORT LEAVENWORTH KS, *EXPLOSIVES*EXPLOSIVES,...
GFSSP has been extended to model conjugate heat transfer Fluid Solid Network Elements include: a) Fluid nodes and Flow Branches; b) Solid Nodes and Ambient Nodes; c) Conductors connecting FluidSolid, SolidSolid and SolidAmbient Nodes. Heat Conduction Equations are solved simultaneously with Fluid Conservation Equations for Mass, Momentum, Energy and Equation of State. The extended code was verified by comparing with analytical solution for simple conductionconvection problem The code was...
Topics: NASA Technical Reports Server (NTRS), FLUID FLOW, CRYOGENICS, CONDUCTIVE HEAT TRANSFER, EDUCATION,...
A soil cap model was analyzed and an equationofstate based on this model was developed and implemented in a onedimensional, wavepropagation code. The model was used to match laboratory data of a sand material and to estimate the dynamic insitu properties of a clay material from Cylindrical InSitu Test (CIST) data. Comparisons were made between the experimental data and the results obtained with the cap model and another constitutive model; both models gave similar results with the cap...
Topics: DTIC Archive, Fedock, Joseph J, NEW MEXICO UNIV ALBUQUERQUE, *COMPUTERIZED SIMULATION, *GROUND...
The equilibrium condition for water and ice in an airfree porous medium is presented. The equation of state for this system is the Clapeyron equation. This equation is presented in a general form that explicitly shows the pressuredifference dependence with temperature for water and ice. Five solution scenarios are then discussed in terms of applicability to porous media. (AN)
Topics: DTIC Archive, Black, Patrick B., COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH, *WATER,...
Although bioinspired legged robots have advantageous mobility, they can be very inefficient. Their intrinsic walking mobility is sometimes outweighed by the inefficiency of their drivetrain. Some of these inefficiencies are due to collision losses, but they are also due to suboptimal powering schemes. This paper addresses the powering schemes and seeks to clearly delineate an optimal solution to powering the walking motion of a twolegged or biped walker. We examine a simplified model of...
Topics: DTIC Archive, ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI,...
This report documents research performed to enable the EPIC 3D lagrangian hydrocode to run in a linked mode with the hull 3D Eulerian hydrocode. The linked mode is required to efficiently and accurately model multiple target plate impact and penetration events. The report also documents many changes made to make EPIC more user oriented and simple to run.
Topics: DTIC Archive, Osborn, John J, ORLANDO TECHNOLOGY INC SHALIMAR FL, *ARMOR PIERCING AMMUNITION,...
Some Xray spectral observations of approximately 30 clusters of galaxies from HEAO1 are summarized. There exists strong correlations between Xray luminosity, L(x), and temperature kT in the form L(x)alphaT to the 2.3 power. This result combined with the L(x) central galaxy density relation and the virial theorem indicates that the core dadius of the gas should be roughly independent of L(x) or KT and that more luminous clusters have a greater fraction of their virial mass in gas. The poor...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL SPECTROSCOPY, EMISSION SPECTRA, GALACTIC...
A computer program for numerically solving the equations governing a laminar, premixed, onedimensional flame is described. Both unbounded flames and burner stabilized flames are discussed. Some numerical considerations in successfully using the code are presented.
Topics: DTIC Archive, Coffee, Terence P., ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPUTER...
Over the past few years RWME has been investigating the use of the liquid helium droplet beam technique to generate of single component and composite nanoclusters at low temperature, deposit the clusters onto various substrates, and then investigate the stability, chemical, and physical properties of the subsequent clusterbased material. This report provides an annual status update in the understanding of the environment of the clusters prior to, during, and after collision of the doped...
Topics: DTIC Archive, Ridge,Claron J, Munitions Directorate Eglin AFB United States, energetic materials,...
