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Overview of the dynamic-hohlraum x-ray source at Sandia National Laboratories.

Description: Progress in understanding the physics of Dynamic-Hohlraums is reviewed for a system capable of generating 10 TW of axial radiation for high temperature (>200 eV) radiation-flow experiments and ICF capsule implosions. 2D magneto-hydrodynamic simulation comparisons with data show the need to include wire initiation physics and subsequent discrete wire dynamics in the simulations if a predictive capability is to be achieved.
Date: April 1, 2007
Creator: Sanford, Thomas W. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lagrangian continuum dynamics in ALEGRA.

Description: Alegra is an ALE (Arbitrary Lagrangian-Eulerian) multi-material finite element code that emphasizes large deformations and strong shock physics. The Lagrangian continuum dynamics package in Alegra uses a Galerkin finite element spatial discretization and an explicit central-difference stepping method in time. The goal of this report is to describe in detail the characteristics of this algorithm, including the conservation and stability properties. The details provided should help both researche… more
Date: December 1, 2007
Creator: Wong, Michael K. W. & Love, Edward
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Three-dimensional numerical simulations of Rayleigh-Taylorunstable flames in type Ia supernovae

Description: Flame instabilities play a dominant role in accelerating the burning front to a large fraction of the speed of sound in a Type Ia supernova. We present a three-dimensional numerical simulation of a Rayleigh-Taylor unstable carbon flame, following its evolution through the transition to turbulence. A low Mach number hydrodynamics method is used, freeing us from the harsh time step restrictions imposed by sound waves. We fully resolve the thermal structure of the flame and its reaction zone, elim… more
Date: January 28, 2005
Creator: Zingale, M.; Woosley, S.E.; Rendleman, C.A.; Day, M.S. & Bell, J.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The hydrodynamic characteristics of modified rectangular flat plates having aspect ratios of 1.00, 0.25, and 0.125 and operating near a free water surface

Description: Report presents the results of an investigation conducted to determine the hydrodynamic forces and moments acting on modified rectangular flat plates with aspect ratios of 1.00, 0.25, and 0.125 mounted on a single strut and operating at several depths of submersion. A simple method has been developed by modification of Falkner's vortex-lattice theory which enables the prediction of the lift characteristics in unseparated flow at large depths. This method shows good agreement with experimental d… more
Date: January 19, 1954
Creator: Wadlin, Kenneth L.; Ramsen, John A. & Vaughan, Victor L., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Determination of Rate, Area, and Distribution of Impingement of Waterdrops on Various Airfoils From Trajectories Obtained on the Differential Analyzer

Description: "The trajectories of waterdrops in air flowing over airfoils are determined for three airfoil - angle-of-attack combinations using the differential analyzer to solve the differential equations of motion of the waterdrops. From these trajectories the rate of water impingement, the area of impingement, and the distribution of impingement are determined as functions of two dimensionless moduli. Comparisons are made of the rate of water impingement on these airfoils and the rate of water impingemen… more
Date: February 16, 1949
Creator: Guibert, A. G.; Janssen, E. & Robbins, W. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of the planing lift of a flat plate at speeds up to 170 feet per second

Description: Report presenting an investigation in the high-speed hydrodynamics facility to determine whether planing lift coefficient of a flat-bottom planing surface remains constant with increasing speed at the high towing speeds obtainable. The generally accepted assumption that there is no effect of speed on the lift coefficient of positive-pressure lifting surfaces is valid at least up to 170 fps.
Date: March 1957
Creator: Christopher, Kenneth W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic Investigation of a Series of Hull Models Suitable for Small Flying Boats and Amphibians

Description: Note presenting the results of an investigation to obtain hydrodynamic information on a series of hull models suitable for small flying boats or amphibians of from 2000 to 5000 pounds gross weight. The series of hulls consisted of a basic hull with simple lines, and of plus and minus variations to the design in which the beam, stern-post angle, and afterbody length were altered. The results show that it is possible to design a hull with simple lines that will be suitable for small flying boats … more
Date: November 1951
Creator: Hugli, W. C., Jr. & Axt, W. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An experimental investigation of wake effects on hydro-skis

Description: Report presenting an experimental investigation to determine the effects of planing in a wake on the forces of a planing surface and to locate desirable positions in the wake with regard to the lift and lift-drag ratio of the planing surface. Two combinations of hydro-skis were tested: one with two in tandem and one with three arranged with one hydro-ski in the front and two in the back. Results indicated that the rear hydro-ski in tandem arrangement could have large increases in lift coefficie… more
Date: May 1958
Creator: McBride, Ellis E. & Fisher, Lloyd J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic Impact Loads of a -20 Degree Dead-Rise Inverted-V Model and Comparisons With Loads of a Flat-Bottom Model

Description: Note presenting a model with an inverted-V transverse shape and a dead-rise angle of -20 degrees as part of a study of hydrodynamic impact loads on chine-immersed bodies. A series of fixed-trim impacts of the inverted-V model were made in smooth water over a wide range of trim and initial flight-path angles at a beam-loading coefficient of 19.15 with a few impacts at beam-loading coefficients of 27.90 and 36.07. The data are presented in tables and in figures as variations of loads and motions … more
Date: August 1958
Creator: Edge, Philip M., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Water-landing investigation of a flat-bottom v-step model and comparison with a theory incorporating planing data

Description: Report presenting testing of a flat-bottom V-step model with a beam loading of 4.6 subjected to fixed-trim impacts in smooth water. Testing occurred at three different trim angles and a range of initial flight-path angles. Data were obtained as time histories of draft, vertical velocity, and vertical acceleration. The results are presented as plots of nondimensional lift, draft, vertical velocity, and time against flight-path angle at contact.
Date: May 1953
Creator: Miller, Robert W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Planing Characteristics of a Surface Having a Basic Angle of Dead Rise of 20 Degrees and Horizontal Chine Flare

Description: Note presenting a study of the hydrodynamic characteristics obtained for a planing surface with a basic angle of dead rise of 20 degrees at the keel and horizontal chine flare. The wetted lengths, resistances, center-of-pressure locations, and drafts were determined at a range of speed coefficients, with the majority of the data obtained at Froude numbers in excess of 7.0.
Date: October 1952
Creator: Kapryan, Walter J. & Weinstein, Irving
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High-Speed Hydrodynamic Characteristics of a Flat Plate and 20 Degrees Dead-Rise Surface in Unsymmetrical Planing Conditions

Description: Note presenting the results of an investigation made to obtain the wetted areas, three components of planing forces, and the three components of moments acting on a 0 degree and a 20 degree dead-rise surface in high-speed, unsymmetrical planing conditions. The collected test data are presented in summary plots which are readily applicable for use in determining the lift, drag, side force, pitching moment, rolling moment, and yawing moment.
Date: June 1958
Creator: Savitsky, Daniel; Prowse, R. E. & Lueders, D. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of hydrodynamic-impact acceleration and response for systems with single and with multiple elastic modes

Description: Report presenting hydrodynamic impact testing made with a multimode elastic model consisting of a rigid prismatic float and a flexible wing and a comparison with similar experimental results for a single-mode system and with theoretical solutions. Testing was conducted in smooth water at two fixed trims and two flight-path angles over a range of velocities. Results regarding accelerations, time histories, oscillatory accelerations, elastic-body acceleration data, and rigid-body acceleration dat… more
Date: February 1958
Creator: Miller, Robert W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A method for calculation of hydrodynamic lift for submerged and planing rectangular lifting surfaces

Description: A method is presented for the calculation of lift coefficients for rectangular lifting surfaces of aspect ratios from 0.125 to 10 operating at finite depths beneath the water surface, including the zero depth or planing condition. Theoretical values are compared with experimental values obtained at various depths of submergence with lifting surfaces of aspect ratios from 0.125 to 10. The method can also be applied to hydrofoils with dihedral. Lift coefficients computed by this method are in goo… more
Date: January 1958
Creator: Wadlin, Kenneth L. & Christopher, Kenneth W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Planing Characteristics of Two v-Shaped Prismatic Surfaces Having Angles of Dead Rise of 20 Degrees and 40 Degrees

Description: "The principal planing characteristics have been obtained for two V-shaped prismatic surfaces having angles of dead rise of 20 degrees and 40 degrees. The load, wetted lengths, resistance, center-of-pressure location, and limited drag data are presented for speed coefficients up to 25.0, beam-loading coefficients from 0.85 to 87.33, keel-wetted-length-beam-ratios up to approximately 8.0, and trims up to 30 degrees. The data indicate that, for a given condition of load, speed, and trim, the wett… more
Date: January 1953
Creator: Chambliss, Derrill B. & Boyd, George M., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The hydrodynamic characteristics of modified rectangular flat plates having aspect ratios of 1.00 and 0.25 and operating near a free water surface

Description: Report presenting an investigation to determine the hydrodynamic forces and moments acting on modified rectangular flat plates with aspect ratios of 1.00 and 0.25 mounted on a single strut and operating at several depths of submersion. The experimental investigation indicated that decreasing the aspect ratio or depth of submersion caused a decrease in the lift coefficient, drag coefficient, and lift-drag ratio.
Date: March 1954
Creator: Wadlin, Kenneth L.; Ramsen, John A. & Vaughan, Victor L., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Hydrodynamic drag of 12- and 21-percent-thick surface-piercing struts

Description: Report presenting the hydrodynamic drag of three surface-piercing untapered struts at approximately 0 degrees angle of yaw at depths up to 6 chords for speeds up to 80 fps at various angles of rake. The section drag coefficient was determined from plots of drag against depth. Results regarding drag, spray, and cavitation and ventilation are provided.
Date: December 1953
Creator: Coffee, Claude W., Jr. & McKann, Robert E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of Forebody Warp and Increase in Afterbody Length on the Hydrodynamic Qualities of a Flying-Boat Hull of High Length-Beam Ratio

Description: Note presenting an investigation with the aim of achieving improved hydrodynamic qualities for flying boats, which involved determining the combined effect of a warped forebody and extended afterbody on the hydrodynamic characteristics of a full having a basic length-beam ratio of 15. Results regarding longitudinal stability, landing stability, spray characteristics, and landings in waves are provided.
Date: November 1949
Creator: Kapryan, Walter J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Landing characteristics in waves of three dynamic models of flying boats

Description: Powered models of three different flying boats were landed in oncoming waves of various heights and lengths. The effects of varying the trim at landing, the deceleration after landing, and the size of the waves were determined. Data are presented on the motions and accelerations obtained during landings in rough water.
Date: January 1952
Creator: Benson, James M.; Havens, Robert F. & Woodward, David R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of an Increase in Angle of Dead Rise on the Hydrodynamic Characteristics of a High-Length-Beam-Ratio Hull

Description: Report presenting an investigation in Langley tank no. 1 to determine the effects of increasing the angle of dead rise on various hydrodynamic qualities of a flying-boat hull with a length-beam ratio of 15. Results regarding the longitudinal stability, spray characteristics, take-off performance, rough-water landing characteristics, and a summary chart are provided.
Date: February 1951
Creator: Whitaker, Walter E., Jr. & Bryce, Paul W., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison of Pitching Moments Obtained During Seaplane Landings With Values Predicted by Hydrodynamic Impact Theory

Description: Report presenting an investigation of pitching moments and center-of-pressure locations obtained from a landing investigation in smooth water of a conventional flying boat as compared to values predicted by general hydrodynamic impact theory. Landings were generally moderate and covered as wide a range of trim and velocities as practical. Results regarding the center of pressure and pitching moments are provided.
Date: May 1949
Creator: Haines, Gilbert A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Tank investigation of a powered dynamic model of a large long-range flying boat - Langley tank model 180

Description: Report presenting an investigation of the principles for designing the optimum hull for a large long-range flying boat to meet the requirements of seaworthiness, minimum drag, and ability to take off and land at all operational gross loads. The aerodynamic and hydrodynamic qualities of the model were investigated in Langley tank no. 1.
Date: March 1947
Creator: Parkinson, John B.; Olson, Roland E. & Haar, Marvin I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A comparison of theoretical and experimental wing bending moments during seaplane landings

Description: Report presenting a smooth-water-landing investigation with a small seaplane to obtain experimental wing-bending-moment time histories together with time histories of the various parameters necessary for the prediction of wing bending moments during hydrodynamic impact. Experimental results were compared with calculated results, including inertia-load effects and the effects of air-load variation during impact.
Date: April 1950
Creator: Merten, Kenneth F.; RodrÍguez, José L. & Beck, Edgar B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Experimental Hydrodynamic Investigation of the Inception of Vortex Ventilation

Description: Results are presented from a hydrodynamic investigation of the inception of vortex ventilation on modified-flat-plate rectangular lifting surfaces of aspect ratio 0.25 differing in scale and thickness ratio. Two types of bubble-formation processes are described. Inception speeds were correlated for bubble formation in the high angle-of-attack range by using the Froude number and for that in the low angle-of-attack range by expressing the speed as a function of the thickness ratio.
Date: April 1957
Creator: Ramsen, John A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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