132 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Hydrodynamic Model"  
Results: 1 - 24 next
open access

Hydrodynamic Modeling of Air Blast Propagation from the Humble Redwood Chemical High Explosive Detonations Using GEODYN

Description: Two-dimensional axisymmetric hydrodynamic models were developed using GEODYN to simulate the propagation of air blasts resulting from a series of high explosive detonations conducted at Kirtland Air Force Base in August and September of 2007. Dubbed Humble Redwood I (HR-1), these near-surface chemical high explosive detonations consisted of seven shots of varying height or depth of burst. Each shot was simulated numerically using GEODYN. An adaptive mesh refinement scheme based on air pressure … more
Date: September 20, 2011
Creator: Chipman, V D
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Role of Viscosity in TATB Hot Spot Ignition

Description: The role of dissipative effects, such as viscosity, in the ignition of high explosive pores is investigated using a coupled chemical, thermal, and hydrodynamic model. Chemical reactions are tracked with the Cheetah thermochemical code coupled to the ALE3D hydrodynamic code. We perform molecular dynamics simulations to determine the viscosity of liquid TATB. We also analyze shock wave experiments to obtain an estimate for the shock viscosity of TATB. Using the lower bound liquid-like viscosities… more
Date: August 2, 2011
Creator: Fried, L. E.; Zepeda-Ruis, L.; Howard, W. M.; Najjar, F. & Reaugh, J. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic Modeling Analysis of Union Slough Restoration Project in Snohomish River, Washington

Description: A modeling study was conducted to evaluate additional project design scenarios at the Union Slough restoration/mitigation site during low tide and to provide recommendations for finish-grade elevations to achieve desired drainage. This was accomplished using the Snohomish River hydrodynamic model developed previously by PNNL.
Date: December 20, 2010
Creator: Yang, Zhaoqing & Wang, Taiping
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Puget Sound Dissolved Oxygen Modeling Study: Development of an Intermediate-Scale Hydrodynamic Model

Description: The Washington State Department of Ecology contracted with Pacific Northwest National Laboratory to develop an intermediate-scale hydrodynamic and water quality model to study dissolved oxygen and nutrient dynamics in Puget Sound and to help define potential Puget Sound-wide nutrient management strategies and decisions. Specifically, the project is expected to help determine 1) if current and potential future nitrogen loadings from point and non-point sources are significantly impairing water q… more
Date: November 30, 2010
Creator: Yang, Zhaoqing; Khangaonkar, Tarang; Labiosa, Rochelle G. & Kim, Taeyun
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment of Energy Removal Impacts on Physical Systems: Hydrodynamic Model Domain Expansion and Refinement, and Online Dissemination of Model Results

Description: In this report we describe the 1) the expansion of the PNNL hydrodynamic model domain to include the continental shelf along the coasts of Washington, Oregon, and Vancouver Island; and 2) the approach and progress in developing the online/Internet disseminations of model results and outreach efforts in support of the Puget Sound Operational Forecast System (PS-OPF). Submittal of this report completes the work on Task 2.1.2, Effects of Physical Systems, Subtask 2.1.2.1, Hydrodynamics, for fiscal… more
Date: August 1, 2010
Creator: Yang, Zhaoqing; Khangaonkar, Tarang & Wang, Taiping
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of a Hydrodynamic and Transport model of Bellingham Bay in Support of Nearshore Habitat Restoration

Description: In this study, a hydrodynamic model based on the unstructured-grid finite volume coastal ocean model (FVCOM) was developed for Bellingham Bay, Washington. The model simulates water surface elevation, velocity, temperature, and salinity in a three-dimensional domain that covers the entire Bellingham Bay and adjacent water bodies, including Lummi Bay, Samish Bay, Padilla Bay, and Rosario Strait. The model was developed using Pacific Northwest National Laboratory’s high-resolution Puget Sound and … more
Date: April 22, 2010
Creator: Wang, Taiping; Yang, Zhaoqing & Khangaonkar, Tarang
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optimization of a Two-Fluid Hydrodynamic Model of Churn-Turbulent Flow

Description: A hydrodynamic model of two-phase, churn-turbulent flows is being developed using the computational multiphase fluid dynamics (CMFD) code, NPHASE-CMFD. The numerical solutions obtained by this model are compared with experimental data obtained at the TOPFLOW facility of the Institute of Safety Research at the Forschungszentrum Dresden-Rossendorf. The TOPFLOW data is a high quality experimental database of upward, co-current air-water flows in a vertical pipe suitable for validation of computati… more
Date: July 1, 2009
Creator: Guillen, Donna Post
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quantifying the Behavioral Response of Spawning Chum Salmon to Elevated Discharges from Bonneville Dam, Columbia River : Annual Report 2005-2006.

Description: In unimpounded rivers, Pacific salmon (Oncorhynchus spp.) typically spawn under relatively stable stream flows, with exceptions occurring during periodic precipitation events. In contrast, hydroelectric development has often resulted in an artificial hydrograph characterized by rapid changes in discharge and tailwater elevation that occur on a daily, or even an hourly basis, due to power generation (Cushman 1985; Moog 1993). Consequently, populations of Pacific salmon that are known to spawn in… more
Date: December 1, 2008
Creator: Tiffan, Kenneth F.; Haskell, Craig A. & Kock, Tobias J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Incorporation of Reaction Kinetics into a Multiphase, Hydrodynamic Model of a Fischer Tropsch Slurry Bubble Column Reactor

Description: This paper describes the development of a computational multiphase fluid dynamics (CMFD) model of the Fischer Tropsch (FT) process in a Slurry Bubble Column Reactor (SBCR). The CMFD model is fundamentally based which allows it to be applied to different industrial processes and reactor geometries. The NPHASE CMFD solver [1] is used as the robust computational platform. Results from the CMFD model include gas distribution, species concentration profiles, and local temperatures within the SBCR. T… more
Date: November 1, 2008
Creator: Donna Guillen, PhD; Gribik, Anastasia; Daniel Ginosar, PhD & Steven P. Antal, PhD
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

KINETIC MODELING OF A FISCHER-TROPSCH REACTION OVER A COBALT CATALYST IN A SLURRY BUBBLE COLUMN REACTOR FOR INCORPORATION INTO A COMPUTATIONAL MULTIPHASE FLUID DYNAMICS MODEL

Description: Currently multi-tubular fixed bed reactors, fluidized bed reactors, and slurry bubble column reactors (SBCRs) are used in commercial Fischer Tropsch (FT) synthesis. There are a number of advantages of the SBCR compared to fixed and fluidized bed reactors. The main advantage of the SBCR is that temperature control and heat recovery are more easily achieved. The SBCR is a multiphase chemical reactor where a synthesis gas, comprised mainly of H2 and CO, is bubbled through a liquid hydrocarbon wax … more
Date: September 1, 2008
Creator: Gribik, Anastasia; Doona Guillen, PhD & Daniel Ginosar, PhD
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of a Hydrodynamic Model of Puget Sound and Northwest Straits

Description: The hydrodynamic model used in this study is the Finite Volume Coastal Ocean Model (FVCOM) developed by the University of Massachusetts at Dartmouth. The unstructured grid and finite volume framework, as well as the capability of wetting/drying simulation and baroclinic simulation, makes FVCOM a good fit to the modeling needs for nearshore restoration in Puget Sound. The model domain covers the entire Puget Sound, Strait of Juan de Fuca, San Juan Passages, and Georgia Strait at the United State… more
Date: December 10, 2007
Creator: Yang, Zhaoqing & Khangaonkar, Tarang P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mutiscale Modeling of Segregation in Granular Flows

Description: Modeling and simulation of segregation phenomena in granular flows are investigated. Computational models at different scales ranging from particle level (microscale) to continuum level (macroscale) are employed in order to determine the important microscale physics relevant to macroscale modeling. The capability of a multi-fluid model to capture segregation caused by density difference is demonstrated by simulating grain-chaff biomass flows in a laboratory-scale air column and in a combine har… more
Date: August 3, 2007
Creator: Sun, Jin
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

MASS2, Modular Aquatic Simulation System in Two Dimensions, Theory and Numerical Methods

Description: The Modular Aquatic Simulation System in Two Dimensions (MASS2) is a two-dimensional, depth-averaged hydrodynamics and transport model. The model simulates time varying distributions of depth-averaged velocities, water surface elevations, and water quality constituents. MASS2 uses a structured, multi-block, boundary-fitted, curvilinear computational mesh, which allows the simulation of very complex riverine or estuarine networks. The blocks may be of varying resolution, which allows high resolu… more
Date: July 1, 2007
Creator: Perkins, William A. & Richmond, Marshall C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

MASS2, Modular Aquatic Simulation System in Two Dimensions, User Guide and Reference

Description: The Modular Aquatic Simulation System in Two Dimensions (MASS2) is a two-dimensional, depth-averaged hydrodynamics and transport model. The model simulates time varying distributions of depth-averaged velocities, water surface elevations, and water quality constituents. This manual documents the use of MASS2. It is the second of two reports on MASS2. The first report documents the theory and numerical methods used in MASS2, and is often referred to herein as the Theory Manual. MASS2 is applicab… more
Date: July 1, 2007
Creator: Perkins, William A. & Richmond, Marshall C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

FUTURE SCIENCE AT THE RELATIVISTIC HEAVY ION COLLIDER.

Description: QCD was developed in the 1970's as a theory of the strong interaction describing the confinement of quarks in hadrons. An early consequence of this picture was the realization that at sufficiently high temperature, or energy density, the confining forces are overcome by color screening effects, resulting in a transition from hadronic matter to a new state--later named the Quark Gluon Plasma--whose bulk dynamical properties are determined by the quark and gluon degrees of freedom, rather than th… more
Date: December 21, 2006
Creator: LUDLAM, T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

3-D Hydrodynamic Modeling in a Geospatial Framework

Description: 3-D hydrodynamic models are used by the Savannah River National Laboratory (SRNL) to simulate the transport of thermal and radionuclide discharges in coastal estuary systems. Development of such models requires accurate bathymetry, coastline, and boundary condition data in conjunction with the ability to rapidly discretize model domains and interpolate the required geospatial data onto the domain. To facilitate rapid and accurate hydrodynamic model development, SRNL has developed a pre- and pos… more
Date: August 24, 2006
Creator: Bollinger, J.; Alfred Garrett, A.; Larry Koffman, L. & David Hayes, D
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Improving the Capabilities of a Continuum Laser Plasma Interaction Code

Description: The numerical simulation of plasmas is a critical tool for inertial confinement fusion (ICF). We have been working to improve the predictive capability of a continuum laser plasma interaction code pF3d, which couples a continuum hydrodynamic model of an unmagnetized plasma to paraxial wave equations modeling the laser light. Advanced numerical techniques such as local mesh refinement, multigrid, and multifluid Godunov methods have been adapted and applied to nonlinear heat conduction and to mul… more
Date: June 15, 2006
Creator: Hittinger, J F & Dorr, M R
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Anisotropic flow nu2 in Au + Au collisions at RHIC

Description: Using the RQMD model, transverse momentum dependence of the anisotropic flow v{sub 2} for {pi}, K, nucleon, {phi}, and {lambda}, are studied for Au + Au collisions at {radical}s{sub NN} = 200 GeV. Both hydrodynamic hadron-mass hiragracy (hhmh) at low p{sub T} region and particle type dependence (baryon versus meson) at the intermediate p{sub T} region are reproduced with the model calculations although the model underpredicted the overall values of v{sub 2} by a factor of 2-3. As expected, when… more
Date: August 20, 2005
Creator: Lu, Y.; Bleicher, M.; Liu, F.; Kiu, Z.; Sorensen, P.; Stocker,H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Review of Systematic Investigations of the Rout/Rside ratio in HBT at RHIC

Description: We review the significant difference in the ratio R{sub out}/R{sub side} between experiment and theory in heavy-ion collisions at RHIC. This ratio is expected to be strongly correlated with the pion emission duration. Hydrodynamic models typically calculate a value that approximately equal to 1.5 and moderately dependent on k{sub T} whereas the experiments report a value close to unity and independent of k{sub T}. We review those calculations in which systematic variations in the theoretical as… more
Date: January 6, 2005
Creator: Soltz, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simulating the Flow Field Upstream of the Dworshak Dam Regulating Outlets

Description: The Pacific Northwest National Laboratory numerically modeled flow conditions upstream of the regulating outlets at Dworshak Dam, North Fork Clearwater River, Idaho. Simulations were performed using the computational fluid dynamics model Flow-3D, a peer reviewed and validated three-dimensional Reynolds-averaged Navier-Stokes hydrodynamic model. Results were studied to determine the impacts of water surface elevation and discharge though the three regulating outlets on flow velocities in the res… more
Date: March 20, 2004
Creator: Cook, Chris B. & Richmond, Marshall C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A new phase of matter in Oakland

Description: Recent results from the Relativistic Heavy Ion Collider (RHIC) and the phase diagram of matter at very high energies were the focal points of Quark Matter 2004, held January 10-17, 2004 in the Oakland, California convention center. About 700 participants, including 125 students, from 28 countries gathered for 5 days of plenary and parallel sessions. Besides the scientific discussions, participants enjoyed an afternoon of excursions; choices included visits to San Francisco, the Muir woods, and,… more
Date: March 18, 2004
Creator: Klein, Spencer & Nystrand, Joakim
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effects of Segmented Electrode in Hall Current Plasma Thrusters

Description: Segmented electrodes with a low secondary electron emission are shown to alter significantly plasma flow in the ceramic channel of the Hall thruster. The location of the axial acceleration region relative to the magnetic field can be moved. The radial potential distribution can also be altered near the channel walls. A hydrodynamic model shows that these effects are consistent with a lower secondary electron emission of the segmented electrode as compared to ceramic channel walls.
Date: December 3, 2001
Creator: Raitses, Y.; Keidar, M.; Staack, D. & Fisch, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Beam-Target Interaction Experiments for Multipulse Bremsstrahlung Converters Applications

Description: As part of the Dual Axis Radiography Hydrotest Facility, Phase II (DARHT II) multipulse Bremsstrahlung target, we have been performing an investigation of (1) the possible adverse effects of backstreaming ion emission from the Bremsstrahlung converter target and (2) maintaining sufficient target density to ensure dose in latter pulses. Theory predictions show that the first effect would primarily be manifested in the static focusing system as a rapidly varying x-ray spot. From experiments perfo… more
Date: June 18, 2001
Creator: Sampayan, S.; Buckles, R.; Caporaso, G.; Chambers, F. C.; Chen, Y. J.; Falabella, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen