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Operator overloading as an enabling technology for automatic differentiation

Description: We present an example of the science that is enabled by object-oriented programming techniques. Scientific computation often needs derivatives for solving nonlinear systems such as those arising in many PDE algorithms, optimization, parameter identification, stiff ordinary differential equations, or sensitivity analysis. Automatic differentiation computes derivatives accurately and efficiently by applying the chain rule to each arithmetic operation or elementary function. Operator overloading e… more
Date: January 1, 1993
Creator: Corliss, G.F. (Marquette Univ., Milwaukee, WI (United States) Argonne National Lab., IL (United States)) & Griewank, A. (Argonne National Lab., IL (United States))
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Partner: UNT Libraries Government Documents Department
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Fin-efficiency calculation for condensation in the presence of noncondensable gases

Description: Plate-fin heat exchangers are being considered for many condenser applications. They are commonly used for the gas-separation process because they can provide a high thermal performance to obtain a low mean-temperature difference, essential for the gas-separation process. Plate-fin heat exchangers are also considered for the heat-pump system using nonazeotropic refrigerant mixtures. The brazed plate-fin condenser was considered to be a leading candidate for the Ocean Thermal Energy Conversion (… more
Date: January 1, 1993
Creator: Panchal, C.B.
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Partner: UNT Libraries Government Documents Department
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Chaotic vibration in fluidelastic instability of a tube row in crossflow

Description: Chaotic motions with complicated orbits make the prediction of wear between heat exchanger tubes and tube support plates difficult. To unravel the chaotic motions of nonlinearly supported tubes caused by the fluidelastic instability, an analytical investigation based on unsteady flow theory was conducted. The analytical model consists of a row of rigid tubes with three flexible tubes supported by elastic springs. This simplified model enables the study of the fluidelastic coupling effects of lo… more
Date: January 1, 1993
Creator: Chen, S.H. & Chen, S.S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Appendix SET-TMP-PT of the Experiment Operating Specification for the Savannah River One-Fourth Linear Scale, One-Sixth Sector, Tank/Muff/Pump (TMP) Separate Effects Tests (SET) experiment series

Description: The Savannah River One-Fourth Linear Scale, One-Sixth Sector, Tank-Muff-Pump (TMP) Separate Effects Tests (SET) are being conducted by the Idaho National Engineering Laboratory to investigate Savannah River Site (SRS) production reactor tank, muff, pump suction, and pump hydraulic response phenomena for large break loss-of-coolant accident (LBLOCA) scenarios. The test series consists of experiments representing a range of hydraulic conditions and geometries which bound those anticipated for LBL… more
Date: May 1, 1993
Creator: Bollinger, J. S.; Anderson, J. L.; Boucher, T. J. & Sterrett, J. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Numerical modeling of injection experiments at The Geysers

Description: Data from injection experiments in the southeast Geysers are presented that show strong interference (both negative and positive) with a neighboring production well. Conceptual and numerical models are developed that explain the negative interference (decline of production rate) in terms of heat transfer limitations and water-vapor relative permeability effects. Recovery and over-recovery following injection shut-in are attributed to boiling of injected fluid, with heat of vaporization provided… more
Date: January 1, 1993
Creator: Pruess, K. (Lawrence Berkeley Lab., CA (United States)) & Enedy, S. (Northern California Power Agency, Middletown, CA (United States))
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Partner: UNT Libraries Government Documents Department
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Estimate of LOCA-FI plenum pressure uncertainty for a five-ring RELAP5 production reactor model

Description: The RELAP5/MOD2.5 code (RELAP5) is used to perform best-estimate analyses of certain postulated Design Basis Accidents (DBAs) in SRS production reactors. Currently, the most limiting DBA in terms of reactor power level is an instantaneous double-ended guillotine break (DEGB) loss of coolant accident (LOCA). A six-loop RELAP5 K Reactor model is used to analyze the reactor system behavior dozing the Flow Instability (FI) phase of the LOCA, which comprises only the first 5 seconds following the DE… more
Date: March 1, 1993
Creator: Griggs, D. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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High flux film and transition boiling

Description: An investigation was conducted on the potential for altering the boiling curve through effects of high velocity and high subcooling. Experiments using water and Freon-113 flowing over cylindrical electrical heaters in crossflow were made to see how velocity and subcooling affect the boiling curve, especially the film and transition boiling regions. We sought subcooling levels down to near the freezing points of these two liquids to prove the concept that the critical heat flux and the minimum h… more
Date: February 1, 1993
Creator: Witte, L.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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[The physics of pattern formation of liquid interfaces]

Description: Energy consumption in fabrication of materials for all applications is process dependent. Improvements in the ability to process materials are of great importance to the DOE mission. This project addresses basic science questions related to the processing of materials and is aimed at understanding growth of interfaces and evolution of patterns on interfaces, both macroscopic and microscopic. Three laboratory experiments are proposed: A study of the changes in patterns available to the growth of… more
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fluid dynamical predictions for Au+Au collisions at AGS

