58 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Computational Fluid Dynamics"  
Results: 1 - 24 next
open access

Development of a direct-injected natural gas engine system for heavy-duty vehicles: Final report phase 2

Description: This report summarizes the results of Phase 2 of this contract. The authors completed four tasks under this phase of the subcontract. (1) They developed a computational fluid dynamics (CFD) model of a 3500 direct injected natural gas (DING) engine gas injection/combustion system and used it to identify DING ignition/combustion system improvements. The results were a 20% improvement in efficiency compared to Phase 1 testing. (2) The authors designed and procured the components for a 3126 DING en… more
Date: March 2, 2000
Creator: Cox, G.B.; DelVecchio, K.A.; Hays, W.J.; Hiltner, J.D.; Nagaraj, R. & Emmer, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Alliance for Computational Science Collaboration, HBCU Partnership at Alabama A&M University Final Performance Technical Report

Description: The objective of this project was to conduct high-performance computing research and teaching at AAMU, and to train African-American and other minority students and scientists in the computational science field for eventual employment with DOE. During the project period, eight tasks were accomplished. Student Research Assistant, Work Study, Summer Interns, Scholarship were proved to be one of the best ways for us to attract top-quality minority students. Under the support of DOE, through resear… more
Date: November 15, 2001
Creator: Deng, Z. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mixture Preparation and Nitric Oxide Formation in a GDI Engine studied by Combined Laser Diagnostics and Numerical Modeling

Description: Through the combination of advanced imaging laser diagnostics with multi-dimensional computer models, a new understanding of the performance of direct-injection gasoline engines is pursuit. The work focuses on the fuel injection process, the breakup of the liquid into a fine spray and the mixing of the fuel with the in-cylinder gases. Non-intrusive laser diagnostics will be used to measure the spatial distribution of droplets and vaporized fuel with very high temporal resolution. These data alo… more
Date: November 27, 2002
Creator: Sick, Volker & Assanis, Dennis N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Active flow control for maximizing performance of spark ignited stratified charge engines. Final report

Description: Reducing the cycle-to-cycle variability present in stratified-charge engines is an important step in the process of increasing their efficiency. As a result of this cycle-to-cycle variability, fuel injection systems are calibrated to inject more fuel than necessary, in an attempt to ensure that the engines fire on every cycle. When the cycle-to-cycle variability is lowered, the variation of work per cycle is reduced and the lean operating limit decreases, resulting in increased fuel economy. In… more
Date: October 15, 2002
Creator: Fedewa, Andrew; Stuecken, Tom; Timm, Edward; Schock, Harold J.; Shih, Tom-I.P.; Koochesfahani, Manooch et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Infiltration Heat Recovery in Building Walls: Computational Fluid Dynamics Investigations Results

Description: Conventional calculations of heating (and cooling) loads for buildings assume that conduction heat loss (or gain) through walls is independent of air infiltration heat loss (or gain). During passage through the building envelope, infiltrating air substantially exchanges heat wall insulation leading to partial recovery of heat conducted through the wall. The Infiltration Heat Recovery (IHR) factor was introduced to quantify the heat recovery and correct the conventional calculations. In this stu… more
Date: August 5, 2002
Creator: Abadie, Marc O.; Finlayson, Elizabeth U. & Gadgil, Ashok J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A B-Spline-Based Colocation Method to Approximate the Solutions to the Equations of Fluid Dynamics

Description: The potential of a B-spline collocation method for numerically solving the equations of fluid dynamics is discussed. It is known that B-splines can resolve complex curves with drastically fewer data than can their standard shape function counterparts. This feature promises to allow much faster numerical simulations of fluid flow than standard finite volume/finite element methods without sacrificing accuracy. An example channel flow problem is solved using the method.
Date: July 1, 1999
Creator: Landon, M. D. & Johnson, R. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Minimization of Blast furnace Fuel Rate by Optimizing Burden and Gas Distribution

Description: The goal of the research is to improve the competitive edge of steel mills by using the advanced CFD technology to optimize the gas and burden distributions inside a blast furnace for achieving the best gas utilization. A state-of-the-art 3-D CFD model has been developed for simulating the gas distribution inside a blast furnace at given burden conditions, burden distribution and blast parameters. The comprehensive 3-D CFD model has been validated by plant measurement data from an actual blast … more
Date: August 15, 2012
Creator: Zhou, Chenn
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Wind Turbine Modeling for Computational Fluid Dynamics: December 2010 - December 2012

Description: With the shortage of fossil fuel and the increasing environmental awareness, wind energy is becoming more and more important. As the market for wind energy grows, wind turbines and wind farms are becoming larger. Current utility-scale turbines extend a significant distance into the atmospheric boundary layer. Therefore, the interaction between the atmospheric boundary layer and the turbines and their wakes needs to be better understood. The turbulent wakes of upstream turbines affect the flow f… more
Date: July 1, 2013
Creator: Tossas, L. A. M. & Leonardi, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report - High-Order Spectral Volume Method for the Navier-Stokes Equations On Unstructured Tetrahedral Grids

Description: The overriding objective for this project is to develop an efficient and accurate method for capturing strong discontinuities and fine smooth flow structures of disparate length scales with unstructured grids, and demonstrate its potentials for problems relevant to DOE. More specifically, we plan to achieve the following objectives: 1. Extend the SV method to three dimensions, and develop a fourth-order accurate SV scheme for tetrahedral grids. Optimize the SV partition by minimizing a form of … more
Date: December 6, 2012
Creator: Wang, Z J
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bonneville Powerhouse 2 Fish Guidance Efficiency Studies: CFD Model of the Forebay

Description: In ongoing work, U.S. Army Corps of Engineers, Portland District (CENWP) is seeking to better understand and improve the conditions within the Bonneville Powerhouse 2 (B2) turbine intakes to improve survival of downstream migrant salmonid smolt. In this study, the existing B2 forebay computational fluid dynamics (CFD) model was modified to include a more detailed representation of all B2 turbine intakes. The modified model was validated to existing field-measured forebay ADCP velocities. The in… more
Date: July 1, 2012
Creator: Rakowski, Cynthia L.; Serkowski, John A. & Richmond, Marshall C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MarmotViz User Guide

Description: MarmotViz is an illustrative visualization plug-in for ParaView. It is intended for generating enhanced visualizations of time-varying datasets on unstructured connected meshes. A detailed description of the implemented algorithms and program structure can be found in the related document: Generalized framework and algorithms for illustrative visualization of time-varying data on unstructured meshes . This document provides details for compiling/building MarmotViz, using the MarmotViz plug-in i… more
Date: August 1, 2012
Creator: Rattner, Alexander S.; Guillen, Donna Post; Garimella, Srinivas & Joshi, Alark
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Navier-Stokes Solvers and Generalizations for Reacting Flow Problems

Description: This is an overview of our accomplishments during the final term of this grant (1 September 2008 -- 30 June 2012). These fall mainly into three categories: fast algorithms for linear eigenvalue problems; solution algorithms and modeling methods for partial differential equations with uncertain coefficients; and preconditioning methods and solvers for models of computational fluid dynamics (CFD).
Date: January 27, 2013
Creator: Elman, Howard C
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report for NFE-07-00912: Development of Model Fuels Experimental Engine Data Base & Kinetic Modeling Parameter Sets

Description: The automotive and engine industries are in a period of very rapid change being driven by new emission standards, new types of after treatment, new combustion strategies, the introduction of new fuels, and drive for increased fuel economy and efficiency. The rapid pace of these changes has put more pressure on the need for modeling of engine combustion and performance, in order to shorten product design and introduction cycles. New combustion strategies include homogeneous charge compression ig… more
Date: October 1, 2012
Creator: Bunting, Bruce G
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

COMPUTATIONAL MODELING OF CIRCULATING FLUIDIZED BED REACTORS

Description: Details of numerical simulations of two-phase gas-solid turbulent flow in the riser section of Circulating Fluidized Bed Reactor (CFBR) using Computational Fluid Dynamics (CFD) technique are reported. Two CFBR riser configurations are considered and modeled. Each of these two riser models consist of inlet, exit, connecting elbows and a main pipe. Both riser configurations are cylindrical and have the same diameter but differ in their inlet lengths and main pipe height to enable investigation of… more
Date: January 9, 2013
Creator: Ibrahim, Essam A
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis of Numerical Methods for Modeling Wave Energy Converter-Point Absorbers: Preprint

Description: During the past few decades, wave energy has received significant attention among all ocean energy formats. Industry has proposed hundreds of prototypes such as an oscillating water column, a point absorber, an overtopping system, and a bottom-hinged system. In particular, many researchers have focused on modeling the floating-point absorber as the technology to extract wave energy. Several modeling methods have been used such as the analytical method, the boundary-integral equation method, the… more
Date: May 1, 2012
Creator: Li, Y. & Yu, Y. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Bypass Flow Study

