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Fully-Coupled Solution of Pressure-Linked Fluid-Flow Equations
A robust and efficient numerical scheme has been developed for the solution of the finite-differenced pressure linked fluid flow equations. The algorithm solves the set of nonlinear simultaneous equations by a combination of Newton's method and efficient sparse matrix techniques. In tests on typical recirculating flows the method is rapidly convergent. The method does not require any under-relaxation or other convergence-enhancing techniques employed in iterative schemes. It is currently described for two-dimensional steady state flows but is extendible to three dimensions and mildly time-varying flows. The method is robust to changes in Reynolds number, grid aspect ratio, and mesh size. This paper reports the algorithm and the results of calculations performed.
Date:
August 1983
Creator:
Vanka, S. P. & Leaf, G. K.
System:
The UNT Digital Library
Comparison of REXCO Code Predictions with SRI SM-2 Experimental Results
This report deals with the REXCO-code predictions of the SRI SM-2 test. Two calculations were performed with the REXCO-HEP code: one used the pressure history of the core detonation products as input and the other the pressure-volume relations of the detonation products as input. The other inputs of the computer analysis are the vessel and the core-barrel dimensions and boundary conditions, the constitutive equations of the vessel and the core barrel materials, and the equation of state for the coolant. The REXCO-predicted well deformations, pressure loadings, and dynamic strain histories at various gauge positions are compared with the experimental data. Results of the comparisons are discussed.
Date:
August 1978
Creator:
Chang, Y. W. & Gvildys, J.
System:
The UNT Digital Library
COMMIX-PPC. a Three-Dimensional Transient Multicomponent Computer Program for Analyzing Performance of Power Plant Condensers
The COMMIX-PPC computer program 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 conservation of mass, momentum, and energy equations on the tube side, and the proper accounting for the thermal interaction between shell and tube side through the porous medium approach. The other added feature is the extension of the three-dimensional conservation equations for shell-side flow to treat the flow of a multicomponent medium. COMMIX-PPC is designed to perform steady-state and transient three-dimensional analysis of fluid flow with heat transfer in a power plant condenser. However, the code is designed in a generalized fashion so that, with some modification, it can be used to analyze processes in any heat exchanger or other single-phase engineering applications.
Date:
August 1991
Creator:
Chien, T. H.; Domanus, H. M. & Sha, William T.
System:
The UNT Digital Library
Studying Parallel Program Behavior with Upshot
This is a description of and a user's manual for upshot, an X-based graphics tool for viewing log files produced by parallel programs.
Date:
August 1991
Creator:
Herrarte, Virginia & Lusk, Ewing
System:
The UNT Digital Library
Research in Mathematics and Computer Science at Argonne : September 1989 - February 1991
This report reviews the research activities in the Mathematics and Computer Science Division at Argonne National Laboratory for the period September 1989 through February 1991. The body of the report gives a brief look at the MCS staff and the research facilities and then discusses the diverse research projects carried out in the division. Projects funded by non-DOE sources are also discussed, and new technology transfer activities are described. Further information on staff, visitors, workshops, and seminars is found in the appendixes.
Date:
August 1991
Creator:
Pieper, Gail W.
System:
The UNT Digital Library
The Application of Automated Reasoning to Proof Translation and to Finding Proofs with Specified Properties: a Case Study in Many-Valued Sentential Calculus
In both mathematics and logic, many theorems exist such that each can be proved in entirely different ways. For a striking example, there exist theorems from group theory that can be proved by relying solely on equality and (from the viewpoint of automated reasoning) the use of paramodulation, but can also be proved in a notation in which equality is totally absent and the inference rule is condensed detachment (captured with a single clause and the rule hyper-resolution). A study of such examples immediately shows how far from obvious is the problem of producing a proof in one system even in the presence of a proof in another; such problems can be viewed as ones of translation, where the rules of translation and the translation itself are frequently difficult to obtain. In this report, we discuss in detail various techniques that can be applied by the automated reasoning program OTTER to address the translation problem to obtain a proof in one notation and inference system given a proof in a completely different notation and inference system. To illustrate the techniques, we present a full treatment culminating in a successful translation'' of a proof of a theorem from many-valued sentential calculus. …
Date:
August 1991
Creator:
Wos, Larry & McCune, William W.