Description: Signatures of collective effects are studied in the Quark Gluon String Model and in the Fluid Dynamical Model for Au [plus] Au collisions at 11.6 A GeV. In the fluid dynamical model the dependence of measurables on the QGP formation in the EOS is pointed out, although the max. total amount of pure QGP formed is only 4 fm[sup 3] in these reactions. In QGSM the lifetime and extent of latent energy in strings is studied.
Date: January 1, 1993
Creator: Bravina, L.; Csernai, L.P. (Bergen Univ. (Norway). Dept. of Physics); Levai, P. (Bergen Univ. (Norway). Dept. of Physics Hungarian Academy of Sciences, Budapest (Hungary). Central Research Inst. for Physics) & Strottmam, D. (Los Alamos National Lab., NM (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Columbia River monitoring: Distribution of tritium in Columbia River water at the Richland Pumphouse

Description: The Surface Environmental Surveillance Project (SESP) is conducted by the Pacific Northwest Laboratory (PNL) for the US Department of Energy (DOE). This report presents the results of a special study conducted as part of the SESP to supplement the routine Columbia River monitoring program and provide information relative to the dispersion and distribution of Hanford origin contaminants entering the river through the seepage of ground water along the Hanford Site. Sampling was conducted along cr… more
Date: February 1, 1993
Creator: Dirkes, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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COMMIX-PPC: A three-dimensional transient multicomponent computer program for analyzing performance of power plant condensers

Description: The COMMIX-PPC computer pregrain is an extended and improved version of earlier COMMIX codes and is specifically designed for evaluating the thermal performance of power plant condensers. The COMMIX codes are general-purpose computer programs for the analysis of fluid flow and heat transfer in complex Industrial systems. In COMMIX-PPC, two major features have been added to previously published COMMIX codes. One feature is the incorporation of one-dimensional equations of conservation of mass, m… more
Date: February 1, 1993
Creator: Chien, T. H.; Domanus, H. M. & Sha, W. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lattice Gas Hydrodynamics: Theory and Simulations

Description: The first successful application of a microscopic analogy to create a skeleton cellular automaton and analyze it with statistical mechanical tools, was the work of Frisch, Hasslacher and Pomeau on the Navier-Stokes equation in two and three dimensions. This has become a very large research area with lattice gas models and methods being used for both fundamental investigations into the foundations of statistical mechanics and a large number of diverse applications. This present research was devo… more
Date: January 1, 1993
Creator: Hasslacher, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Annual report on monitoring of the unsaturated zone and recharge areas at INEL to the state of Idaho INLEL Oversight COmmittee

Description: This project, begun in March 1991, was originally structured as two separate research efforts: An investigation of the recharge phenomenon and surface water-ground water interactions at the INEL; and a study of water and contaminant movement through the unsaturated zone, including a review of computer models used to described this process. During the initial months of work, it became obvious to those involved in these studies that the two topic areas were intimately related, and work since that… more
Date: March 1, 1993
Creator: Horn, D.; Liou, J. & Finnie, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Capillary effects in drainage in heterogeneous porous media: Continuum modeling, experiments and pore network simulations

Description: We investigate effects of capillary heterogeneity induced by variations in permeability in the direction of displacement in heterogeneous porous media under drainage conditions. The investigation is three-pronged and uses macroscopic simulation, based on the standard continuum equations, experiments with the use of an acoustic technique and pore network numerical models. It is found that heterogeneity affects significantly the saturation profiles, the effect being stronger at lower rates. A goo… more
Date: April 1, 1993
Creator: Xu, Baomin & Yortsos, Y.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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United States Gulf Coast Geopressured-Geothermal Program, Consolidated Research Program

Description: During the last quarter, work has focused on developing a numerical model to. approximate the flow characteristics of the Gladys McCall reservoir. Various reservoir models have been used in the study to simulate the well transient pressure and pressure derivative behavior during the reservoir production period. The pressure behavior of the 1983 Reservoir Limits Test (RLT) was closely matched by an elongated linear reservoir model with the well located off-center. The matching procedure appears … more
Date: January 21, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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1/12-scale physical modeling experiments in support of tank 241-SY- 101 hydrogen mitigation

Description: Hanford tank 241-SY-101 is a 75-ft-dia double-shell tank that contains approximately 1.1 M gal of radioactive fuel reprocessing waste. Core samples have shown that the tank contents are separated into two main layers, a article laden supernatant liquid at the top of the tank and a more dense slurry on the bottom. Two additional layers may be present, one being a potentially thick sludge lying beneath the slurry at the bottom of the tank and the other being the crust that has formed on the surfa… more
Date: January 1, 1993
Creator: Fort, J. A.; Bamberger, J. A.; Bates, J. M.; Enderlin, C. W. & Elmore, M. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heating 7. 2 user's manual

Description: HEATING is a general-purpose conduction heat transfer program written in Fortran 77. HEATING can solve steady-state and/or transient heat conduction problems in one-, two-, or three-dimensional Cartesian, cylindrical, or spherical coordinates. A model may include multiple materials, and the thermal conductivity, density, and specific heat of each material may be both time- and temperature-dependent. The thermal conductivity may also be anisotropic. Materials may undergo change of phase. Thermal… more
Date: February 1, 1993
Creator: Childs, K.W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Supercritical waste oxidation pump investigation

Description: This report investigates the pumping techniques and pumping equipment that would be appropriate for a 5,000 gallon per day supercritical water oxidation waste disposal facility. The pumps must boost water, waste, and additives from atmospheric pressure to approximately 27.6 MPa (4,000 psia). The required flow ranges from 10 gpm to less than 0.1 gpm. For the higher flows, many commercial piston pumps are available. These pumps have packing and check-valves that will require periodic maintenance;… more
Date: February 1, 1993
Creator: Thurston, G. & Garcia, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Towards a better hydro for dynamic mix calculations

Description: A difference equation technique suitable for clean, dynamic mix, and turbulence Lagrangian calculations is shown. This new technique is compared to the standard one for clean one-dimensional calculations of the Noh, Sedov Blast Wave, and Strong Shock Tube test problems, and for a one-dimensional two-phase flow dynamic mix calculation of a modified Noh problem, all test problems involving shocks. The new technique is shown to dramatically reduce the noise in the calculated hydrodynamic quantitie… more
Date: January 1, 1993
Creator: Binstock, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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[Laser spectroscopy of hydrocarbon radicals]

Description: Several hydrocarbon reactive intermediates (carbenes, biradicals, etc.) were prepared in a supersonic jet expansion. heats of formation were determined for the isosmeric C[sub 3]H[sub 2] carbenes. Fits were made to the photoelectron spectra of c-C[sub 3]H[sub 2] and c- C[sub 4]H[sub 4]. Resonant MPI (multi-photon ionization ) spectra were obtained for allyl radical and its deuterated isotopomers.
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Velocity measurements of low Reynolds number tube flow using fiber-optic technology

Description: In 1988 Nielsen started work to measure the spatial variability of the mass flux vector being transported in a porous medium. To measure the spatial variability of the mass flux vector, the spatial variability of its components(velocity, concentration) must be measured. Nielsen was successful in measuring the pore level concentration at many different pores and in verifying the assumption that a nonuniform concentration field exists within the mixing zone between two miscible fluids. However, N… more
Date: March 1, 1993
Creator: Bianchi, J.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Simulation of unsaturated flow and nonreactive solute transport in a heterogeneous soil at the field scale

Description: A field-scale, unsaturated flow and solute transport experiment at the Las Cruces trench site in New Mexico was simulated as part of a blind'' modeling exercise to demonstrate the ability or inability of uncalibrated models to predict unsaturated flow and solute transport in spatially variable porous media. Simulations were conducted using a recently developed multiphase flow and transport simulator. Uniform and heterogeneous soil models were tested, and data from a previous experimen… more
Date: February 1, 1993
Creator: Rockhold, M L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flow visualization and relative permeability measurements in rough-walled fractures

Description: Two-phase (gas-liquid) flow experiments were done in a natural rock fracture and transparent replicas of natural fractures. Liquid was injected at constant volume flow rate, and gas was injected at either constant mass flow rate or constant pressure. When gas was injected at constant mass flow rate, the gas inlet pressure, and inlet and outlet capillary pressures, generally did not reach steady state but cycled irregularly. Flow visualization showed that this cycling was due to repeated blockin… more
Date: January 1, 1993
Creator: Persoff, P. & Pruess, K.
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Partner: UNT Libraries Government Documents Department
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Experimental study of instability growth patterns of a shock- accelerated, thin fluid layer

Description: We have discovered a remarkable set of flow patterns induced by shock acceleration of two nearby, perturbed interfaces. Using planar laser-induced fluorescence (PLIF), we observe three distinct patterns in the nonlinear evolution of Richtmyer-Meshkov (RM) instabilities associated with this flow. We observe two patterns dominated by vortex pairs and one pattern showing no vortex pairing (until late time) for initial conditions that are indistinguishable by measurement techniques available for ou… more
Date: January 1, 1993
Creator: Jacobs, J.W. (Arizona Univ., Tucson, AZ (United States). Dept. of Aerospace and Mechanical Engineering); Jenkins, D.G.; Klein, D.L. & Benjamin, R.F. (Los Alamos National Lab., NM (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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