Basic shock wave equations and theory of hydrodynamic impact are discussed. The impedance match method for determining Hugoniots is outlined. Empirical data from the Hugoniot can be used to calculate temperatures associated with the passage of shock waves. The bases for these calculations are described. A number of empirical equations, some of which are useful for computer calculations and others for graphical description are tabulated. It has been found that in most instances, a linear...
Topics: DTIC Archive, Rinehart, John S, RINEHART AND ASSOCIATES GOLDEN CO, *SHOCK WAVES, *HYDRODYNAMICS,...
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A DYNAMIC SUBSTRUCTURING ANALYSIS, UTILIZING THE COMPONENT MODES TECHNIQUE, OF THE 1/8 SCALE SPACE SHUTTLE ORBITER FINITE ELEMENT MODEL IS PRESENTED. THE ANALYSIS WAS ACCOMPLISHED IN 3 PHASES, USING NASTRAN RIGID FORMAT 3, WITH APPROPRIATE ALTERS, ON THE IBM 360370. THE ORBITER WAS DIVIDED INTO 5 SUBSTRUCTURES, EACH OF WHICH WAS REDUCED TO INTERFACE DEGREES OF FREEDOM AND GENERALIZED NORMAL MODES. THE REDUCED SUBSTRUCTURES WERE COUPLED TO YIELD THE FIRST 23 SYMMETRIC FREEFREE ORBITER MODES,...
Topics: CONTROLLABILITY, LINEAR SYSTEMS, OPTIMAL CONTROL, CONTROL STABILITY, DECISION MAKING, EQUATIONS OF...
Topics: DTIC Archive, Boley,Bruno A, NORTHWESTERN UNIV EVANSTON IL TECHNOLOGICAL INST, *HEAT TRANSFER,...
Numerical calculations of the charge state distributions of test ions in a hot plasma under nonequilibrium conditions are presented. The mean ionic charges of heavy ions for finite residence times in an instantaneously heated plasma and for a nonMaxwellian electron distribution function are derived. The results are compared with measurements of the charge states of solar energetic particles, and it is found that neither of the two simple cases considered can explain the observations.
Topics: NASA Technical Reports Server (NTRS), CHARGE DISTRIBUTION, ENERGETIC PARTICLES, EQUATIONS OF STATE,...
An experimental program was carried out in the 10 to the 8 to 10 to the 2 power torr region to supply basic information on the adsorption of noncondensable gases at 77 K and to establish the functional dependence of adsorption rate on pressure and amount of gas adsorbed. From the experimental results, analytical expressions are developed which describe the behavior of adsorption rate in terms of the adsorption parameters for high vacuum, low temperature conditions. These expressions are shown...
Topics: DTIC Archive, Kindall, S M, ARO INC ARNOLD AFS TN, *CHARCOAL, ADSORPTION, ARGON, EQUATIONS OF...
This report documents research performed to enable the EPIC 3D lagrangian hydrocode to run in a linked mode with the hull 3D Eulerian hydrocode. The linked mode is required to efficiently and accurately model multiple target plate impact and penetration events. The report also documents many changes made to make EPIC more user oriented and simple to run.
Topics: DTIC Archive, Osborn, John J, ORLANDO TECHNOLOGY INC SHALIMAR FL, *ARMOR PIERCING AMMUNITION,...
The functional correctness technique is presented and explained. An implication of the underlying theory for the derivation of loop invariants is discussed. The functional verification conditions concerning program loops are shown to be a specialization of the commonly used inductive assertion verification conditions. The functional technique is compared and contrasted with subgoal induction. Finally, the difficulty of proving initialized loops is examined in light of the inductive assertion...
Topics: DTIC Archive, Dunlop,Douglas D, MARYLAND UNIV COLLEGE PARK DEPT OF COMPUTER SCIENCE, *COMPUTER...
Methods of obtaining the Hugoniot equation of state were investigated. Several of these, employing high explosive devices, were used to obtain Hugoniot data for mineral samples common to many igneous rocks. Hugoniot data werefound for orthoclase, oligoclase, labradorite and olivine in the pressure range from 50 to 300 kilobars. Analytical synthesis models were constructed and used to determine the synthesized Hugoniot equations of state for granodiorite, gabbro and dunite. These compared...
Topics: DTIC Archive, Dennen, Robert S, IIT RESEARCH INST CHICAGO IL, *IGNEOUS ROCK, *MINERALS, EQUATIONS...
The expectation of certain integrals of functionals of continuous time Markov chains is estimated by simulation over a finite horizon, fixed or random. By computing conditional expectations given the sequence of states visited (and possibly other information), we reduce variance. This is discrete time conversion. Efficiency is further increased by combining discretetime conversion with stratification and splitting.
Topics: DTIC Archive, Fox, Bennett L, STANFORD UNIV CA DEPT OF OPERATIONS RESEARCH, *MARKOV PROCESSES,...
Simple empirical equations are given which permit the calculation of the detonation pressures and velocities of CHNO explosives. The detonation pressures so derived correspond quite closely to values predicted by the computer code RUBY (see AEC report UCRL6815 or NASA report N6216450), which employs the most recent parameters and covolume factors with KistiakowskyWilson equation of state.
Topics: DTIC Archive, Kamlet, Mortimer J, NAVAL ORDNANCE LAB WHITE OAK MD, *EXPLOSIVES, *DETONATIONS,...
Recently it has been argued based on theoretical calculations and experimental data that there is a universal form for the equation of state of solids. This observation was restricted to the range of temperatures and pressures such that there are no phase transitions. The use of this universal relation to estimate pressurevolume relations (i.e., isotherms) required three input parameters at each fixed temperature. It is shown that for many solids the input data needed to predict high...
Topics: NASA Technical Reports Server (NTRS), BULK MODULUS, EQUATIONS OF STATE, SOLID STATE, TEMPERATURE...
Mathematical models to be used in the control system design were developed. A computer program, which takes aerodynamic and structural data for the ARW2 aircraft and converts these data into state space models suitable for use in modern control synthesis procedures, was developed. Reduced order models of inboard and outboard control surface actuator dynamics and a second order vertical wind gust model were developed. An analysis of the rigid body motion of the ARW2 was conducted. The deletion...
Topics: NASA Technical Reports Server (NTRS), ACTUATORS, CONTROL SIMULATION, CONTROL SURFACES, DATA...
Sensitivity to track initialization error is quantified as a function of clutter density for the nearest neighbor assignment function (NNAF). Quality of track initialization is thereby related to assignment accuracy. Two statistical distributions of track initialization error are derived under idealized hypotheses representing excellent and poor performance of the NNAF in clutter. A track initialization error region is obtained by constraining the mean initializing error under the excellent...
Topics: DTIC Archive, Streit, Roy L., NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV RI, *TRACKING, *STATISTICAL...
HELP is a twodimensional, multimaterial, Eulerian Code for solving material flow problems in the hydrodynamic and elasticplastic regimes. Although the code is basically Eulerian, material interfaces and free surfaces are propagated through the Calculation Mesh, in a Lagrangian manner, as discrete interfaces across which the materials are not allowed to interdiffuse. This interface treatment gives HELP a distinct advantage over other pure Eulerian Codes and allows it to be applied to the...
Topics: DTIC Archive, Hageman, Laura J, Wilkins, Darin E, Sedgwick, Robert T, Waddell, Jerry L, SYSTEMS...
Experiments and direct numerical simulations (DNS) were conducted on shear layers at subcritical to supercritical pressures. The experiments were performed on singlecomponent coaxial jets, where the slower inner flow was liquid nitrogen, the faster outer flow was cold gaseous nitrogen, and the environment was room temperature gaseous nitrogen. The experiments were performed with and without the effects of transverse acoustic waves. Careful attention was given to measuring all the initial and...
Topics: DTIC Archive, Davis, Dustin W, ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA,...
