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Modeling Complex Forest Ecology in a Parallel Computing Infrastructure

Description: Effective stewardship of forest ecosystems make it imperative to measure, monitor, and predict the dynamic changes of forest ecology. Measuring and monitoring provides us a picture of a forest's current state and the necessary data to formulate models for prediction. However, societal and natural events alter the course of a forest's development. A simulation environment that takes into account these events will facilitate forest management. In this thesis, we describe an efficient parallel imp… more
Date: August 2003
Creator: Mayes, John
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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COLLABORATIVE: FUSION SIMULATION PROGRAM

Description: New York University, Courant Institute of Mathematical Sciences, participated in the “Fusion Simulation Program (FSP) Planning Activities” [http://www.pppl.gov/fsp], with C.S. Chang as the institutional PI. FSP’s mission was to enable scientific discovery of important new plasma phenomena with associated understanding that emerges only upon integration. This requires developing a predictive integrated simulation capability for… more
Date: June 5, 2012
Creator: Chang, Choong Seock
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Co-simulation of innovative integrated HVAC systems in buildings

Description: Integrated performance simulation of buildings HVAC systems can help in reducing energy consumption and increasing occupant comfort. However, no single building performance simulation (BPS) tool offers sufficient capabilities and flexibilities to analyze integrated building systems and to enable rapid prototyping of innovative building and system technologies. One way to alleviate this problem is to use co-simulation, as an integrated approach to simulation. This article elaborates on issues im… more
Date: June 21, 2010
Creator: Trcka, Marija; Hensena, Jan L.M. & Wetter, Michael
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Energy Usage While Maintaining Thermal Comfort : A Case Study of a UNT Dormitory

Description: Campus dormitories for the University of North Texas house over 5500 students per year; each one of them requires certain comfortable living conditions while they live there. There is an inherit amount of money required in order to achieve minimal comfort levels; the cost is mostly natural gas for water and room heating and electricity for cooling, lighting and peripherals. The US Department of Energy has developed several programs to aid in performing energy simulations to help those interest… more
Date: December 2011
Creator: Gambrell, Dusten
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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PEBBLES Operation and Theory Manual

Description: The PEBBLES manual describes the PEBBLES code. The PEBBLES code is a computer program designed to simulation the motion, packing and vibration of spheres that undergo various mechanical forces including gravitation, Hooke’s law force and various friction forces. The frictional forces include true static friction that allows non-zero angles of repose. Each pebble is individually simulated using the distinct element method.
Date: February 1, 2011
Creator: Cogliati, Joshua J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

PEBBLES Operation and Theory Manual

Description: The PEBBLES manual describes the PEBBLES code. The PEBBLES code is a computer program designed to simulation the motion, packing and vibration of spheres that undergo various mechanical forces including gravitation, Hooke’s law force and various friction forces. The frictional forces include true static friction that allows non-zero angles of repose. Each pebble is individually simulated using the distinct element method.
Date: September 1, 2010
Creator: Cogliati, Joshua J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A View on Future Building System Modeling and Simulation

Description: This chapter presents what a future environment for building system modeling and simulation may look like. As buildings continue to require increased performance and better comfort, their energy and control systems are becoming more integrated and complex. We therefore focus in this chapter on the modeling, simulation and analysis of building energy and control systems. Such systems can be classified as heterogeneous systems because they involve multiple domains, such as thermodynamics, fluid d… more
Date: April 1, 2011
Creator: Wetter, Michael
Item Type: Refine your search to only Book
Partner: UNT Libraries Government Documents Department
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Exploring Undergraduate Nursing Students' Experiences with Interruptions: The Impact of Computer-Based Simulation on Their Knowledge and Satisfaction

Description: The purpose of this study was to evaluate the impact of computer-based simulation on prelicensure senior second semester undergraduate baccalaureate nursing students' knowledge and satisfaction. The goal was to explore the current state of nursing education in relation to the nursing student's experience with interruptions and interruption management as interruptions and interruption management are an underexplored area of the nursing education experience, yet interruptions impact nursing perfo… more
Date: May 2023
Creator: Otto, Lisa M.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

2-D Reflectometer Modeling for Optimizing the ITER Low-field Side Reflectometer System

Description: The response of a low-field side reflectometer system for ITER is simulated with a 2?D reflectometer code using a realistic plasma equilibrium. It is found that the reflected beam will often miss its launch point by as much as 40 cm and that a vertical array of receiving antennas is essential in order to observe a reflection on the low-field side of ITER.
Date: September 2, 2005
Creator: Kramer, G. J.; Nazikian, R.; Valeo, E. J.; Budny, R. V.; Kessel, C. & Johnson, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three-dimensional Simulation of Gas Conductance Measurement Experiments on Alcator C-Mod

Description: Three-dimensional Monte Carlo neutral transport simulations of gas flow through the Alcator C-Mod subdivertor yield conductances comparable to those found in dedicated experiments. All are significantly smaller than the conductance found with the previously used axisymmetric geometry. A benchmarking exercise of the code against known conductance values for gas flow through a simple pipe provides a physical basis for interpreting the comparison of the three-dimensional and experimental C-Mod con… more
Date: June 15, 2004
Creator: Stotler, D. P. & LaBombard, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A corrected and generalized successive random additions algorithm for simulating fractional levy motions

Description: Simulation of subsurface heterogeneity is important for modeling subsurface flow and transport processes. Previous studies have indicated that subsurface property variations can often be characterized by fractional Brownian motion (fBm) or (truncated) fractional Levy motion (fLm). Because Levy-stable distributions have many novel and often unfamiliar properties, studies on generating fLm distributions are rare in the literature. In this study, we generalize a relatively simple and computational… more
Date: May 29, 2002
Creator: Liu, Hui-Hai; Bodvarsson, Gudmundur S.; Lu, Silong & Molz, Fred J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Diagnostics for the Combustion Science Workbench

Description: As the cost of computers declines relative to outfitting andmaintaining laser spectroscopy laboratories, computers will account foran increasing proportion of the research conducted in fundamentalcombustion science. W.C. Gardiner foresaw that progress will be limitedby the ability to understand the implications of what has been computedand to draw inferences about the elementary components of the combustionmodels. Yet the diagnostics that are routinely applied to computerexperiments have change… more
Date: February 21, 2007
Creator: Grcar, J. F.; Day, M. S. & Bell, J. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Rollback Reduction Techniques Through Load Balancing in Optimistic Parallel Discrete Event Simulation

Description: Discrete event simulation is an important tool for modeling and analysis. Some of the simulation applications such as telecommunication network performance, VLSI logic circuits design, battlefield simulation, require enormous amount of computing resources. One way to satisfy this demand for computing power is to decompose the simulation system into several logical processes (Ip) and run them concurrently. In any parallel discrete event simulation (PDES) system, the events are ordered according … more
Date: May 1996
Creator: Sarkar, Falguni
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
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Simulations of Temperatures in Burning Tokamak Plasmas using the GLF23 Model in the TRANSP Code

Description: The GLF23 prediction model, incorporated in the TRANSP plasma analysis code, is used to predict temperatures for burning plasmas in the proposed FIRE and ITER-FEAT tokamaks. Flat electron density profiles with various central values are assumed. Scaling of the fusion power P(subscript)dt and gain Q(subscript)dt with density (subscript)and pedestal temperature are given. Helium ash transport and sawtooth effect Pdt in long duration ITER-FEAT plasmas.
Date: August 13, 2002
Creator: Budny, R.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Steady-State Gyrokinetics Transport Code (SSGKT), A Scientific Application Partnership with the Framework Application for Core-Edge Transport Simulations, Final Report

Description: This project initiated the development of TGYRO ? a steady-state Gyrokinetic transport code (SSGKT) that integrates micro-scale GYRO turbulence simulations into a framework for practical multi-scale simulation of conventional tokamaks as well as future reactors. Using a lightweight master transport code, multiple independent (each massively parallel) gyrokinetic simulations are coordinated. The capability to evolve profiles using the TGLF model was also added to TGYRO and represents a more typi… more
Date: November 7, 2013
Creator: Fahey, Mark R. & Candy, Jeff
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Speeding Up Simulations of Relativistic Systems using an Optimal Boosted Frame

Description: It can be computationally advantageous to perform computer simulations in a Lorentz boosted frame for a certain class of systems. However, even if the computer model relies on a covariant set of equations, it has been pointed out that algorithmic difficulties related to discretization errors may have to be overcome in order to take full advantage of the potential speedup. We summarize the findings, the difficulties and their solutions, and show that the technique enables simulations important t… more
Date: January 27, 2009
Creator: Vay, J. L.; Fawley, W. M.; Geddes, C. G. R.; Cormier-Michel, E. & Grote, D. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simulation of lean premixed turbulent combustion

Description: There is considerable technological interest in developingnew fuel-flexible combustion systems that can burn fuels such ashydrogenor syngas. Lean premixed systems have the potential to burn thesetypes of fuels with high efficiency and low NOx emissions due to reducedburnt gas temperatures. Although traditional scientific approaches basedon theory and laboratory experiment have played essential roles indeveloping our current understanding of premixed combustion, they areunable to meet the challe… more
Date: June 25, 2006
Creator: Bell, John B.; Day, Marcus S.; Almgren, Ann S.; Lijewski, MichaelJ.; Rendleman, Charles A.; Cheng, Robert K. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Relation of validation experiments to applications.

Description: Computational and mathematical models are developed in engineering to represent the behavior of physical systems to various system inputs and conditions. These models are often used to predict at other conditions, rather than to just reproduce the behavior of data obtained at the experimental conditions. For example, the boundary or initial conditions, time of prediction, geometry, material properties, and other model parameters can be different at test conditions than those for an anticipated … more
Date: February 1, 2009
Creator: Hamilton, James R. (New Mexico State University, Las Cruces, NM) & Hills, Richard Guy
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Efficient Modeling of Laser-Plasma Accelerators with INF&RNO

Description: The numerical modeling code INF&RNO (INtegrated Fluid& paRticle simulatioN cOde, pronounced"inferno") is presented. INF&RNO is an efficient 2D cylindrical code to model the interaction of a short laser pulse with an underdense plasma. The code is based on an envelope model for the laser while either a PIC or a fluid description can be used for the plasma. The effect of the laser pulse on the plasma is modeled with the time-averaged poderomotive force. These and other featu… more
Date: June 1, 2010
Creator: Benedetti, C.; Schroeder, C. B.; Esarey, E.; Geddes, C. G. R. & Leemans, W. P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Benchmarking Nonlinear Turbulence Simulations on Alcator C-Mod

Description: Linear simulations of plasma microturbulence are used with recent radial profiles of toroidal velocity from similar plasmas to consider nonlinear microturbulence simulations and observed transport analysis on Alcator C-Mod. We focus on internal transport barrier (ITB) formation in fully equilibrated H-mode plasmas with nearly flat velocity profiles. Velocity profile data, transport analysis and linear growth rates are combined to integrate data and simulation, and explore the effects of toroida… more
Date: June 22, 2004
Creator: Redi, M.H.; Fiore, C.L.; Dorland, W.; Greenwald, M.J.; Hammett, G.W.; Hill, K. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Effect on Stellarator Neoclassical Transport of a Fluctuating Electrostatic Spectrum

Description: We study the effect on neoclassical transport of applying a fluctuating electrostatic spectrum, such as produced either by plasma turbulence, or imposed externally. For tokamaks, it is usually assumed that the neoclassical and ''anomalous'' contributions to the transport roughly superpose, D = D{sub nc} + D{sub an}, an intuition also used in modeling stellarators. An alternate intuition, however, is one where it is the collisional and anomalous scattering frequencies which superpose, {nu}{sub e… more
Date: November 23, 2004
Creator: Mynick, H. E. & Boozer, A. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Particle Tracking and Simulation on the .NET Framework

Description: Particle tracking and simulation studies are becoming increasingly complex. In addition to the use of more sophisticated graphics, interactive scripting is becoming popular. Compatibility with different control systems requires network and database capabilities. It is not a trivial task to fulfill all the various requirements without sacrificing runtime performance. We evaluated the effectiveness of the .NET framework by converting a C++ simulation code to C. The portability to other platforms … more
Date: June 19, 2006
Creator: Nishimura, Hiroshi & Scarvie, Tom
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simulation and Analysis of the Hybrid Operating Mode in ITER

Description: The hybrid operating mode in ITER is examined with 0D systems analysis, 1.5D discharge scenario simulations using TSC and TRANSP, and the ideal MHD stability is discussed. The hybrid mode has the potential to provide very long pulses and significant neutron fluence if the physics regime can be produced in ITER. This paper reports progress in establishing the physics basis and engineering limitation for the hybrid mode in ITER.
Date: September 22, 2005
Creator: Kessel, C. E.; Budny, R. V. & Indireshkumar, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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