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in subjects: "Simulators"

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Use of Analog Computers for Simulating the Movement of Isotopes in Ecological Systems

No Description Available.

Date: January 24, 1962

Creator: Neel, R. B. & Olson, J. S.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Computer simulation of coal preparation plants. Part 2. User's manual. Final report

This report describes a comprehensive computer program that allows the user to simulate the performance of realistic coal preparation plants. The program is very flexible in the sense that it can accommodate any particular plant configuration that may be of interest. This allows the user to compare the performance of different plant configurations and to determine the impact of various modes of operation with the same configuration. In addition, the program can be used to assess the degree of c… more

Date: December 1, 1985

Creator: Gottfried, B. S. & Tierney, J. W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Sandia Laboratories hybrid computer and motion simulator facilities

Hybrid computer and motion simulator facilities at Sandia National Laboratories include an AD/FIVE-AD10-PDP11/60, an AD/FIVE-PDP11/45, an EAI7800-EAI640, an EAI580/TR48-Nova 800, and two Carco S-45OR-3/R-493A three-axis motion simulators. An EAI680 is used in the analog mode only. This report describes the current equipment.

Date: May 1, 1980

Creator: Curry, W. H. & French, R. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Six phase rectifier digital computer simulation

A digital computer program has been developed for the simulation of a six-pulse converter with a resistance-inductance load. The program calculates the time histories of the voltages and currents on both the ac and dc sides of the rectifier bridges. The grid delay angle is calculated in terms of the load current, supply voltage, and commutating reactance. The program is written in FORTRAN and is executable on the CDC7600 Plotted output of ten variables can be requested. This program is a prelim… more

Date: October 1, 1975

Creator: Miller, R. W. & Nichols, J. O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Vacuum system transient simulator and its application to TFTR

The vacuum system transient simulator (VSTS) models transient gas transport throughout complex networks of ducts, valves, traps, vacuum pumps, and other related vacuum system components. VSTS is capable of treating gas models of up to 10 species, for all flow regimes from pure molecular to continuum. Viscous interactions between species are considered as well as non-uniform temperature of a system. Although this program was specifically developed for use on the Tokamak Fusion Test Reactor (TFTR… more

Date: January 1, 1977

Creator: Sredniawski, J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Nuclear power plant simulation facility evaluation methodology

A methodology for evaluation of nuclear power plant simulation facilities with regard to their acceptability for use in the US Nuclear Regulatory Commission (NRC) operator licensing exam is described. The evaluation is based primarily on simulator fidelity, but incorporates some aspects of direct operator/trainee performance measurement. The panel presentation and paper discuss data requirements, data collection, data analysis and criteria for conclusions regarding the fidelity evaluation, and … more

Date: January 1, 1985

Creator: Haas, P.M.; Carter, R.J. & Laughery, K.R. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Four-wheel-drive powertrain models for real-time simulation

Dynamic vehicle powertrain models have been formulated by many researchers for particular applications, mainly the analysis of powertrain characteristics or vibration. In this paper, we formulate models of four-wheel-drive vehicle powertrains for the purpose of real-time simulation. While not encompassing the complete characteristics of powertrain operation, these models are applicable for use in vehicle simulators, and include both the differential and lock-up modes of four-wheel-drive transfe… more

Date: January 1, 1991

Creator: Freeman, J.S. (Los Alamos National Lab., NM (United States)) & Velinsky, S.A. (California Univ., Davis, CA (United States). Dept. of Mechanical Engineering)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Investigations of entrainment mortality among larval and juvenile fishes using a Power Plant Simulator

A Power Plant Simulator (PPS) was constructed at the Oak Ridge National Laboratory to examine the component sources of entrainment mortality. This experimental apparatus circulates temperature-controlled water through a closed loop consisting of a pump, a condenser bundle, and vertically adjustable piping. Larval bluegill, channel catfish, carp, largemouth bass, and smallmouth bass and juvenile bluegill and mosquitofish were exposed to different combinations of pump speed and water temperatures… more

Date: January 1, 1980

Creator: Cada, G. F.; Suffern, J. S.; Kumar, K. D. & Solomon, J. A.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Analytical modeling techniques for efficient heat transfer simulation in nuclear power plant transients

New integral methods are formulated which are suitable for efficient computer simulation of thermal conduction and convective heat transfer in large engineering systems such as nuclear power plants. The methods described here have been shown to produce, in a special-purpose minicomputer for complex system simulations, extremely high simulation speed and accuracy which is commensurate with that of instrumentation. 11 refs., 3 figs.