The objective of this program was to develop an accurate and fast simulation methodology for supercritical injection and mixing using molecular dynamics (MD). The use of MD allows the supercritical mixing to occur naturally' without the need for tracking phase boundaries and intrinsically includes all physical processes, material properties and equations of state in both subcritical and supercritical environments. MD also allows the tracking of injected liquid molecules into the chamber...
Topics: DTIC Archive, Micci, Michael M, PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF AEROSPACE...
The almost exponential increase in computer power over the last few decades has opened up the venue for increasingly more advanced and accurate computer simulations. As little as ten years ago, quantum mechanical calculations were restricted to predictions of static properties of systems containing tens of atoms, thus limiting first principles explorations to gas phase chemical and physical processes. With today's computers, quantum mechanical calculations can easily be performed for solids and...
Topics: DTIC Archive, Romero, N A, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *ENERGETIC PROPERTIES,...
A perturbation technique which is particularly well suited for high pressures is used to calculate thermodynamic properties for a simple liquid whose molecules interact via a Buckingham (exp6) potential. There is good agreement between computations and experiments for moderate temperature isotherms for liquid nitrogen. A calculation of the shock Hugoniot of liquid nitrogen exhibits excellent agreement with experimental data. (Author)
Topics: DTIC Archive, Jones,Hermenzo D, NAVAL SURFACE WEAPONS CENTER SILVER SPRING MD, *PERTURBATION...
The effect of stationary, uniform, electric, and magnetic fields on steadystate detonation of condensed explosives is studied. The electrical conductivity profile in the region of the reaction zone provides a current path and Joule heating. Expected increases of detonation velocity and pressure by Joule heating are computed using an Abel equation of state. It is shown that the detonation pressure of TNT can be increased by as much as 12% and detonation velocity by as much as 6% before...
Topics: DTIC Archive, Toton, Edward T., NAVAL SURFACE WEAPONS CENTER WHITE OAK LAB SILVER SPRING MD,...
This paper investigates optimal control problems where there is uncertainty in the initial state measurement or where there are uncertain parameters in the state equations. It is assumed that nature will choose the uncertainty to maximize the cost which the controller is attempting to minimize. Thus a minmax control is sought. Sufficient conditions for a control to be a minmax control are presented. These conditions suggest methods for finding the minmax control and such techniques are...
Topics: DTIC Archive, Schmitendorf,W E, NORTHWESTERN UNIV EVANSTON IL DEPT OF MECHANICAL ENGINEERING,...
The dynamic shock responses of eight types of rocks and grouts were determined from onedimensional plate impact experiments to support the Defense Nuclear Agency (DNA) HYDROPLUS program. Hugoniot data and loading and release paths were measured using insitu stress gauges and VISAR interferometry. Four rocks, (HUNTERS TROPHY tuff, UTTR limestone, Pennsylvania slate and permafrost phyllite), a highdensity silicate grout (BEXGC1 grout), natural and simulated jointed phyllite and ice were...
Topics: DTIC Archive, Davies, Frank W, KTECH CORP ALBUQUERQUE NM, *NUCLEAR EXPLOSIONS, *ROCK MECHANICS,...
A study is made of the thermal response of charring ablators to given environmental conditions. The heat protective materials considered form gases and a porous char as they undergo thermal degradation in depth. The analysis considers the transient conditions and the effect of porosity pressure on the gas pressure buildup within the porous char. The effects of porosity and permeability are included. Results of the temperature, material density, and gas pressure distribution through the heat...
Topics: DTIC Archive, Mathieu, R D, GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV, *REENTRY...
This report discusses the feasibility of making temperature profile measurements in the fuel preburner of the main engine of the space shuttle (SSME) using coherent antiStokes Raman spectroscopy (CARS). The principal thrust of the work is to identify problems associated with making CARS measurements in high temperature gas phase hydrogen at very high pressures (approx 400 atmospheres). To this end a theoretical study was made of the characteristics of the CAR spectra of H2 as a function of...
Topics: NASA Technical Reports Server (NTRS), BURNERS, SPACE SHUTTLE MAIN ENGINE, TEMPERATURE MEASUREMENT,...
Secondary instabilities are examined in compressible boundary layers at Mach numbers M(sub infinity) = 0, 0.8, 1.6, and 4.5. It is found that there is a broadband of highly unstable 3d secondary disturbances whose growth rates increase with increasing primary wave amplitude. At M(sub infinity) is less than or equal to 1.6, fundamental resonance dominates at relatively high (2d) primary disturbance amplitude, while subharmonic resonance is characterized by a low (2d) primary amplitude. At...
Topics: NASA Technical Reports Server (NTRS), BOUNDARY CONDITIONS, COMPRESSIBLE BOUNDARY LAYER, FLOW...
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The DART is a system of two cylindricalparabolic reflectors. One reflector will produce a line focus; two reflectors properly oriented will produce a point focus. For farinfrared/submillimeter missions, the DART presents a compelling new telescope architecture that is scalable to alrge apertures, and with it's large membrane area is well suited to passive cooling.
Topics: HYDRODYNAMICS, SPALLATION, ALUMINUM, IMPACT VELOCITY, COMPUTERIZED SIMULATION, MATHEMATICAL MODELS,...
The authors report an interceded oscillation in a wind and thermallydriven ocean general circulation model (OGCM). The oscillation is tantalizing in that it occurs under a relatively strong thermal damping (26.3 W m(exp2)K(exp1). Examinations involving a twodimensional OGCM, a simple thermal flipflop model and a threedimensional OGCM with and without the nonlinear effect of temperature in the state equation of sea water demonstrate that the oscillation is not driven by mechanisms such as...
Topics: DTIC Archive, Cai, Wenju, NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY, *THERMAL...
It has long been known that the ammonium ion NH4(+) behaves in many ways like an alkali metal ion. This report dicusses a possible transition (under pressure) from a mixture of ammonia and hydrogen (NH31/2H2) to metallic NH4 in the 'funny sodium' form. This form may be defined as a lattice composed of metallic NH4(+) ions and slike electrons (one per ion). The ion has the sodium Z number but only seven protons (those from N) are in the nucleus; the other four protons (those from the four H...
Topics: DTIC Archive, Gray,D M, ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY BENET WEAPONS...
When a plane shock wave moving through one material meets an interface with a new material, the shock is transmitted at a different strength into the target material and a new wave is reflected back into the parent material. The strength of the transmitted wave is determined in this report for the case when both materials are solid and can be described by a MieGruneisen equation of state.
Topics: DTIC Archive, Dienes, J K, GENERAL DYNAMICS SAN DIEGO CA GENERAL ATOMIC DIV, *SOLIDS, *SHOCK WAVES,...
SRI PUFF is a Lagrangian finite difference computer program for calculating onedimensional stress wave propagation through solid, liquid, gaseous, and porous materials. The calculational procedure is the standard leapfrog method of von Neumann and Richtmyer using artificial viscosity to smooth shock fronts. Planar, cylindrical, and spherical flow are treated. The constitutive relations include the standard MieGrueneissen equation of state and elastic, plastic (Mises or Coulomb) workhardening...
Topics: DTIC Archive, Seaman, L, SRI INTERNATIONAL MENLO PARK CA, *COMPUTER PROGRAMS, *STRESS WAVES,...
In the past decade there has been much work on the sound generated underwater by a moving laser source. In particular, a great deal of effort has been directed toward understanding the thermoacoustic sound generation process, in which the laser heats the fluid medium and radiates sound as a result of the induced volumetric expansion. Theoretical predictions of the laser generated sound and experimental measurements have been shown to agree well for a wide range of source velocities, and...
Topics: DTIC Archive, Chandrasekhar, Rao J, TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS, *THERMAL SHOCK,...
In the past, real gas effects on the flame temperature were evaluated using the virial equation of state. Usually, the virial expansion was truncated after the third term. In this work, the equation of state for dense gases proposed by Haar and Shenker is considered. The implementation developed for H2O, CO, CO2, H2, and N2 by Powell, Wilmot, Haar, and Klein is used. The contribution of all minor species are assumed to be approximated by a LennardJones gas with epsilon/k = 100 K and sigma =...
Topics: DTIC Archive, Vladimiroff, T., ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY...
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The concept of local realism entails certain restrictions concerning the possible occurrence of correlated events. Although these restrictions are inherent in classical physics they have never been noticed until Bell showed in 1964 that general correlations in quantum mechanics can not be interpreted in a classical way. We demonstrate how a local realistic way of thinking about measurement results necessarily leads to limitations with regard to the possible appearance of correlated events....
Topics: COMPUTATIONAL FLUID DYNAMICS, COMPUTATIONAL GRIDS, CONTINUITY EQUATION, EQUATIONS OF STATE, HEAT...
Development of a theoretical treatment of detonation behavior by numecal integration is reported. One minor refinement was made in the mathematcal procedures. this was primarily in the interest of completeness, rather than any anticipated signifcant effect on the results of the integration. An important development was the iscovery that the use of the von Neuman ''q'' in integrating through a reactive shock can, under some circumtances, falsify the enropy increase and, as a consequence,...
Topics: DTIC Archive, BOYER, M H, PHILCO NEWPORT BEACH CA AERONUTRONIC DIV, *DETONATIONS, *SOLID ROCKET...
The three stable states of matter and the corresponding phase transitions were obtained with a single model. Patterned after LennardJones and Devonshires's theory, a simple cubic lattice model containing two fcc sublattices (alpha and beta) is adopted. The interatomic potential is taken to be the LennardJones (612) potential. Employing the cluster variation method, the Weiss and the pair approximations on the lattice gas failed to give the correct phase diagrams. Hybrid approximations were...
Topics: NASA Technical Reports Server (NTRS), EQUATIONS OF STATE, FACE CENTERED CUBIC LATTICES, LIQUID...
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Irradiation phenomenon related to manual navigation
Topics: FEEDBACK CONTROL, SYSTEMS ENGINEERING, MATHEMATICAL MODELS, OPTIMAL CONTROL, SYSTEMS ANALYSIS,...
Pressure, volume, and energy equation of state data obtained using shock wave techniques are presented for aluminum and Teflon. Solid aluminum samples initially at room temperature or preheated to near melting, and porous aluminum samples at room temperature, were studied over a pressure range of 200 to 1200 kbar. It was found that the largest variations of volume and energy could be achieved using porous samples. Values of Gruneisen's ratio estimated from values of the thermal pressure and...
Topics: DTIC Archive, STANFORD RESEARCH INST MENLO PARK CA, *ALUMINUM, *EQUATIONS, *HALOCARBON PLASTICS,...
Finite difference for continuum mechanics codes are capable of providing solutions for the behavior of a wide range of materials under a variety of boundary and initial conditions. The key to obtaining accurate solutions lies in the fidelity of models used to describe the material's response to the strains imposed, i.e., its Equation of State (EOS). This report presents both the general EOS algorithms used in the CRALE 1 and 2D codes and several specific EOS models currently in use. A driver...
Topics: DTIC Archive, Schuster, Shel, TITAN CORP CHATSWORTH CA, *MATHEMATICAL MODELS, *CONTINUUM MECHANICS,...
This project has synthesized an innovative implicit finite element CFD algorithm to advance the computational simulation of inviscid and viscous compressible flows. This report details for the 3D Euler and NavierStokes equations an intrinsically infinite directional upstream formulation that rests on the mathematics and physics of multidimensional acoustics and convection. Based upon characteristic velocities, this formulation introduces the upstream bias directly at the differential...
Topics: DTIC Archive, Iannelli, Joe, TENNESSEE UNIV KNOXVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING,...