System:
The UNT Digital Library
Nuclear Technology Programs Semiannual Progress Report: April-September 1989
Progress report of the Argonne National Laboratory's Nuclear Technology Programs involving R&D in three areas: applied physical chemistry, separation science and technology, and nuclear waste management.
Date:
August 1991
Creator:
Steindler, M. J.; Battles, J. E. & Harmon, J. E.
System:
The UNT Digital Library
Proceedings of the Focused Research Program on Spectral Theory and Boundary Value Problems, Vol. 4: Nonlinear Differential Equations
Report on the asymptotic behavior of certain generalized solutions of the problem of the prescribed mean curvature equation.
Date:
August 1989
Creator:
Kaper, H. G.; Kwong, Man Kam & Zettl, Anton
System:
The UNT Digital Library
A Review of Two-Phase Flow-Induced Vibration
Two-phase flow exists in many shell-and-tube heat exchangers and power generation components. The flowing fluid is a source of energy that can induce small-amplitude subcritical oscillations and large-amplitude dynamic instabilities. In fact, many practical system components have experienced excessive flow-induced vibrations. To prevent unacceptable flow-induced vibration, we must understand excitation mechanisms, develop analytical and experimental techniques, and provide reliable design guidelines. Thus, we are conducting a comprehensive program to study structural vibration in components subjected to two-phase flow. This report reviews the current understanding of vibration of circular cylinders in quiescent fluid, cross-flow, and axial flow, with emphasis on excitation mechanisms, mathematical models, and available experimental data. A unified theory is presented for cylinders oscillating under different flow conditions. Based on the theory, future research needs are outlined.
Date:
August 1987
Creator:
Chen, Shoei-Sheng
System:
The UNT Digital Library
A Review of Parameterizations of Microphysical Processes in Clouds for Application in Models of Regional Atmospheric Deposition
The literature on parameterizations of cloud microphysical processes was reviewed to examine the theoretical bases of those parameterizations and to evaluate their applicability to regional models. New parameterizations were produced by multiple regression upon the solution fields derived from simulations of a cloud model incorporating sophisticated microphysics. The currently available rates for cloud microphysical interactions were generally derived under the assumption that the size distribution functions for various hydrometeors are given. Such parameterizations must therefore be applied with caution because the spectral evolution of various types of hydrometeors in reality varies significantly during the stages of cloud development. Uncertainties exist in assigning values for aerodynamic properties such as the bulk collection efficiency, and the growth processes for various types of ice crystals are not well enough known for accurate multiphase cloud-microphysics parameterizations. The new parameterizations, in general, compare favorably with those currently available and are more efficient and applicable to regional models. The largest discrepancies occur in the autoconversion rates, whereas the accretion rates agree closely when the assumed collection efficiencies in other formulas are smaller than unity.
Date:
August 1987
Creator:
Lee, L. Y. & Hong, M. S.
System:
The UNT Digital Library
Weight Losses of Marble and Limestone Briquettes Exposed to Outdoor Environments in the Eastern United States
Weight losses of marble and limestone samples exposed to outdoor environments at field sites in the eastern United States have been monitored in studies initiated in 1984. The procedures are described, and the results are tabulated and discussed. A rate of marble loss approximately equivalent to 16 micrometers of surface recession per year was found in North Carolina, and losses of this order were also observed in New Jersey, New York, and Washington, DC. Limestone weight losses were much higher than for marble in the first year; loss of extraneous materials from the porous limestone appeared to be a likely contributor to the overall loss. The rate of limestone loss diminished in the second year, though it continued to be higher than for marble. Exposures are continuing in a planned 10-yr program of tests.
Date:
August 1987
Creator:
Youngdahl, C. A.
System:
The UNT Digital Library
Reformers for the Production of Hydrogen from Methanol and Alternative Fuels for Fuel Cell Powered Vehicles
The objective of this study was (i) to assess the present state of technology of reformers that convert methanol (or other alternative fuels) to a hydrogen-rich gas mixture for use in a fuel cell, and (ii) to identify the R & D needs for developing reformers for transportation applications. Steam reforming and partial oxidation are the two basic types of fuel reforming processes. The former is endothermic while the latter is exothermic. Reformers are therefore typically designed as heat exchange systems, and the variety of designs used includes shell-and-tube, packed bed, annular, plate, and cyclic bed types. Catalysts used include noble metals and oxides of Cu, Zn, Cr, Al, Ni, and La. For transportation applications a reformer must be compact, lightweight, and rugged. It must also be capable of rapid start-up and good dynamic performance responsive to fluctuating loads. A partial oxidation reformer is likely to be better than a steam reformer based on these considerations, although its fuel conversion efficiency is expected to be lower than that of a steam reformer. A steam reformer better lends itself to thermal integration with the fuel cell system; however, the thermal independence of the reformer from the fuel cell stack is likely …
Date:
August 1992
Creator:
Kumar, R.; Ahmed, S.; Krumpelt, Michael & Myles, K. M.
System:
The UNT Digital Library
Technology Development Goals for Automotive Fuel Cell Power Systems : Final Report, Contract No. 22822402
This report determines cost and performance requirements for Proton Exchange Membrane (PEM) fuel cell vehicles carrying pure hydrogen fuel, to achieve parity with internal combustion engine (ICE) vehicles.
Date:
August 1994
Creator:
James, Brian D.; Baum, George N. & Kuhn, Ira F., Jr.
System:
The UNT Digital Library
Users Manual for KSP Data-Structure-Neutral Codes Implementing Krylov Space Methods
The combination of a Krylov space method and a pre-conditioner is at the heart of most modern numerical codes for the iterative solution of linear systems. This document contains both a users manual and a description of the implementation for the Krylov space methods package KSP included as part of the Portable, Extensible Tools for Scientific computation package (PETSc). PETSc is a large suite of data-structure-neutral libraries for the solution of large-scale problems in scientific computation, in particular on massively parallel computers. The methods in KSP are conjugate gradient method, GMRES, BiCG-Stab, two versions of transpose-free QMR, and others. All of the methods are coded using a common, data-structure-neutral framework and are compatible with the sequential, parallel, and out-of-core solution of linear systems. The codes make no assumptions about the representation of the linear operator; implicitly defined operators (say, calculated using differencing) are fully supported. In addition, unlike all other iterative packages we are aware of, the vector operations are also data-structure neutral. Once certain vector primitives are provided, the same KSP software runs unchanged using any vector storage format. It is not restricted to a few common vector representations. The codes described are actual working codes that run on …
Date:
August 1994
Creator:
Gropp, William & Smith, Barry
System:
The UNT Digital Library
Basic TRUEX Process for Rocky Flats Plant
The Generic TRUEX Model was used to develop a TRUEX process flowsheet for recovering the transuranics (plutonium, americium) from a nitrate waste stream at Rocky Flats Plant. T\
Date:
August 1994
Creator:
Leonard, R. A.; Chamberlain, D. B.; Dow, J. A.; Farley, S. E.; Nuñez, Luis; Regalbuto, M. C. et al.
System:
The UNT Digital Library
Actinide Recovery Using Aqueous Biphasic Extraction: Initial Developmental Studies
Aqueous biphasic extraction systems are being developed to treat radioactive wastes. The separation technique involves the selective partitioning of either solutes or colloid-size particles between two scible aqueous phases. Wet grinding of plutonium residues to an average particle size of one micron will be used to liberate the plutonium from the bulk of the particle matrix. The goal is to produce a plutonium concentrate that will integrate with existing and developing chemical recovery processes. Ideally, the process would produce a nonTRU waste stream. Coupling physical beneficiation with chemical processing will result in a substantial reduction in the volume of mixed wastes generated from dissolution recovery processes. As part of this program, we will also explore applications of aqueous biphasic extraction that include the separation and recovery of dissolved species such as metal ions and water-soluble organics. The expertise and data generated in this work will form the basis for developing more cost-effective processes for handling waste streams from environmental restoration and waste management activities within the DOE community. This report summarizes the experimental results obtained during the first year of this effort. Experimental efforts were focused on elucidating the surface and solution chemistry variables which govern partitioning behavior of plutonium …
Date:
August 1992
Creator:
Chaiko, David J.; Mensah-Biney, R.; Mertz, C. J. & Rollins, A. N.
System:
The UNT Digital Library
Programming in Fortran M
Fortran M is a small set of extensions to Fortran that supports a modular approach to the construction of sequential and parallel programs. Fortran M programs use channels to plug together processes which may be written in Fortran M or Fortran 77. Processes communicate by sending and receiving messages on channels. Channels and processes can be created dynamically, but programs remain deterministic unless specialized nondeterministic constructs are used. Fortran M programs can execute on a range of sequential, parallel, and networked computers. This report incorporates both a tutorial introduction to Fortran M and a users guide for the Fortran M compiler developed at Argonne National Laboratory. The Fortran M compiler, supporting software, and documentation are made available free of charge by Argonne National Laboratory, but are protected by a copyright which places certain restrictions on how they may be redistributed. See the software for details. The latest version of both the compiler and this manual can be obtained by anonymous ftp from Argonne National Laboratory in the directory pub/fortran-m at info.mcs.anl.gov.
Date:
August 1993
Creator:
Foster, Ian; Olson, Robert & Tuecke, Steven
System:
The UNT Digital Library
Fortran M Language Definition
This document defines the Fortran M extensions to Fortran 77. It updates an earlier definition, dated June 1992, in several minor respects.
Date:
August 1993
Creator:
Foster, Ian & Chandy, K. Mani
System:
The UNT Digital Library
Control Rods in LMFBRs: A Physics Assessment
This physics assessment is based on roughly 300 control rod worth measurements in ZPPR from 1972 to 1981. All ZPPR assemblies simulated mixed-oxide LMFBRs, representing sizes of 350, 700, and 900 MWe. Control rod worth measurements included single rods, various combinations of rods, and tantalum and europium rods. Additional measurements studied variations in B4C enrichment, rod interaction effects, variations in rod geometry, neutron streaming in sodium-filled channels, and axial worth profiles. Analyses were done with design-equivalent methods, using ENDF/B Version IV data. Some computations for the sensitivities to approximations in the methods have been included. Comparisons of these analyses with the experiments have allowed the status of control rod physics in the US to be clearly defined.
Date:
August 1982
Creator:
McFarlane, Harold F. & Collins, P. J.
System:
The UNT Digital Library
JAKEF: A Portable Symbolic Differentiator of Functions Given by Algorithms
JAKEF is a compiler that accepts as data a single or double precision FORTRAN subroutine program defining an objective function F(x) or a vector function f(x) and produces as output a single or double precision FORTRAN program defining the gradient of F(x) or the Jacobian of f(x).
Date:
August 1982
Creator:
Hillstrom, Kenneth E.
System:
The UNT Digital Library
NDA Safeguards Techniques for LMFBR Assemblies
Report discussing safeguards for liquid-metal fast breeder reactors (LMFBFRs) and their fuel handling systems.
Date:
August 1982
Creator:
Persiani, P. J. & Gundy, M. L.
System:
The UNT Digital Library
Fuel Cycle Programs, Quarterly Progress Report: October-December 1982
Quarterly report of the Argonne National Laboratory Chemical Engineering Division regarding activities related to properties and handling of radioactive materials, operation of nuclear reactors, and other relevant research.
Date:
August 1983
Creator:
Steindler, M. J.; Bates, J. K.; Cannon, T. F.; Couture, R. A.; Deeken, P. G.; Fagan, J. E. et al.
System:
The UNT Digital Library
Lithium/Iron Sulfide Batteries for Electric-Vehicle Propulsion and Other Applications Progress Report for October 1979-March 1980
This report covers the research and development activities of the program at Argonne National Laboratory (ANL) on lithium/iron sulfide batteries during the period October 1979-March 1980.
Date:
August 1980
Creator:
Barney, Duane L.; Steunenberg, R. K.; Chilenskas, A. A.; Gay, E. C.; Battles, J. E.; Miller, W. E. et al.
System:
The UNT Digital Library
Division of Biological and Medical Research Annual Report 1980
The research during 1980 in the Division of Biological and Medical Research, Argonne National Laboratory, is summarized. Research related to nuclear energy includes the delineation, in the6 eagle, of the responses to continuous low level Co gamma radiation and the development of cellular indicators of preclinical phases of leukemia; comparison of lifetime effects in mice of low level neutron and Co gamma radiation.
Date:
August 1981
Creator:
Argonne National Laboratory. Division of Biological and Medical Research.
System:
The UNT Digital Library