Date: January 1, 1985

Creator: Wulff, W.; Cheng, H.S. & Mallen, A.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Reservoir performance in viscoelastic porous media

The mass balance equations for a two-phase two-component fluid system are written for viscoelastic porous media. The resulting equations are approximated by finite differences and the resulting numerical simulator is used to conduct a sensitivity study on the effects of uniaxial viscoelastic deformation in geopressured aquifers. Results of this study indicate that viscoelastic deformation may have considerable influence on the pressure maintenance of these aquifers. A numerical model of the geo… more

Date: January 1, 1982

Creator: Rago, F. M.; Ohkuma, H.; Sepehrnoori, K. & Thompson, T.W.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Nuclear power plant training simulator fidelity assessment

The fidelity assessment portion of a methodology for evaluating nuclear power plant simulation facilities in regard to their appropriateness for conducting the Nuclear Regulatory Commission's operating test was described. The need for fidelity assessment, data sources, and fidelity data to be collected are addressed. Fidelity data recording, collection, and analysis are discussed. The processes for drawing conclusions from the fidelity assessment and evaluating the adequacy of the simulator con… more

Date: January 1, 1985

Creator: Carter, R.J. & Laughery, K.R.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

High-speed BWR power plant simulations on the special-purpose peripheral processor AD10

A newly developed technique is described for fast, on-line simulations of normal and accidental transients in nuclear power plants. The technique is based on the utilization of the special-purpose peripheral processor ADlO, which is specifically designed for high-speed systems simulations through integration of large systems of nonlinear ordinary differential equations. The Peach Bottom-II Boiling Water Reactor power plant has been simulated and results are presented. It is shown that the new t… more

Date: January 1, 1984

Creator: Wulff, W.; Cheng, H.S.; Lekach, S.V. & Mallen, A.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Modeling Wettability Alteration using Chemical EOR Processes in Naturally Fractured Reservoirs

The objective of our search is to develop a mechanistic simulation tool by adapting UTCHEM to model the wettability alteration in both conventional and naturally fractured reservoirs. This will be a unique simulator that can model surfactant floods in naturally fractured reservoir with coupling of wettability effects on relative permeabilities, capillary pressure, and capillary desaturation curves. The capability of wettability alteration will help us and others to better understand and predict… more

Date: September 30, 2007

Creator: Delshad, Mojdeh; Pope, Gary A. & Sepehrnoori, Kamy

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Framework to Design and Optimize Chemical Flooding Processes

The goal of this proposed research is to provide an efficient and user friendly simulation framework for screening and optimizing chemical/microbial enhanced oil recovery processes. The framework will include (1) a user friendly interface to identify the variables that have the most impact on oil recovery using the concept of experimental design and response surface maps, (2) UTCHEM reservoir simulator to perform the numerical simulations, and (3) an economic model that automatically imports th… more

Date: August 31, 2006

Creator: Delshad, Mojdeh; Pope, Gary A. & Sepehrnoori, Kamy

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geotechnical, Hydrogeologic and Vegetation Data Package for 200-UW-1 Waste Site Engineered Surface Barrier Design

Fluor Hanford (FH) is designing and assessing the performance of engineered barriers for final closure of 200-UW-1 waste sites. Engineered barriers must minimize the intrusion and water, plants and animals into the underlying waste to provide protection for human health and the environment. The Pacific Northwest National Laboratory (PNNL) developed Subsurface Transport Over Multiple Phases (STOMP) simulator is being used to optimize the performance of candidate barriers. Simulating barrier perf… more

Date: November 26, 2007

Creator: Ward, Andy L.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of a Numerical Simulator for Analyzing the Geomechanical Performance of Hydrate-Bearing Sediments

In this paper, we describe the development and application of a numerical simulator that analyzes the geomechanical performance of hydrate-bearing sediments, which may become an important future energy supply. The simulator is developed by coupling a robust numerical simulator of coupled fluid flow, hydrate thermodynamics, and phase behavior in geologic media (TOUGH+HYDRATE) with an established geomechanical code (FLAC3D). We demonstrate the current simulator capabilities and applicability for … more

Date: June 1, 2008

Creator: Rutqvist, Jonny; Rutqvist, J. & Moridis, G.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Numerical modeling of water injection into vapor-dominatedgeothermal reservoirs

Water injection has been recognized as a powerful techniquefor enhancing energy recovery from vapor-dominated geothermal systemssuch as The Geysers. In addition to increasing reservoir pressures,production well flow rates, and long-term sustainability of steamproduction, injection has also been shown to reduce concentrations ofnon-condensible gases (NCGs) in produced steam. The latter effectimproves energy conversion efficiency and reduces corrosion problems inwellbores and surface lines.This r… more

Date: November 6, 2006

Creator: Pruess, Karsten

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

User information for WinGridder Version 3.0

WINGRIDDER V3.0 is a Windows-based software for designing and generating numerical grids for numerical simulators that are based on the"integral finite difference" or the"control volume" numerical scheme (e.g., TOUGH2, Pruess et al., 1996). The user can design and generate grid that properly represents the stratigraphic features, inclined faults, and repository. WINGRIDDER V3.0 is an upgrade from WINGRIDDER V2.0. This revision includes testable requirements as listed in the … more

Date: June 12, 2007

Creator: Pan, Lehua & Pan, Lehua

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Experimental Investigation and High Resolution Simulation of In-Situ Combustion Processes

This final technical report describes work performed for the project 'Experimental Investigation and High Resolution Numerical Simulator of In-Situ Combustion Processes', DE-FC26-03NT15405. In summary, this work improved our understanding of in-situ combustion (ISC) process physics and oil recovery. This understanding was translated into improved conceptual models and a suite of software algorithms that extended predictive capabilities. We pursued experimental, theoretical, and numerical tasks … more

Date: April 30, 2008

Creator: Gerritsen, Margot & Kovscek, Tony

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Wellbore Models GWELL, GWNACL, and HOLA User's Guide

This report describes three multi-component, multi-feedzone geothermal wellbore simulators developed. These simulators reproduce the measured flowing temperature and pressure profiles in flowing wells and determine the relative contribution, fluid properties (e.g. enthalpy, temperature) and fluid composition (e.g. CO{sub 2}, NaCl) of each feedzone for a given discharge condition. The three related wellbore simulators that will be discussed here are HOLA, GWELL and GWNACL. HOLA is a multi-feedzo… more

Date: October 1, 1991

Creator: Aunzo, Z.P.; Bjornsson, G. & Bodvarsson, G.S.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Performance of an MPI-only semiconductor device simulator on a quad socket/quad core InfiniBand platform.

This preliminary study considers the scaling and performance of a finite element (FE) semiconductor device simulator on a capacity cluster with 272 compute nodes based on a homogeneous multicore node architecture utilizing 16 cores. The inter-node communication backbone for this Tri-Lab Linux Capacity Cluster (TLCC) machine is comprised of an InfiniBand interconnect. The nonuniform memory access (NUMA) nodes consist of 2.2 GHz quad socket/quad core AMD Opteron processors. The performance result… more

Date: January 1, 2009

Creator: Shadid, John Nicolas & Lin, Paul Tinphone

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A Coupled Model for Natural Convection and Condensation in HeatedSubsurface Enclosures Embedded in Fractured Rock

In heated tunnels such as those designated for emplacementof radioactive waste at Yucca Mountain, axial temperature gradients maycause natural convection processes that can significantly influence themoisture conditions in the tunnels and in the surrounding fractured rock.Large-scale convection cells would provide an effective mechanism foraxial vapor transport, driving moisture out of the formation away fromthe heated tunnel section into cool end sections (where no waste isemplaced). To study … more

Date: April 14, 2006

Creator: Halecky, N.; Birkholzer, J. T.; Webb, S. W.; Peterson, P. F. & Bodvarsson, G. S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Efficient parallel simulation of CO2 geologic sequestration insaline aquifers

An efficient parallel simulator for large-scale, long-termCO2 geologic sequestration in saline aquifers has been developed. Theparallel simulator is a three-dimensional, fully implicit model thatsolves large, sparse linear systems arising from discretization of thepartial differential equations for mass and energy balance in porous andfractured media. The simulator is based on the ECO2N module of the TOUGH2code and inherits all the process capabilities of the single-CPU TOUGH2code, including a … more

Date: January 1, 2007

Creator: Zhang, Keni; Doughty, Christine; Wu, Yu-Shu & Pruess, Karsten

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Real Time RF Simulator (RTS) and control

The multi-cavity RTS allows LLRF algorithm development and lab testing prior to commissioning with real cavities and cryomodules. The RTS is a valuable tool since it models the functions, errors and disturbances of real RF systems. The advantage of a RTS over an off-line simulator is that it can be implemented on the actual LLRF hardware, on the same FPGA and processor, and run at the same speed of the LLRF control loop. Additionally the RTS can be shared by collaborators who do not have access… more

Date: October 1, 2008

Creator: Cancelo, G.; Armiento, C.; Treptow, K.; Vignoni, A. & Zmuda, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department