Description: The purpose of the fluid dynamics experiments in the MIR (Matched Index of-Refraction) flow system at Idaho National Laboratory (INL) is to develop benchmark databases for the assessment of Computational Fluid Dynamics (CFD) solutions of the momentum equations, scalar mixing, and turbulence models for the flow ratios between coolant channels and bypass gaps in the interstitial regions of typical prismatic standard fuel element (SFE) or upper reflector block geometries of typical Modular High-te… more
Date: September 1, 2011
Creator: Schultz, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Airflow Simulations around OA Intake Louver with Electronic Velocity Sensors

Description: It is important to control outdoor airflow rates into HVAC systems in terms of energy conservation and healthy indoor environment. Technologies are being developed to measure outdoor air (OA) flow rates through OA intake louvers on a real time basis. The purpose of this paper is to investigate the airflow characteristics through an OA intake louver numerically in order to provide suggestions for sensor installations. Airflow patterns are simulated with and without electronic air velocity sensor… more
Date: April 1, 2009
Creator: Han, Hwataik; Sullivan, Douglas P. & Fisk, William J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Prediction of Air Mixing From High Sidewall Diffusers in Cooling Mode: Preprint

Description: Computational fluid dynamics modeling was used to evaluate the performance of high sidewall air supply in cooling mode. The research focused on the design, placement, and operation of air supply diffusers located high on a sidewall and return grilles located near the floor on the same sidewall. Parameters of the study are the supply velocity, supply temperature, diffuser dimensions and room dimensions. Thermal loads characteristic of high performance homes were applied at the walls and room tem… more
Date: February 1, 2011
Creator: Ridouane, E. H. & Gawlik, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

NREL Evaluates the Thermal Performance of Uninsulated Walls to Improve the Accuracy of Building Energy Simulation Tools (Fact Sheet)

Description: This technical highlight describes NREL research to develop models of uninsulated wall assemblies that help to improve the accuracy of building energy simulation tools when modeling potential energy savings in older homes. Researchers at the National Renewable Energy Laboratory (NREL) have developed models for evaluating the thermal performance of walls in existing homes that will improve the accuracy of building energy simulation tools when predicting potential energy savings of existing homes… more
Date: January 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Three-Dimensional Numerical Evaluation of Thermal Performance of Uninsulated Wall Assemblies: Preprint

Description: This study describes a detailed three-dimensional computational fluid dynamics modeling to evaluate the thermal performance of uninsulated wall assemblies accounting for conduction through framing, convection, and radiation. The model allows for material properties variations with temperature. Parameters that were varied in the study include ambient outdoor temperature and cavity surface emissivity. Understanding the thermal performance of uninsulated wall cavities is essential for accurate pre… more
Date: November 1, 2011
Creator: Ridouane, E. H. & Bianchi, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of Air Mixing and Thermal Comfort From High Sidewall Supply Air Jets

Description: Uniform mixing of conditioned air with room air is an essential factor for providing comfort in homes. The higher the supply flow rates the easier to reach good mixing in the space. In high performance homes, however, the flow rates required to meet the small remaining thermal loads are not large enough to maintain uniform mixing in the space. The objective of this study is to resolve this issue and maintain uniform temperatures within future homes. We used computational fluid dynamics modeling… more
Date: September 1, 2011
Creator: Ridouane, E. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

NREL Evaluates Thermal Performance of Uninsulated Walls to Improve Accuracy of Building Energy Simulation Tools (Fact Sheet)

Description: NREL researchers discover ways to increase accuracy in building energy simulations tools to improve predictions of potential energy savings in homes. Uninsulated walls are typical in older U.S. homes where the wall cavities were not insulated during construction or where the insulating material has settled. Researchers at the National Renewable Energy Laboratory (NREL) are investigating ways to more accurately calculate heat transfer through building enclosures to verify the benefit of energy e… more
Date: March 1, 2012
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational Fluid Dynamics Modeling of The Dalles Project: Effects of Spill Flow Distribution Between the Washington Shore and the Tailrace Spillwall

Description: The U.S. Army Corps of Engineers-Portland District (CENWP) has ongoing work to improve the survival of juvenile salmonids (smolt) migrating past The Dalles Dam. As part of that effort, a spillwall was constructed to improve juvenile egress through the tailrace downstream of the stilling basin. The spillwall was designed to improve smolt survival by decreasing smolt retention time in the spillway tailrace and the exposure to predators on the spillway shelf. The spillwall guides spillway flows, a… more
Date: December 1, 2010
Creator: Rakowski, Cynthia L.; Serkowski, John A. & Richmond, Marshall C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen